Description
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
mtk_free_dev() calls metadata_dst_free() which frees the metadata_dst
with kfree() immediately, bypassing the RCU grace period.
In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from
the skb to the metadata_dst. This function requires RCU read-side
protection and the dst must remain valid until all RCU readers complete.
Since metadata_dst_free() calls kfree() directly, a use-after-free can
occur if any skb still holds a noref pointer to the dst when the driver
tears it down.
Replace metadata_dst_free() with dst_release() which properly goes
through the refcount path: when the refcount drops to zero, it schedules
the actual free via call_rcu_hurry(), ensuring all RCU readers have
completed before the memory is freed.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 6.2 | 6.6.143 |
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 | 7.0.13-1 | — |
| Debian 13 | linux | 6.12.94-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 24.04 LTS | linux-bluefield | 6.8.0-1029.34 | — |
| Ubuntu 26.04 LTS | linux | 7.0.0-29.29 | USN-8629-1 |
| Ubuntu 26.04 LTS | linux-aws +3 | 7.0.0-1010.10 | USN-8660-1, USN-8637-1, USN-8629-1 |
| Ubuntu 26.04 LTS | linux-gke | 7.0.0-1005.6 | USN-8660-1 |
| Ubuntu 26.04 LTS | linux-ibm +1 | 7.0.0-1011.11 | USN-8629-1 |
| Ubuntu 26.04 LTS | linux-nvidia-bos | 7.0.0-2016.16 | USN-8664-1 |
| Ubuntu 26.04 LTS | linux-oracle | 7.0.0-1009.9 | USN-8629-1 |
| Ubuntu 26.04 LTS | linux-raspi +1 | 7.0.0-1016.16 | USN-8663-1, USN-8629-1 |
| Ubuntu 26.04 LTS | linux-riscv +1 | 7.0.0-29.29.1 | USN-8629-1 |
| Ubuntu 25.10 | linux +8 | No fix yet | — |
| Ubuntu 24.04 LTS | linux | 6.8.0-138.138 | USN-8643-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1063.66 | USN-8643-1 |
| Ubuntu 24.04 LTS | linux-aws-7.0 | 7.0.0-1010.10~24.04.1 | USN-8629-2 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1065.73 | USN-8643-1 |
| Ubuntu 24.04 LTS | linux-azure-7.0 | 7.0.0-1014.14~24.04.1 | USN-8728-2 |
| Ubuntu 24.04 LTS | linux-azure-fde | 6.8.0-1064.71 | USN-8643-4 |
| Ubuntu 24.04 LTS | linux-azure-fde-7.0 | 7.0.0-1013.13~24.04.1 | — |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1066.74 | USN-8643-1 |
| Ubuntu 24.04 LTS | linux-gcp-7.0 +1 | 7.0.0-1011.11~24.04.1 | USN-8728-3, USN-8728-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1061.69 | USN-8643-2 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1048.52 | USN-8643-1 |
| Ubuntu 24.04 LTS | linux-hwe-7.0 | 7.0.0-29.29~24.04.2 | USN-8629-3 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1063.64 | USN-8643-5 |
| Ubuntu 24.04 LTS | linux-lowlatency | 6.8.0-138.138.1 | USN-8643-2 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1061.64 | USN-8643-3 |
| Ubuntu 24.04 LTS | linux-nvidia-6.17 | 6.17.0-1032.32 | USN-8748-1 |
| Ubuntu 24.04 LTS | linux-nvidia-7.0 | 7.0.0-1016.16~24.04.1 | USN-8663-1 |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1061.64.1 | USN-8643-3 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1032.34 | USN-8643-4 |
| Ubuntu 24.04 LTS | linux-oem-6.17 | 6.17.0-1033.33 | USN-8911-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1060.63 | USN-8643-1 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1063.67 | USN-8643-5 |
| Ubuntu 24.04 LTS | linux-riscv +26 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-riscv-7.0 | 7.0.0-30.30.1~24.04.1 | — |
| Ubuntu 24.04 LTS | linux-vmware | 6.8.0-1008.8 | — |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1035.36 | USN-8643-1 |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1063.66~22.04.1 | USN-8643-4 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1065.73~22.04.1 | USN-8643-5 |
| Ubuntu 22.04 LTS | linux-azure-fde-6.8 | 6.8.0-1064.71~22.04.1 | USN-8643-4 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1066.74~22.04.1 | USN-8643-1 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 +1 | 6.8.0-138.138~22.04.1 | USN-8656-1 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1063.64~22.04.1 | USN-8643-5 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-138.138.1~22.04.1 | USN-8643-2 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1061.64~22.04.1 | USN-8643-3 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1060.63~22.04.1 | USN-8643-5 |
| Ubuntu 22.04 LTS | linux-riscv +32 | No fix yet | — |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
| Ubuntu 18.04 LTS | linux-gcp +14 | No fix yet | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2052.54 | USN-8643-5 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1058.59 | USN-8643-1 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime-6.14 +1 | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1058.59~22.04.1 | USN-8643-1 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-aws-fips | 6.8.0-1063.66+fips1 | USN-8643-1 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-azure-fips | 6.8.0-1065.73+fips1 | USN-8643-4 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-138.138+fips1 | USN-8643-1 |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-gcp-fips | 6.8.0-1066.74+fips1 | USN-8643-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | kernel-64kb +8 | 6.12.0-160000.37.1 | SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLES for SAP 16.0 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLES 16.0 | kernel-64kb +8 | 6.12.0-160000.37.1 | SUSE-SU-2026:23237-1, SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLES 16.0 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23231-1, SUSE-SU-2026:23221-1 |
| SLE Micro 6.2 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | SUSE-SU-2026:23068-1 |
| SLE Micro 6.2 | kernel-rt +5 | 6.12.0-160000.37.1 | SUSE-SU-2026:23068-1, SUSE-SU-2026:23066-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 16.0 | kernel-default-base | 6.12.0-160000.37.1.160000.2.19 | openSUSE-SU-2026:21555-1 |
| openSUSE Leap 16.0 | kernel-rt +11 | 6.12.0-160000.37.1 | openSUSE-SU-2026:21555-1 |
Advisories 25
- WID-SEC-2026-2077 Linux Kernel: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- USN-8728-1 linux-gcp-7.0 vulnerabilities Ubuntu Security Notices (USN) · Nov 12, 2026
- USN-8728-2 linux-azure-7.0 vulnerabilities Ubuntu Security Notices (USN) · Nov 12, 2026
- USN-8728-3 linux-oracle-7.0 vulnerabilities Ubuntu Security Notices (USN) · Nov 12, 2026
- USN-8911-1 linux-oem-6.17 vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- USN-8664-1 linux-nvidia-bos vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- USN-8663-1 linux-nvidia, linux-nvidia-7.0 vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- USN-8643-1 linux, linux-aws, linux-aws-fips, linux-azure, linux-fips, linux-gcp, linux-gcp-6.8, linux-gcp-fips, linux-gkeop, linux-oracle, linux-realtime, linux-realtime-6.8, linux-xilinx vulnerabilities Ubuntu Security Notices (USN) · Oct 8, 2026
- USN-8637-1 linux-oem-7.0 vulnerabilities Ubuntu Security Notices (USN) · Sep 11, 2026
- USN-8656-1 linux-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Sep 11, 2026
- USN-8660-1 linux-gcp, linux-gke vulnerabilities Ubuntu Security Notices (USN) · Sep 11, 2026
- USN-8629-1 linux, linux-aws, linux-azure, linux-azure-fde, linux-ibm, linux-oracle, linux-raspi, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Sep 11, 2026
- USN-8629-2 linux-aws-7.0 vulnerabilities Ubuntu Security Notices (USN) · Sep 11, 2026
- USN-8629-3 linux-hwe-7.0 vulnerabilities Ubuntu Security Notices (USN) · Sep 11, 2026
- USN-8748-1 linux-nvidia-6.17 vulnerabilities Ubuntu Security Notices (USN) · Sep 10, 2026
- USN-8643-5 linux-azure-6.8, linux-ibm, linux-ibm-6.8, linux-oracle-6.8, linux-raspi, linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Aug 31, 2026
- SUSE-SU-2026:23237-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23231-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 27, 2026
- SUSE-SU-2026:23221-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 27, 2026
- USN-8643-4 linux-aws-6.8, linux-azure-fde, linux-azure-fde-6.8, linux-azure-fips, linux-nvidia-tegra vulnerabilities Ubuntu Security Notices (USN) · Aug 26, 2026
- USN-8643-3 linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency vulnerabilities Ubuntu Security Notices (USN) · Aug 22, 2026
- USN-8643-2 linux-gke, linux-lowlatency, linux-lowlatency-hwe-6.8 vulnerabilities Ubuntu Security Notices (USN) · Aug 21, 2026
- SUSE-SU-2026:23066-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 15, 2026
- SUSE-SU-2026:23068-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 15, 2026
- openSUSE-SU-2026:21555-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Aug 12, 2026
References
- https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4
- https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e
- https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3
- https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1
- https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751