CVE-2024-46704
Publication date 13 September 2024
Last updated 16 September 2024
Ubuntu priority
In the Linux kernel, the following vulnerability has been resolved: workqueue: Fix spruious data race in __flush_work() When flushing a work item for cancellation, __flush_work() knows that it exclusively owns the work item through its PENDING bit. 134874e2eee9 ("workqueue: Allow cancel_work_sync() and disable_work() from atomic contexts on BH work items") added a read of @work->data to determine whether to use busy wait for BH work items that are being canceled. While the read is safe when @from_cancel, @work->data was read before testing @from_cancel to simplify code structure: data = *work_data_bits(work); if (from_cancel && !WARN_ON_ONCE(data & WORK_STRUCT_PWQ) && (data & WORK_OFFQ_BH)) { While the read data was never used if !@from_cancel, this could trigger KCSAN data race detection spuriously: ================================================================== BUG: KCSAN: data-race in __flush_work / __flush_work write to 0xffff8881223aa3e8 of 8 bytes by task 3998 on cpu 0: instrument_write include/linux/instrumented.h:41 [inline] ___set_bit include/asm-generic/bitops/instrumented-non-atomic.h:28 [inline] insert_wq_barrier kernel/workqueue.c:3790 [inline] start_flush_work kernel/workqueue.c:4142 [inline] __flush_work+0x30b/0x570 kernel/workqueue.c:4178 flush_work kernel/workqueue.c:4229 [inline] ... read to 0xffff8881223aa3e8 of 8 bytes by task 50 on cpu 1: __flush_work+0x42a/0x570 kernel/workqueue.c:4188 flush_work kernel/workqueue.c:4229 [inline] flush_delayed_work+0x66/0x70 kernel/workqueue.c:4251 ... value changed: 0x0000000000400000 -> 0xffff88810006c00d Reorganize the code so that @from_cancel is tested before @work->data is accessed. The only problem is triggering KCSAN detection spuriously. This shouldn't need READ_ONCE() or other access qualifiers. No functional changes.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| linux | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
|
| linux-allwinner-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-aws | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
|
| linux-aws-5.0 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-aws-5.11 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-aws-5.13 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-aws-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-aws-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-aws-5.3 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-aws-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-aws-5.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-aws-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-aws-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-aws-fips | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-aws-hwe | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 16.04 LTS xenial |
Not affected
|
|
| linux-azure | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
|
| linux-azure-4.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-azure-5.11 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-azure-5.13 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-azure-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-azure-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-azure-5.3 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-azure-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-azure-5.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-azure-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-azure-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-azure-edge | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-azure-fde | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Ignored | |
| linux-azure-fde-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-azure-fde-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-azure-fde-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-azure-fips | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-bluefield | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-fips | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-gcp | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial |
Not affected
|
|
| linux-gcp-4.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-gcp-5.11 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-gcp-5.13 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-gcp-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-gcp-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-gcp-5.3 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-gcp-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-gcp-5.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-gcp-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-gcp-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-gcp-fips | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-gke | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Ignored | |
| linux-gke-4.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-gke-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-gke-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-gkeop | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| linux-gkeop-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-gkeop-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-hwe | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial |
Not affected
|
|
| linux-hwe-5.11 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-hwe-5.13 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-hwe-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-hwe-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-hwe-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-hwe-5.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-hwe-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-hwe-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-hwe-6.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-hwe-edge | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| 16.04 LTS xenial | Ignored | |
| linux-ibm | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| linux-ibm-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-ibm-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-intel | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Not in release | |
| 16.04 LTS xenial | Not in release | |
| 14.04 LTS trusty | Not in release | |
| linux-intel-5.13 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-intel-iot-realtime | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-intel-iotg | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-intel-iotg-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-iot | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-kvm | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| linux-lowlatency | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-lowlatency-hwe-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-lowlatency-hwe-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-lowlatency-hwe-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-lowlatency-hwe-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-lowlatency-hwe-6.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-lts-xenial | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 14.04 LTS trusty |
Not affected
|
|
| linux-nvidia | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-nvidia-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-nvidia-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-nvidia-6.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-nvidia-lowlatency | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-oem | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-oem-5.10 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-oem-5.13 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-oem-5.14 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-oem-5.17 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-oem-5.6 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-oem-6.0 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-oem-6.1 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-oem-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-oem-6.8 | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-oracle | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| 18.04 LTS bionic |
Not affected
|
|
| 16.04 LTS xenial |
Not affected
|
|
| linux-oracle-5.0 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-oracle-5.11 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-oracle-5.13 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-oracle-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-oracle-5.3 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic | Ignored | |
| linux-oracle-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-oracle-5.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-oracle-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-raspi | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|
|
| linux-raspi-5.4 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| 18.04 LTS bionic |
Not affected
|
|
| linux-raspi-realtime | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Not in release | |
| linux-raspi2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-realtime | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-riscv | 24.04 LTS noble |
Not affected
|
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Ignored | |
| linux-riscv-5.11 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-riscv-5.15 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal |
Not affected
|
|
| linux-riscv-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-riscv-5.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Not in release | |
| 20.04 LTS focal | Ignored | |
| linux-riscv-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-riscv-6.8 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal | Not in release | |
| linux-starfive-5.19 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-starfive-6.2 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-starfive-6.5 | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy | Ignored | |
| 20.04 LTS focal | Not in release | |
| linux-xilinx-zynqmp | 24.04 LTS noble | Not in release |
| 22.04 LTS jammy |
Not affected
|
|
| 20.04 LTS focal |
Not affected
|