Description
In the Linux kernel, the following vulnerability has been resolved:
um: Add winch to winch_handlers before registering winch IRQ
Registering a winch IRQ is racy, an interrupt may occur before the winch is
added to the winch_handlers list.
If that happens, register_winch_irq() adds to that list a winch that is
scheduled to be (or has already been) freed, causing a panic later in
winch_cleanup().
Avoid the race by adding the winch to the winch_handlers list before
registering the IRQ, and rolling back if um_request_irq() fails.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 2.6.23 | 4.19.316 |
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 | 6.9.7-1 | — |
| Debian 13 | linux | 6.9.7-1 | — |
| Debian 12 | linux | 6.1.94-1 | — |
| Debian 11 | linux | 5.10.221-1 | DSA-5730-1 |
| Debian 10 | linux | 4.19.316-1 | DLA-3840-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1051.53 | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-41.41 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1014.15 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1013.15 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1013.14 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1009.12 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-ibm +2 | 6.8.0-1011.11 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1012.12 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1012.12.1 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1010.11 | USN-6975-1 |
| Ubuntu 24.04 LTS | linux-riscv +1 | 6.8.0-41.41.1 | USN-6975-1 |
| Ubuntu 22.04 LTS | linux +1 | 5.15.0-119.129 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1068.74 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1014.15~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1071.80 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1013.15~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1071.80.1 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1067.75 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1013.14~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-gke | 5.15.0-1065.71 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1051.58 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 | 6.8.0-45.45~22.04.1 | USN-7029-1 |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1061.64 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 +1 | 6.8.0-1011.11~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1063.69 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-kvm | 5.15.0-1065.70 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-44.44.1~22.04.1 | USN-7008-1 |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1063.64 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1012.12~22.04.1 | USN-6975-1 |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1028.28 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1016.16 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1066.72 | USN-6974-1 |
| Ubuntu 22.04 LTS | linux-riscv +31 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv-6.8 | 6.8.0-41.41.1~22.04.1 | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1035.39 | USN-7019-1 |
| Ubuntu 20.04 LTS | linux | 5.4.0-192.212 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1130.140 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1068.74~20.04.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1135.142 | USN-6951-2 |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1071.80~20.04.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-azure-fde-5.15 | 5.15.0-1071.80~20.04.1.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1090.97 | USN-6951-4 |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1134.143 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1067.75~20.04.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-gke +26 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gkeop | 5.4.0-1097.101 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-gkeop-5.15 | 5.15.0-1051.58~20.04.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-hwe-5.15 +1 | 5.15.0-119.129~20.04.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1077.82 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1061.64~20.04.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1063.69~20.04.1 | USN-6974-1 |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1042.43 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1118.125 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1030.30~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1129.138 | USN-6953-1 |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1066.72~20.04.1 | USN-6974-2 |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1114.126 | USN-6951-1 |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1064.68~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1049.53 | USN-6951-1 |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 15 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 | 6.8.0-2009.9 | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1007.7 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-intel-iot-realtime | 5.15.0-1061.63 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1069.77 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1007.7~22.04.1 | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS 16.04 LTS | linux-fips | No fix yet | — |
| 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 | 5.15.0-1068.74+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-azure-fips | 5.15.0-1071.80+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips | 5.15.0-119.129+fips1 | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-gcp-fips | 5.15.0-1067.75+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-aws-fips | 5.4.0-1130.140+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1135.142+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1104.114 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1134.143+fips1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-aws-fips | 4.15.0-2110.116 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-azure-fips | 4.15.0-2089.95 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips | 4.15.0-1126.137 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-gcp-fips | 4.15.0-2073.78 | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | 4.4.0-1104.111 | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux | 4.15.0-228.240 | USN-6972-1 |
| Ubuntu Pro 18.04 LTS | linux-aws | 4.15.0-1172.185 | USN-6972-2 |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1130.140~18.04.1 | USN-6951-1 |
| Ubuntu Pro 18.04 LTS | linux-azure-4.15 | 4.15.0-1180.195 | USN-6972-3 |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1135.142~18.04.1 | USN-6951-3 |
| Ubuntu Pro 18.04 LTS | linux-gcp-4.15 | 4.15.0-1165.182 | USN-6972-1 |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1134.143~18.04.1 | USN-6951-1 |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-192.212~18.04.1 | USN-6951-1 |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1077.82~18.04.1 | USN-6951-1 |
| Ubuntu Pro 18.04 LTS | linux-kvm | 4.15.0-1155.160 | USN-6972-1 |
| Ubuntu Pro 18.04 LTS | linux-oracle | 4.15.0-1134.145 | USN-6972-4 |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1129.138~18.04.1 | USN-6953-1 |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1114.126~18.04.1 | USN-6979-1 |
| Ubuntu Pro 16.04 LTS | linux | 4.4.0-258.292 | USN-6976-1 |
| Ubuntu Pro 16.04 LTS | linux-aws | 4.4.0-1173.188 | USN-6976-1 |
| Ubuntu Pro 16.04 LTS | linux-aws-hwe | 4.15.0-1172.185~16.04.1 | USN-6972-2 |
| Ubuntu Pro 16.04 LTS | linux-azure | 4.15.0-1180.195~16.04.1 | USN-6972-3 |
| Ubuntu Pro 16.04 LTS | linux-gcp | 4.15.0-1165.182~16.04.1 | USN-6972-1 |
| Ubuntu Pro 16.04 LTS | linux-hwe | 4.15.0-228.240~16.04.1 | USN-6972-1 |
| Ubuntu Pro 16.04 LTS | linux-kvm | 4.4.0-1136.146 | USN-6976-1 |
| Ubuntu Pro 16.04 LTS | linux-oracle | 4.15.0-1134.145~16.04.1 | USN-6972-4 |
| Ubuntu Pro 14.04 LTS | linux | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux-aws | 4.4.0-1135.141 | USN-6976-1 |
| Ubuntu Pro 14.04 LTS | linux-azure | 4.15.0-1180.195~14.04.1 | USN-6972-3 |
| Ubuntu Pro 14.04 LTS | linux-lts-xenial | 4.4.0-258.292~14.04.2 | USN-6976-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | 6.6.35.1-4 | — |
| Azure Linux 2 (CBL-Mariner) | kernel | 5.15.162.2-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | kernel-uek-container +1 | 5.4.17-2136.334.6.el8 | ELSA-2024-12584 |
| Oracle Linux 7 | kernel-uek-container +1 | 5.4.17-2136.334.6.el7 | ELSA-2024-12585 |
| Oracle Linux 7 | perf +10 | 4.14.35-2047.540.4.1.el7uek | ELSA-2024-12611, ELSA-2024-12581 |
Advisories 29
- USN-7029-1 linux-hwe-6.8 Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-7008-1 linux-lowlatency-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-7019-1 linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 26, 2026
- USN-6951-1 linux, linux-aws, linux-aws-5.4, linux-gcp, linux-gcp-5.4, linux-gkeop, linux-hwe-5.4, linux-ibm, linux-ibm-5.4, linux-iot, linux-kvm, linux-raspi, linux-xilinx-zynqmp vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6972-1 linux, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6975-1 linux, linux-aws, linux-azure, linux-gcp, linux-gke, linux-ibm, linux-lowlatency, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-oem-6.8, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6976-1 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6974-2 linux-oracle-5.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6979-1 linux-raspi-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6974-1 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-gkeop, linux-gkeop-5.15, linux-hwe-5.15, linux-ibm, linux-ibm-5.15, linux-intel-iotg, linux-intel-iotg-5.15, linux-kvm, linux-lowlatency, linux-lowlatency-hwe-5.15, linux-nvidia, linux-oracle, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6951-3 linux-azure-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6953-1 linux-oracle, linux-oracle-5.4 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6951-4 linux-bluefield vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6972-2 linux-aws, linux-aws-hwe vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6972-3 linux-azure, linux-azure-4.15 vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6951-2 linux-azure vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- USN-6972-4 linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 23, 2026
- SSA-398330 SSA-398330: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP >= V3.1.0 and < V3.1.5 Siemens ProductCERT · Oct 13, 2026
- DSA-5730-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3840-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- ICSA-25-226-15 Siemens SINEC OS CISA ICS & IT advisories · Feb 25, 2026
- SSA-613116 SSA-613116: Multiple Vulnerabilities in Third-Party Components in SINEC OS before V3.1 Siemens ProductCERT · Feb 24, 2026
- WID-SEC-2024-1443 Linux Kernel: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Feb 15, 2026
- ICSA-23-348-10 Siemens SIMATIC S7-1500 CISA ICS & IT advisories · Aug 12, 2025
- ELSA-2024-12611 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Sep 11, 2024
- NCSC-2024-0339 Kwetsbaarheden verholpen in Microsoft Mariner NCSC-NL (Netherlands) · Aug 13, 2024
- ELSA-2024-12584 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Aug 12, 2024
- ELSA-2024-12581 Important: Unbreakable Enterprise kernel security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 12, 2024
- ELSA-2024-12585 Important: Unbreakable Enterprise kernel-container security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Aug 12, 2024
References
- https://git.kernel.org/stable/c/66ea9a7c6824821476914bed21a476cd20094f33
- https://git.kernel.org/stable/c/dc1ff95602ee908fcd7d8acee7a0dadb61b1a0c0
- https://git.kernel.org/stable/c/351d1a64544944b44732f6a64ed65573b00b9e14
- https://git.kernel.org/stable/c/31960d991e43c8d6dc07245f19fc13398e90ead2
- https://git.kernel.org/stable/c/0c02d425a2fbe52643a5859a779db0329e7dddd4
- https://git.kernel.org/stable/c/434a06c38ee1217a8baa0dd7c37cc85d50138fb0
- https://git.kernel.org/stable/c/73b8e21f76c7dda4905655d2e2c17dc5a73b87f1
- https://git.kernel.org/stable/c/a0fbbd36c156b9f7b2276871d499c9943dfe5101