Description
In the Linux kernel, the following vulnerability has been resolved:
perf: Fix event leak upon exit
When a task is scheduled out, pending sigtrap deliveries are deferred
to the target task upon resume to userspace via task_work.
However failures while adding an event's callback to the task_work
engine are ignored. And since the last call for events exit happen
after task work is eventually closed, there is a small window during
which pending sigtrap can be queued though ignored, leaking the event
refcount addition such as in the following scenario:
TASK A
-----
do_exit()
exit_task_work(tsk);
<IRQ>
perf_event_overflow()
event->pending_sigtrap = pending_id;
irq_work_queue(&event->pending_irq);
</IRQ>
=========> PREEMPTION: TASK A -> TASK B
event_sched_out()
event->pending_sigtrap = 0;
atomic_long_inc_not_zero(&event->refcount)
// FAILS: task work has exited
task_work_add(&event->pending_task)
[...]
<IRQ WORK>
perf_pending_irq()
// early return: event->oncpu = -1
</IRQ WORK>
[...]
=========> TASK B -> TASK A
perf_event_exit_task(tsk)
perf_event_exit_event()
free_event()
WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1)
// leak event due to unexpected refcount == 2
As a result the event is never released while the task exits.
Fix this with appropriate task_work_add()'s error handling.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.15.84 – < 5.15.165, 6.0.14 – < 6.1, 6.1 | 5.15.165 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 6.10.3-1 | — |
| Debian 13 | linux | 6.10.3-1 | — |
| Debian 12 | linux | 6.1.106-1 | — |
| Debian 11 | linux-6.1 | 6.1.119-1~deb11u1 | DLA-4008-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1056.58 | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-50.51 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1020.22 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1020.23 | USN-7196-1 |
| Ubuntu 24.04 LTS | linux-gcp +1 | 6.8.0-1019.21 | USN-7155-1, USN-7154-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1015.19 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1002.4 | USN-7156-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1017.17 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1019.21.1 | USN-7155-1 |
| Ubuntu 24.04 LTS | linux-oem-6.8 | 6.8.0-1018.18 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-oracle +1 | 6.8.0-1017.18 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1016.18 | USN-7154-1 |
| Ubuntu 24.04 LTS | linux-riscv +1 | 6.8.0-50.51.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-125.135 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1072.78 | USN-7100-2 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1020.22~22.04.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1075.84 | USN-7123-1 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1020.23~22.04.1 | USN-7196-1 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1076.85.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1071.79 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 +1 | 6.8.0-1019.21~22.04.1 | USN-7155-1, USN-7154-1 |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1069.75 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1055.62 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-50.51~22.04.1 | USN-7154-2 |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1065.68 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1017.17~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1067.73 | USN-7144-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1069.74 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1067.68 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1032.32 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1020.20 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1070.76 | USN-7100-1 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1017.18~22.04.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux-riscv +31 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv-6.8 +1 | 6.8.0-50.51.1~22.04.1 | USN-7154-1 |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1038.42 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1072.78~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1078.87~20.04.1 | USN-7194-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1071.79~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1055.62~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-125.135~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1065.68~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1067.73~20.04.1 | USN-7144-1 |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1032.32~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1070.76~20.04.1 | USN-7100-1 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1068.72~20.04.1 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2015.16 | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1013.14 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1066.68 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1073.81 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1013.14~22.04.1 | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-78.78+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-aws-fips | 5.15.0-1072.78+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1075.84+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-125.135+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1071.79+fips1 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.4.0-503.11.1.el9_5 | RHSA-2024:9315 |
| RHEL 9 | rv +67 | 5.14.0-503.11.1.el9_5 | RHSA-2024:9315 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP6 | kernel-64kb +4 | 6.4.0-150600.23.25.1 | SUSE-SU-2024:3561-1 |
| SLES 15 SP6 | kernel-azure +2 | 6.4.0-150600.8.14.1 | SUSE-SU-2024:3551-1 |
| SLES 15 SP6 | kernel-coco +3 | 6.4.0-15061.6.coco15sp6.1 | SUSE-SU-2024:3553-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.25.1.150600.12.10.2 | SUSE-SU-2024:3561-1 |
| SLES 15 SP6 | kernel-docs +1 | 6.4.0-150600.23.25.2 | SUSE-SU-2024:3561-1 |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.0 | kernel-default-base | 6.4.0-17.1.1.51 | SUSE-SU-2025:20073-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0_Update_3 +1 | 1-1.2 | SUSE-SU-2025:20077-1, SUSE-SU-2025:20073-1 |
| SLE Micro 6.0 | kernel-rt +1 | 6.4.0-11.1 | SUSE-SU-2025:20077-1 |
| SLE Micro 6.0 | kernel-source +2 | 6.4.0-20.1 | SUSE-SU-2025:20073-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.25.1 | SUSE-SU-2024:3561-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_4 | 1-150600.1.3.1 | SUSE-SU-2024:3564-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_5 | 1-150600.13.3.1 | SUSE-SU-2024:3561-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.14.1 | SUSE-SU-2024:3564-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +8 | 6.4.0-150600.23.25.1 | SUSE-SU-2024:3561-1 |
| openSUSE Leap 15.6 | kernel-azure +2 | 6.4.0-150600.8.14.1 | SUSE-SU-2024:3551-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.25.1.150600.12.10.2 | SUSE-SU-2024:3561-1 |
| openSUSE Leap 15.6 | kernel-docs +1 | 6.4.0-150600.23.25.2 | SUSE-SU-2024:3561-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.14.1 | SUSE-SU-2024:3564-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.106-116.188 | 1.0-0.amzn2023 | ALAS2023-2025-864, ALAS2023-2024-709 |
| Amazon Linux 2023 | perf +14 | 6.1.106-116.188.amzn2023 | ALAS2023-2025-864, ALAS2023-2024-709 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | bpftool | 7.4.0-503.11.1.el9_5 | ELSA-2024-9315 |
| Oracle Linux 9 | rv +28 | 5.14.0-503.11.1.el9_5 | ELSA-2024-9315 |
| Oracle Linux 8 | bpftool +13 | 5.15.0-302.167.6.el9uek | ELSA-2024-12815 |
Advisories 24
- USN-7100-1 linux, linux-aws-5.15, linux-gcp, linux-gcp-5.15, linux-gke, linux-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-oracle-5.15, linux-raspi, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7154-1 linux, linux-aws, linux-aws-6.8, linux-gcp, linux-gcp-6.8, linux-gke, linux-ibm, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-oem-6.8, linux-oracle, linux-oracle-6.8, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7155-1 linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7144-1 linux-intel-iotg, linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7194-1 linux-azure-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7196-1 linux-azure, linux-azure-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7156-1 linux-gkeop vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7100-2 linux-aws vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7123-1 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- USN-7154-2 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 29, 2026
- RHSA-2024:9315 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 20, 2026
- WID-SEC-2024-1888 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- ALAS2023-2025-864 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 24, 2026
- SUSE-SU-2025:20073-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20077-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- DLA-4008-1 linux-6.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2024:3551-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3561-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3564-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2024:3553-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-1293 IBM DataPower Gateway: Mehrere Schwachstellen BSI CERT-Bund (WID) · Dec 3, 2025
- ALAS2023-2024-709 Moderate: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Dec 5, 2024
- ELSA-2024-9315 Moderate: kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Nov 14, 2024
- ELSA-2024-12815 Important: Unbreakable Enterprise kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 11, 2024
References
- https://git.kernel.org/stable/c/67fad724f1b568b356c1065d50df46e6b30eb2f7
- https://git.kernel.org/stable/c/70882d7fa74f0731492a0d493e8515a4f7131831
- https://git.kernel.org/stable/c/05d3fd599594abf79aad4484bccb2b26e1cb0b51
- https://git.kernel.org/stable/c/3d7a63352a93bdb8a1cdf29606bf617d3ac1c22a
- https://git.kernel.org/stable/c/2fd5ad3f310de22836cdacae919dd99d758a1f1b