Description
A use-after-free vulnerability in the Linux Kernel io_uring subsystem can be exploited to achieve local privilege escalation.
Racing a io_uring cancel poll request with a linked timeout can cause a UAF in a hrtimer.
We recommend upgrading past commit ef7dfac51d8ed961b742218f526bd589f3900a59 (4716c73b188566865bdd79c3a6709696a224ac04 for 5.10 stable and 0e388fce7aec40992eadee654193cad345d62663 for 5.15 stable).
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Kernel | 5.13 – < 6.4, 5.10.162 – < 5.10.185 | 6.4 |
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 | 6.0.2-1 | — |
| Debian 13 | linux | 6.0.2-1 | — |
| Debian 12 | linux | 6.0.2-1 | — |
| Debian 11 | linux | 5.10.191-1 | DSA-5480-1 |
| Debian 10 | linux-5.10 | 5.10.197-1~deb10u1 | DLA-3623-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1021.23 | — |
| Ubuntu 24.04 LTS | linux-raspi-realtime | No fix yet | — |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-78.85 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1040.45 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-aws-5.19 | 5.19.0-1029.30~22.04.1 | USN-6260-1 |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1042.49 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1042.49.1 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1038.46 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-gcp-5.19 | 5.19.0-1030.32~22.04.1 | USN-6260-1 |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1038.43 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1024.29 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-hwe-5.19 | 5.19.0-50.50 | USN-6260-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.2 | 6.2.0-26.26~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1034.37 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1036.41 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-5.19 | 5.19.0-1030.30 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1029.29 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1016.16 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1002.2 | — |
| Ubuntu 22.04 LTS | linux-oem-6.0 | 6.0.0-1020.20 | USN-6248-1 |
| Ubuntu 22.04 LTS | linux-oem-6.1 | 6.1.0-1017.17 | USN-6249-1 |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1039.45 | USN-6246-1 |
| Ubuntu 22.04 LTS | linux-riscv +13 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1040.45~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1042.49~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1042.49~20.04.1.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1038.46~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-gke +24 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke-5.15 | 5.15.0-1038.43~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1024.29~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-78.85~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1036.41~20.04.1 | USN-6255-1 |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1016.16~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1039.45~20.04.1 | USN-6246-1 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1037.41~20.04.2 | — |
| Ubuntu 18.04 LTS | linux-gcp +13 | No fix yet | — |
Show 8 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 | 5.15.0-1035.37 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1042.47 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 22.04 LTS | linux | 5.15.0-177.187 | LSN-0097-1 |
| Ubuntu Pro 22.04 LTS | linux-aws | 5.15.0-1106.113 | LSN-0097-1 |
| Ubuntu Pro 22.04 LTS | linux-aws-6.2 | 6.2.0-1008.8~22.04.1 | LSN-0097-1 |
| Ubuntu Pro 22.04 LTS | linux-azure | 5.15.0-1111.120 | LSN-0097-1 |
| Ubuntu Pro 22.04 LTS | linux-gcp | 5.15.0-1106.115 | LSN-0097-1 |
| Ubuntu Pro 22.04 LTS | linux-gke | 5.15.0-1102.108 | LSN-0097-1 |
| Ubuntu Pro 22.04 LTS | linux-ibm | 5.15.0-1100.103 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux | 5.4.0-155.172 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-aws | 5.4.0-1106.114 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-aws-5.15 | 5.15.0-1106.113~20.04.1 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-azure | 5.4.0-1112.118 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp | 5.4.0-1109.118 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-gcp-5.15 | 5.15.0-1106.115~20.04.1 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-gke | 5.4.0-1104.111 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-gke-5.15 | 5.15.0-1038.43~20.04.1 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-gkeop | 5.4.0-1073.77 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-177.187~20.04.1 | LSN-0097-1 |
| Ubuntu Pro 20.04 LTS | linux-ibm | 5.4.0-1053.58 | LSN-0097-1 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1106.114~18.04.1 | LSN-0097-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1112.118~18.04.1 | LSN-0097-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1109.118~18.04.1 | LSN-0097-1 |
| Ubuntu Pro 18.04 LTS | linux-gke-5.4 +1 | No fix yet | LSN-0097-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-155.172~18.04.1 | LSN-0097-1 |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1053.58~18.04.1 | LSN-0097-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-243.277 | LSN-0097-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1159.174 | LSN-0097-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1159.172~16.04.1 | LSN-0097-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-214.225~16.04.1 | LSN-0097-1 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-243.277~14.04.1 | LSN-0097-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.7.1 | SUSE-SU-2023:2871-1 |
| SLES 15 SP5 | kernel-azure +2 | 5.14.21-150500.33.6.1 | SUSE-SU-2023:2892-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.7.1.150500.6.2.5 | SUSE-SU-2023:2871-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.69.1 | SUSE-SU-2023:2820-1 |
| SLES 15 SP4 | kernel-azure +2 | 5.14.21-150400.14.55.1 | SUSE-SU-2023:2831-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.69.1.150400.24.31.1 | SUSE-SU-2023:2820-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.69.1 | SUSE-SU-2023:2820-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.69.1.150400.24.31.1 | SUSE-SU-2023:2820-1 |
| SLE Micro 5.4 | kernel-rt | 5.14.21-150400.15.40.1 | SUSE-SU-2023:2803-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.69.1 | SUSE-SU-2023:2820-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.69.1.150400.24.31.1 | SUSE-SU-2023:2820-1 |
| SLE Micro 5.3 | kernel-rt | 5.14.21-150400.15.40.1 | SUSE-SU-2023:2803-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.7.1 | SUSE-SU-2023:2871-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5-RT_Update_3 | 1-150500.11.5.1 | SUSE-SU-2023:3302-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_1 | 1-150500.11.7.1 | SUSE-SU-2023:2871-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.69.1 | SUSE-SU-2023:2820-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4-RT_Update_9 | 1-150400.1.3.1 | SUSE-SU-2023:2803-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_14 | 1-150400.9.3.1 | SUSE-SU-2023:2820-1 |
| SUSE Real Time Module 15 SP5 | kernel-rt +3 | 5.14.21-150500.13.11.1 | SUSE-SU-2023:3302-1 |
| SUSE Real Time Module 15 SP4 | kernel-rt +3 | 5.14.21-150400.15.40.1 | SUSE-SU-2023:2803-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.5 | dtb-aarch64 +10 | 5.14.21-150500.55.7.1 | SUSE-SU-2023:2871-1 |
| openSUSE Leap 15.5 | kernel-azure +2 | 5.14.21-150500.33.6.1 | SUSE-SU-2023:2892-1 |
| openSUSE Leap 15.5 | kernel-default-base | 5.14.21-150500.55.7.1.150500.6.2.5 | SUSE-SU-2023:2871-1 |
| openSUSE Leap 15.5 | kernel-rt +3 | 5.14.21-150500.13.11.1 | SUSE-SU-2023:3302-1 |
| openSUSE Leap 15.4 | dtb-aarch64 +10 | 5.14.21-150400.24.69.1 | SUSE-SU-2023:2820-1 |
| openSUSE Leap 15.4 | kernel-azure +2 | 5.14.21-150400.14.55.1 | SUSE-SU-2023:2831-1 |
| openSUSE Leap 15.4 | kernel-default-base | 5.14.21-150400.24.69.1.150400.24.31.1 | SUSE-SU-2023:2820-1 |
| openSUSE Leap 15.4 | kernel-rt +3 | 5.14.21-150400.15.40.1 | SUSE-SU-2023:2803-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap Micro 5.3 | kernel-default | 5.14.21-150400.24.69.1 | SUSE-SU-2023:2820-1 |
| openSUSE Leap Micro 5.3 | kernel-default-base | 5.14.21-150400.24.69.1.150400.24.31.1 | SUSE-SU-2023:2820-1 |
| openSUSE Leap Micro 5.3 | kernel-rt | 5.14.21-150400.15.40.1 | SUSE-SU-2023:2803-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 2 (CBL-Mariner) | hyperv-daemons | 5.15.135.1-1 | — |
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.122.1-2 | — |
Advisories 17
- USN-6260-1 linux-aws-5.19, linux-gcp-5.19, linux-hwe-5.19 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-6255-1 linux-intel-iotg-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-6246-1 linux, linux-aws, linux-aws-5.15, linux-azure, linux-azure-5.15, linux-azure-fde, linux-azure-fde-5.15, linux-gcp, linux-gcp-5.15, linux-gke, linux-gke-5.15, linux-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-intel-iotg, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-oracle-5.15, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- USN-6248-1 linux-oem-6.0 vulnerabilities Ubuntu Security Notices (USN) · Oct 22, 2026
- SSA-794697 SSA-794697: Vulnerabilities in the Additional GNU/Linux Subsystem of the SIMATIC S7-1500 TM MFP Before V1.1 Siemens ProductCERT · Oct 13, 2026
- USN-6249-1 linux-oem-6.1 vulnerabilities Ubuntu Security Notices (USN) · Jun 3, 2026
- LSN-0097-1 Kernel Live Patch Security Notice Ubuntu Security Notices (USN) · Jun 3, 2026
- DSA-5480-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3623-1 linux-5.10 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2023:2831-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2871-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2820-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2803-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:3302-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2023:2892-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-1595 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 18, 2024
- ICSA-23-166-11 Siemens SIMATIC S7-1500 TM MFP Linux Kernel CISA ICS & IT advisories · Apr 9, 2024
References
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.15.y&id=0e388fce7aec40992eadee654193cad345d62663 patch
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?h=linux-5.10.y&id=4716c73b188566865bdd79c3a6709696a224ac04 patch
- https://kernel.dance/0e388fce7aec40992eadee654193cad345d62663
- https://kernel.dance/4716c73b188566865bdd79c3a6709696a224ac04
- https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef7dfac51d8ed961b742218f526bd589f3900a59 patch
- https://kernel.dance/ef7dfac51d8ed961b742218f526bd589f3900a59
- https://security.netapp.com/advisory/ntap-20230731-0001/
- https://www.debian.org/security/2023/dsa-5480
- http://packetstormsecurity.com/files/174577/Kernel-Live-Patch-Security-Notice-LSN-0097-1.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html