Description
In the Linux kernel, the following vulnerability has been resolved:
tcp: drop secpath at the same time as we currently drop dst
Xiumei reported hitting the WARN in xfrm6_tunnel_net_exit while
running tests that boil down to:
- create a pair of netns
- run a basic TCP test over ipcomp6
- delete the pair of netns
The xfrm_state found on spi_byaddr was not deleted at the time we
delete the netns, because we still have a reference on it. This
lingering reference comes from a secpath (which holds a ref on the
xfrm_state), which is still attached to an skb. This skb is not
leaked, it ends up on sk_receive_queue and then gets defer-free'd by
skb_attempt_defer_free.
The problem happens when we defer freeing an skb (push it on one CPU's
defer_list), and don't flush that list before the netns is deleted. In
that case, we still have a reference on the xfrm_state that we don't
expect at this point.
We already drop the skb's dst in the TCP receive path when it's no
longer needed, so let's also drop the secpath. At this point,
tcp_filter has already called into the LSM hooks that may require the
secpath, so it should not be needed anymore. However, in some of those
places, the MPTCP extension has just been attached to the skb, so we
cannot simply drop all extensions.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.19 | 6.1.130 |
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 | 6.12.17-1 | — |
| Debian 13 | linux | 6.12.17-1 | — |
| Debian 12 | linux | 6.1.133-1 | DSA-5900-1 |
| Debian 11 | linux-6.1 | 6.1.137-1~deb11u1 | DLA-4193-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 24.04 LTS | linux | 6.8.0-78.78 | USN-7703-1 |
| Ubuntu 24.04 LTS | linux-aws | 6.8.0-1035.37 | USN-7703-1 |
| Ubuntu 24.04 LTS | linux-azure | 6.8.0-1034.39 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-azure-nvidia | 6.8.0-1022.23 | USN-7737-1 |
| Ubuntu 24.04 LTS | linux-gcp | 6.8.0-1036.38 | USN-7703-2 |
| Ubuntu 24.04 LTS | linux-gcp-6.11 +1 | 6.11.0-1015.15~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-gke | 6.8.0-1032.36 | USN-7703-4 |
| Ubuntu 24.04 LTS | linux-gkeop | 6.8.0-1019.21 | USN-7703-2 |
| Ubuntu 24.04 LTS | linux-hwe-6.11 | 6.11.0-26.26~24.04.1 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-ibm | 6.8.0-1033.33 | USN-7703-2 |
| Ubuntu 24.04 LTS | linux-intel +4 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-lowlatency | 6.8.0-78.78.1 | USN-7703-1 |
| Ubuntu 24.04 LTS | linux-lowlatency-hwe-6.11 | 6.11.0-1014.15~24.04.1 | USN-7521-3 |
| Ubuntu 24.04 LTS | linux-nvidia | 6.8.0-1035.38 | USN-7703-4 |
| Ubuntu 24.04 LTS | linux-nvidia-6.11 | 6.11.0-1010.10 | — |
| Ubuntu 24.04 LTS | linux-nvidia-lowlatency | 6.8.0-1035.38.1 | USN-7703-4 |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1009.9 | — |
| Ubuntu 24.04 LTS | linux-oem-6.11 | 6.11.0-1022.22 | USN-7521-1 |
| Ubuntu 24.04 LTS | linux-oracle | 6.8.0-1032.33 | USN-7703-3 |
| Ubuntu 24.04 LTS | linux-raspi | 6.8.0-1035.39 | USN-7703-4 |
| Ubuntu 24.04 LTS | linux-xilinx | 6.8.0-1017.18 | — |
| Ubuntu 22.04 LTS | linux-aws-6.8 | 6.8.0-1035.37~22.04.1 | USN-7703-2 |
| Ubuntu 22.04 LTS | linux-azure-6.8 | 6.8.0-1034.39~22.04.1 | USN-7737-1 |
| Ubuntu 22.04 LTS | linux-gcp-6.8 | 6.8.0-1036.38~22.04.1 | USN-7703-2 |
| Ubuntu 22.04 LTS | linux-hwe-6.8 +1 | 6.8.0-78.78~22.04.1 | USN-7703-4 |
| Ubuntu 22.04 LTS | linux-ibm-6.8 | 6.8.0-1033.33~22.04.1 | USN-7703-2 |
| Ubuntu 22.04 LTS | linux-lowlatency-hwe-6.8 | 6.8.0-78.78.1~22.04.1 | USN-7703-1 |
| Ubuntu 22.04 LTS | linux-nvidia-6.8 | 6.8.0-1035.38~22.04.1 | USN-7703-4 |
| Ubuntu 22.04 LTS | linux-oracle-6.8 | 6.8.0-1032.33~22.04.1 | USN-7703-3 |
| 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 | — |
| Ubuntu 16.04 LTS | linux-hwe-edge | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro Realtime 24.04 LTS | linux-raspi-realtime | 6.8.0-2028.29 | USN-7719-1 |
| Ubuntu Pro Realtime 24.04 LTS | linux-realtime | 6.8.1-1030.31 | USN-7703-1 |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | 6.8.1-1030.31~22.04.1 | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips | 6.8.0-78.78+fips1 | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 10 | rv +76 | 6.12.0-124.8.1.el10_1 | RHSA-2025:20095 |
| RHEL 9 | rv +75 | 5.14.0-611.5.1.el9_7 | RHSA-2025:20518 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 10 | rv +74 | 6.12.0-124.8.1.el10_1 | ALSA-2025:20095 |
| AlmaLinux 9 | rv +73 | 5.14.0-611.5.1.el9_7 | ALSA-2025:20518 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 10 | kernel | 6.12.0-124.8.1.el10_1 | RLSA-2025:20095 |
| Rocky Linux 9 | kernel | 5.14.0-611.5.1.el9_7 | RLSA-2025:20518 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | kernel-64kb +6 | 6.4.0-150700.53.3.1 | SUSE-SU-2025:01951-1 |
| SLES 15 SP7 | kernel-azure +2 | 6.4.0-150700.20.3.1 | SUSE-SU-2025:01967-1 |
| SLES 15 SP7 | kernel-default-base | 6.4.0-150700.53.3.1.150700.17.2.1 | SUSE-SU-2025:01951-1 |
| SLES 15 SP6 | kernel-64kb +3 | 6.4.0-150600.23.47.2 | SUSE-SU-2025:1180-1 |
| SLES 15 SP6 | kernel-azure +1 | 6.4.0-150600.8.34.2 | SUSE-SU-2025:1177-1 |
| SLES 15 SP6 | kernel-coco +3 | 6.4.0-15061.21.coco15sp6.1 | SUSE-SU-2025:01919-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.47.2.150600.12.20.2 | SUSE-SU-2025:1180-1 |
| SLES 15 SP6 | kernel-docs +2 | 6.4.0-150600.23.47.1 | SUSE-SU-2025:1180-1 |
| SLES 15 SP6 | kernel-syms-azure | 6.4.0-150600.8.34.1 | SUSE-SU-2025:1177-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLE Micro 6.1 | kernel-default-base | 6.4.0-28.1.21.6 | SUSE-SU-2025:20270-1 |
| SLE Micro 6.1 | kernel-livepatch-MICRO-6-0_Update_6 +1 | 1-3.1 | SUSE-SU-2025:20270-1, SUSE-SU-2025:20260-1 |
| SLE Micro 6.1 | kernel-rt +4 | 6.4.0-28.1 | SUSE-SU-2025:20270-1, SUSE-SU-2025:20260-1 |
| SLE Micro 6.0 | kernel-default-base | 6.4.0-28.1.21.6 | SUSE-SU-2025:20192-1 |
| SLE Micro 6.0 | kernel-livepatch-MICRO-6-0_Update_6 +1 | 1-3.1 | SUSE-SU-2025:20192-1, SUSE-SU-2025:20190-1 |
| SLE Micro 6.0 | kernel-rt +4 | 6.4.0-28.1 | SUSE-SU-2025:20192-1, SUSE-SU-2025:20190-1 |
| SLE Live Patching 15 SP7 | kernel-default | 6.4.0-150700.53.3.1 | SUSE-SU-2025:01951-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_1 | 1-150700.15.3.1 | SUSE-SU-2025:01951-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.47.2 | SUSE-SU-2025:1180-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6-RT_Update_10 | 1-150600.1.5.1 | SUSE-SU-2025:1178-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_10 | 1-150600.13.5.1 | SUSE-SU-2025:1180-1 |
| SUSE Real Time Module 15 SP6 | kernel-rt +3 | 6.4.0-150600.10.34.1 | SUSE-SU-2025:1178-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Leap 15.6 | dtb-aarch64 +4 | 6.4.0-150600.23.47.1 | SUSE-SU-2025:1180-1 |
| openSUSE Leap 15.6 | kernel-64kb +5 | 6.4.0-150600.23.47.2 | SUSE-SU-2025:1180-1 |
| openSUSE Leap 15.6 | kernel-azure +1 | 6.4.0-150600.8.34.2 | SUSE-SU-2025:1177-1 |
| openSUSE Leap 15.6 | kernel-default-base | 6.4.0-150600.23.47.2.150600.12.20.2 | SUSE-SU-2025:1180-1 |
| openSUSE Leap 15.6 | kernel-rt +3 | 6.4.0-150600.10.34.1 | SUSE-SU-2025:1178-1 |
| openSUSE Leap 15.6 | kernel-syms-azure | 6.4.0-150600.8.34.1 | SUSE-SU-2025:1177-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.130-139.222 | 1.0-0.amzn2023 | ALAS2023-2025-901 |
| Amazon Linux 2023 | perf +14 | 6.1.130-139.222.amzn2023 | ALAS2023-2025-901 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | 6.6.82.1-1 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | kernel-uek +34 | 6.12.0-101.33.4.3.el10uek | ELSA-2025-20530, ELSA-2025-20480 |
Advisories 42
- SSA-457936 SSA-457936: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.7 Siemens ProductCERT · Nov 10, 2026
- USN-7737-1 linux-azure, linux-azure-6.8, linux-azure-nvidia vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7719-1 linux-raspi-realtime vulnerabilities Ubuntu Security Notices (USN) · Nov 3, 2026
- USN-7703-2 linux-aws-6.8, linux-gcp, linux-gcp-6.8, linux-gkeop, linux-ibm, linux-ibm-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7703-4 linux-gke, linux-hwe-6.8, linux-nvidia, linux-nvidia-6.8, linux-nvidia-lowlatency, linux-raspi vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7703-1 linux, linux-aws, linux-lowlatency, linux-lowlatency-hwe-6.8, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7703-3 linux-oracle, linux-oracle-6.8 vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-1 linux, linux-azure, linux-azure-6.11, linux-gcp, linux-gcp-6.11, linux-hwe-6.11, linux-oem-6.11, linux-raspi, linux-realtime vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- USN-7521-3 linux-lowlatency, linux-lowlatency-hwe-6.11, linux-oracle vulnerabilities Ubuntu Security Notices (USN) · Oct 30, 2026
- ALSA-2025:20095 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ALSA-2025:20518 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- ICSA-26-295-16 Siemens SIMATIC S7-1500 TM MFP CISA ICS & IT advisories · Oct 22, 2026
- ICSA-26-295-11 Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP CISA ICS & IT advisories · Oct 22, 2026
- WID-SEC-2026-3891 Siemens SIMATIC S7: Mehrere Schwachstelle BSI CERT-Bund (WID) · Oct 18, 2026
- RHSA-2025:20518 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2025:20095 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- SSA-019113 SSA-019113: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.6 Siemens ProductCERT · Oct 13, 2026
- SSA-082556 SSA-082556: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP V3.1.5 Siemens ProductCERT · Oct 13, 2026
- SSA-784472 SSA-784472: Vulnerabilities in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1.1 Siemens ProductCERT · Oct 13, 2026
- WID-SEC-2025-1439 Dell Secure Connect Gateway: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff BSI CERT-Bund (WID) · Oct 11, 2026
- WID-SEC-2025-0545 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Sep 21, 2026
- WID-SEC-2026-2253 IBM Security Verify Access: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- ICSA-26-209-04 Siemens SIMATIC S7-1500 CPU 1518(F)-4 PN/DP MFP CISA ICS & IT advisories · Jul 28, 2026
- ICSA-25-162-05 Siemens SIMATIC S7-1500 CPU family CISA ICS & IT advisories · May 14, 2026
- SUSE-SU-2025:20270-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20192-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20260-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2025:20190-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- DSA-5900-1 linux - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-4193-1 linux-6.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2025:01967-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01919-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:01951-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1177-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1180-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2025:1178-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- RLSA-2025:20095 Moderate: kernel security update Rocky Linux Security Advisories · Nov 27, 2025
- RLSA-2025:20518 Moderate: kernel security update Rocky Linux Security Advisories · Nov 21, 2025
- ALAS2023-2025-901 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Oct 2, 2025
- ELSA-2025-20530 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Aug 18, 2025
- ELSA-2025-20480 Important: Unbreakable Enterprise kernel security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jul 17, 2025
- NCSC-2025-0187 Kwetsbaarheden verholpen in Siemens producten NCSC-NL (Netherlands) · Jun 10, 2025
References
- https://git.kernel.org/stable/c/87858bbf21da239ace300d61dd209907995c0491
- https://git.kernel.org/stable/c/f1d5e6a5e468308af7759cf5276779d3155c5e98
- https://git.kernel.org/stable/c/cd34a07f744451e2ecf9005bb7d24d0b2fb83656
- https://git.kernel.org/stable/c/69cafd9413084cd5012cf5d7c7ec6f3d493726d9
- https://git.kernel.org/stable/c/9b6412e6979f6f9e0632075f8f008937b5cd4efd