Description
In the Linux kernel, the following vulnerability has been resolved:
net: shaper: protect late read accesses to the hierarchy
We look up a netdev during prep of Netlink ops (pre- callbacks)
and take a ref to it. Then later in the body of the callback
we take its lock or RCU which are the actual protections.
This is not proper, a conversion from a ref to a locked netdev
must include a liveness check (a check if the netdev hasn't been
unregistered already). Fix the read cases (those under RCU).
Writes needs a separate change to protect from creating the
hierarchy after flush has already run.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 6.13 | 6.18.20 |
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 | 6.19.10-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | linux +8 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-riscv +26 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
Show 2 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-realtime-6.14 +1 | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | kernel-livepatch-SLE16_Update_8 | 3-160000.1.1 | SUSE-SU-2026:22034-1 |
| SLES for SAP 16.0 | kernel-livepatch-SLE16_Update_9 +2 | 2-160000.1.1 | SUSE-SU-2026:22037-1, SUSE-SU-2026:22036-1, SUSE-SU-2026:22029-1 |
| SLES 16.0 | kernel-livepatch-SLE16_Update_8 | 3-160000.1.1 | SUSE-SU-2026:22034-1 |
| SLES 16.0 | kernel-livepatch-SLE16_Update_9 +2 | 2-160000.1.1 | SUSE-SU-2026:22037-1, SUSE-SU-2026:22036-1, SUSE-SU-2026:22029-1 |
| SLE Micro 6.2 | kernel-syms +1 | 6.12.0-160000.33.1 | SUSE-SU-2026:21834-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.18.20-20.229 | 1:1.0-0.amzn2023 | ALAS2023-2026-1596 |
| Amazon Linux 2023 | perf6.18 +14 | 1:6.18.20-20.229.amzn2023 | ALAS2023-2026-1596 |
Advisories 7
- WID-SEC-2026-0985 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- SUSE-SU-2026:21834-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Jul 9, 2026
- ALAS2023-2026-1596 Important: kernel6.18 security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 16, 2026
- SUSE-SU-2026:22034-1 Security update for the Linux Kernel (Live Patch 8 for SUSE Linux Enterprise 16) SUSE / openSUSE Security Updates · Jun 9, 2026
- SUSE-SU-2026:22037-1 Security update for the Linux Kernel (Live Patch 10 for SUSE Linux Enterprise 16) SUSE / openSUSE Security Updates · Jun 9, 2026
- SUSE-SU-2026:22029-1 Security update for the Linux Kernel (Live Patch 9 for SUSE Linux Enterprise 16) SUSE / openSUSE Security Updates · Jun 9, 2026
- SUSE-SU-2026:22036-1 Security update for the Linux Kernel (Live Patch 11 for SUSE Linux Enterprise 16) SUSE / openSUSE Security Updates · Jun 9, 2026