Description
In the Linux kernel, the following vulnerability has been resolved:
ipv6/addrconf: fix a potential refcount underflow for idev
Now in addrconf_mod_rs_timer(), reference idev depends on whether
rs_timer is not pending. Then modify rs_timer timeout.
There is a time gap in [1], during which if the pending rs_timer
becomes not pending. It will miss to hold idev, but the rs_timer
is activated. Thus rs_timer callback function addrconf_rs_timer()
will be executed and put idev later without holding idev. A refcount
underflow issue for idev can be caused by this.
if (!timer_pending(&idev->rs_timer))
in6_dev_hold(idev);
<--------------[1]
mod_timer(&idev->rs_timer, jiffies + when);
To fix the issue, hold idev if mod_timer() return 0.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 3.10.105 – < 3.11, 3.11 | 3.11 |
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 | 6.4.11-1 | — |
| Debian 13 | linux | 6.4.11-1 | — |
| Debian 12 | linux | 6.1.52-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | 5.15.0-1027.29 | — |
| Ubuntu 24.04 LTS | linux-intel +9 | No fix yet | — |
| Ubuntu 22.04 LTS | linux | 5.15.0-86.96 | — |
| Ubuntu 22.04 LTS | linux-aws | 5.15.0-1047.52 | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1049.56 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1049.56.1 | — |
| Ubuntu 22.04 LTS | linux-gcp | 5.15.0-1044.52 | — |
| Ubuntu 22.04 LTS | linux-gke +1 | 5.15.0-1044.49 | — |
| Ubuntu 22.04 LTS | linux-gkeop | 5.15.0-1030.35 | — |
| Ubuntu 22.04 LTS | linux-ibm +1 | 5.15.0-1040.43 | — |
| Ubuntu 22.04 LTS | linux-intel-iotg | 5.15.0-1043.49 | — |
| Ubuntu 22.04 LTS | linux-lowlatency | 5.15.0-86.95 | — |
| Ubuntu 22.04 LTS | linux-nvidia | 5.15.0-1037.37 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra | 5.15.0-1018.18 | — |
| Ubuntu 22.04 LTS | linux-nvidia-tegra-igx | 5.15.0-1005.5 | — |
| Ubuntu 22.04 LTS | linux-oracle | 5.15.0-1045.51 | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-xilinx-zynqmp | 5.15.0-1025.29 | — |
| Ubuntu 20.04 LTS | linux | 5.4.0-166.183 | — |
| Ubuntu 20.04 LTS | linux-aws | 5.4.0-1113.123 | — |
| Ubuntu 20.04 LTS | linux-aws-5.15 | 5.15.0-1047.52~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-azure | 5.4.0-1119.126 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1049.56~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-bluefield | 5.4.0-1074.80 | — |
| Ubuntu 20.04 LTS | linux-gcp | 5.4.0-1117.126 | — |
| Ubuntu 20.04 LTS | linux-gcp-5.15 | 5.15.0-1044.52~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-hwe-5.15 | 5.15.0-86.96~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-ibm | 5.4.0-1060.65 | — |
| Ubuntu 20.04 LTS | linux-ibm-5.15 | 5.15.0-1040.43~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-intel-iotg-5.15 | 5.15.0-1043.49~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-iot | 5.4.0-1025.26 | — |
| Ubuntu 20.04 LTS | linux-kvm | 5.4.0-1102.108 | — |
| Ubuntu 20.04 LTS | linux-lowlatency-hwe-5.15 | 5.15.0-86.95~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-nvidia-tegra-5.15 | 5.15.0-1018.18~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-oracle | 5.4.0-1112.121 | — |
| Ubuntu 20.04 LTS | linux-oracle-5.15 | 5.15.0-1045.51~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-raspi | 5.4.0-1097.109 | — |
| Ubuntu 20.04 LTS | linux-riscv-5.15 | 5.15.0-1043.47~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-xilinx-zynqmp | 5.4.0-1033.37 | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 12 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 | 5.15.0-1040.42 | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime | 5.15.0-1048.54 | — |
| 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 20.04 LTS | linux-aws-fips | 5.4.0-1113.123+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-azure-fips | 5.4.0-1119.126+fips1 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips | 5.4.0-1088.97 | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-gcp-fips | 5.4.0-1117.126+fips1 | — |
| Ubuntu Pro FIPS-updates 18.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 16.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux +5 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 | 5.4.0-1113.123~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-azure-5.4 | 5.4.0-1119.126~18.04.2 | — |
| Ubuntu Pro 18.04 LTS | linux-gcp-5.4 | 5.4.0-1117.126~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-hwe-5.4 | 5.4.0-166.183~18.04.2 | — |
| Ubuntu Pro 18.04 LTS | linux-ibm-5.4 | 5.4.0-1060.65~18.04.1 | — |
| Ubuntu Pro 18.04 LTS | linux-oracle-5.4 | 5.4.0-1112.121~18.04.4 | — |
| Ubuntu Pro 18.04 LTS | linux-raspi-5.4 | 5.4.0-1097.109~18.04.2 | — |
| Ubuntu Pro 16.04 LTS | linux +7 | No fix yet | — |
| Ubuntu Pro 14.04 LTS | linux +3 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | kernel-64kb +6 | 6.4.0-150700.53.22.1 | SUSE-SU-2025:4057-1 |
| SLES 15 SP7 | kernel-azure +2 | 6.4.0-150700.20.18.1 | SUSE-SU-2025:4132-1 |
| SLES 15 SP7 | kernel-default-base | 6.4.0-150700.53.22.1.150700.17.15.1 | SUSE-SU-2025:4057-1 |
| SLES 15 SP6 | kernel-64kb +6 | 6.4.0-150600.23.73.1 | SUSE-SU-2025:03600-1 |
| SLES 15 SP6 | kernel-azure +2 | 6.4.0-150600.8.52.1 | SUSE-SU-2025:03634-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.73.1.150600.12.32.1 | SUSE-SU-2025:03600-1 |
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SLES 12 SP5 | kernel-syms +2 | 4.12.14-122.275.1 | SUSE-SU-2025:03614-1 |
Show 11 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SLES for SAP 15 SP5 | kernel-docs +4 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLE Micro 6.1 | kernel-default-base | 6.4.0-35.1.21.12 | SUSE-SU-2025:20861-1 |
| SLE Micro 6.1 | kernel-rt +1 | 6.4.0-37.1 | SUSE-SU-2025:20898-1 |
| SLE Micro 6.1 | kernel-source +2 | 6.4.0-35.1 | SUSE-SU-2025:20861-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-35.1.21.12 | SUSE-SU-2025:20851-1 |
| SLE Micro 6.0 | kernel-rt +1 | 6.4.0-37.1 | SUSE-SU-2025:20870-1 |
| SLE Micro 6.0 | kernel-source +2 | 6.4.0-35.1 | SUSE-SU-2025:20851-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.109.1 | SUSE-SU-2025:3761-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLE Live Patching 15 SP7 | kernel-default | 6.4.0-150700.53.22.1 | SUSE-SU-2025:4057-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_6 | 1-150700.1.3.1 | SUSE-SU-2025:4141-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_6 | 1-150700.15.3.1 | SUSE-SU-2025:4057-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.73.1 | SUSE-SU-2025:03600-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_16 | 1-150600.1.3.1 | SUSE-SU-2025:3751-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_16 | 1-150600.13.3.1 | SUSE-SU-2025:03600-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_31 | 1-150500.11.3.1 | SUSE-SU-2025:03615-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.275.1 | SUSE-SU-2025:03614-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_73 | 1-8.3.1 | SUSE-SU-2025:03614-1 |
| SLE HPC 15 SP5 | kernel-64kb +5 | 5.14.21-150500.55.124.1 | SUSE-SU-2025:03615-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.124.1.150500.6.59.1 | SUSE-SU-2025:03615-1 |
| SUSE Real Time Module 15 SP7 | kernel-rt +2 | 6.4.0-150700.7.22.1 | SUSE-SU-2025:4141-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.55.1 | SUSE-SU-2025:3751-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +10 | 6.4.0-150600.23.73.1 | SUSE-SU-2025:03600-1 |
| openSUSE Leap 15.6 | kernel-azure +2 | 6.4.0-150600.8.52.1 | SUSE-SU-2025:03634-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.73.1.150600.12.32.1 | SUSE-SU-2025:03600-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.55.1 | SUSE-SU-2025:3751-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.41-63.109 | 1.0-0.amzn2023 | ALAS2023-2023-299 |
| Amazon Linux 2023 | perf +12 | 6.1.41-63.109.amzn2023 | ALAS2023-2023-299 |
| Amazon Linux 2 | kernel-livepatch-4.14.322-244.536 | 1.0-0.amzn2 | ALAS2-2023-2268 |
| Amazon Linux 2 | perf +8 | 4.14.322-244.536.amzn2 | ALAS2-2023-2268 |
Advisories 17
- WID-SEC-2025-2053 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 9, 2026
- WID-SEC-2026-0349 Dell Avamar und NetWorker: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- SUSE-SU-2025:20851-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03634-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:4141-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20861-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20870-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:03600-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20898-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- ALAS2023-2023-299 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 11, 2026
- ALAS2-2023-2268 Important: kernel security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Feb 8, 2026
- SUSE-SU-2025:03615-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:3761-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:3751-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:03614-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4132-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:4057-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://git.kernel.org/stable/c/c6395e32935d35e6f935e7caf1c2dac5a95943b4
- https://git.kernel.org/stable/c/df62fdcd004afa72ecbed0e862ebb983acd3aa57
- https://git.kernel.org/stable/c/c7eeba47058532f6077d6a658e38b6698f6ae71a
- https://git.kernel.org/stable/c/2ad31ce40e8182860b631e37209e93e543790b7c
- https://git.kernel.org/stable/c/82abd1c37d3bf2a2658b34772c17a25a6f9cca42
- https://git.kernel.org/stable/c/436b7cc7eae7851c184b671ed7a4a64c750b86f7
- https://git.kernel.org/stable/c/1f656e483eb4733d62f18dfb206a49b78f60f495
- https://git.kernel.org/stable/c/06a0716949c22e2aefb648526580671197151acc