Description
A use-after-free flaw was found in io_uring/poll.c in io_poll_check_events in the io_uring subcomponent in the Linux Kernel due to a race condition of poll_refs. This flaw may cause a NULL pointer dereference.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Kernel | Linux Kernel prior to Kernel 6.1 RC7 | — |
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 | 6.0.12-1 | — |
| Debian 13 | linux | 6.0.12-1 | — |
| Debian 12 | linux | 6.0.12-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1014.16 | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-67.74 | USN-5912-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1031.35 | USN-5912-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1034.41 | USN-5912-1 |
| Ubuntu 22.04 LTS | linux-azure-5.19 | 5.19.0-1023.24~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1034.41.1 | USN-5912-1 |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1030.37 | USN-5912-1 |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1028.33 | USN-5912-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1016.21 | USN-5938-1 |
| Ubuntu 22.04 LTS | linux-hwe-5.19 | 5.19.0-40.41~22.04.1 | USN-6024-1 |
| Ubuntu 22.04 LTS | linux-ibm | 5.15.0-1026.29 | USN-5935-1 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1026.31 | USN-5962-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1029.34 | USN-5941-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-5.19 | 5.19.0-1022.23~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1023.23 | — |
| Ubuntu 22.04 LTS | linux-oem-5.17 | 5.17.0-1031.32 | USN-6071-1 |
| Ubuntu 22.04 LTS | linux-oem-6.0 | 6.0.0-1015.15 | USN-6072-1 |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1030.36 | USN-5912-1 |
| Ubuntu 22.04 LTS | linux-raspi | 5.15.0-1025.27 | USN-5935-1 |
| Ubuntu 22.04 LTS | linux-riscv +1 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1031.35~20.04.1 | USN-5912-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1034.41~20.04.1 | USN-5912-1 |
| Ubuntu 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1034.41~20.04.1.2 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1030.37~20.04.1 | USN-5912-1 |
| Ubuntu 20.04 LTS | linux-gke-5.15 | 5.15.0-1028.33~20.04.1 | USN-5912-1 |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1016.21~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-67.74~20.04.1 | USN-5912-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1026.31~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1030.36~20.04.1 | USN-5912-1 |
| Ubuntu 20.04 LTS | linux-riscv +22 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1030.34~20.04.1 | — |
| 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 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1022.27 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1033.36 | — |
| Ubuntu Pro 22.04 LTS | linux | 5.15.0-70.77 | LSN-0094-1 |
| Ubuntu Pro 22.04 LTS | linux-aws | 5.15.0-1034.38 | LSN-0094-1 |
| Ubuntu Pro 22.04 LTS | linux-azure | 5.15.0-1036.43 | LSN-0094-1 |
| Ubuntu Pro 22.04 LTS | linux-gcp | 5.15.0-1032.40 | LSN-0094-1 |
| Ubuntu Pro 22.04 LTS | linux-gke | 5.15.0-1031.36 | LSN-0094-1 |
| Ubuntu Pro 22.04 LTS | linux-ibm | 5.15.0-1028.31 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux | 5.4.0-147.164 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-aws | 5.4.0-1100.108 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-aws-5.15 | 5.15.0-1034.38~20.04.1 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-azure | 5.4.0-1106.112 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp | 5.4.0-1103.112 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp-5.15 | 5.15.0-1032.40~20.04.1 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-gke | 5.4.0-1097.104 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-gke-5.15 | 5.15.0-1031.36~20.04.1 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-gkeop | 5.4.0-1067.71 | LSN-0094-1 |
| Ubuntu Pro 20.04 LTS | linux-ibm | 5.4.0-1047.52 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-209.220 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1154.167 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1100.108~18.04.1 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1163.178 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1106.112~18.04.1 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1148.164 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1103.112~18.04.1 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-147.164~18.04.1 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1047.52~18.04.1 | LSN-0094-1 |
| Ubuntu Pro 18.04 LTS | linux-oem +3 | No fix yet | LSN-0094-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1154.167~16.04.1 | LSN-0094-1 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1163.178~16.04.1 | LSN-0094-1 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1148.164~16.04.1 | LSN-0094-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-209.220~16.04.1 | LSN-0094-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | kernel-livepatch-4.14.299-223.520 | 1.0-0.amzn2 | ALAS2-2022-1888 |
| Amazon Linux 2 | perf +8 | 4.14.299-223.520.amzn2 | ALAS2-2022-1888 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.92.1-1 | — |
Advisories 11
- USN-5935-1 linux-ibm, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-5938-1 linux-gkeop vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-5941-1 linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-5962-1 linux-intel-iotg vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-5912-1 linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15, linux-azure-fde, linux-gcp, linux-gcp-5.15, linux-gke, linux-gke-5.15, linux-hwe-5.15, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-oracle, linux-oracle-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6024-1 linux, linux-aws, linux-azure, linux-gcp, linux-hwe-5.19, linux-kvm, linux-lowlatency, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-6071-1 linux-oem-5.17 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-6072-1 linux-oem-6.0 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- LSN-0094-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- ALAS2-2022-1888 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Dec 19, 2025
- WID-SEC-2023-0196 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Feb 27, 2024