Description
In the Linux kernel, the following vulnerability has been resolved:
Revert "net/smc: Introduce TCP ULP support"
This reverts commit d7cd421da9da2cc7b4d25b8537f66db5c8331c40.
As reported by Al Viro, the TCP ULP support for SMC is fundamentally
broken. The implementation attempts to convert an active TCP socket
into an SMC socket by modifying the underlying `struct file`, dentry,
and inode in-place, which violates core VFS invariants that assume
these structures are immutable for an open file, creating a risk of
use after free errors and general system instability.
Given the severity of this design flaw and the fact that cleaner
alternatives (e.g., LD_PRELOAD, BPF) exist for legacy application
transparency, the correct course of action is to remove this feature
entirely.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.17 | 6.1.191 |
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 | 6.19.6-1 | — |
| Debian 13 | linux | 6.12.115-2 | — |
| Debian 12 | linux | No fix yet | — |
| Debian 12 | linux-6.12 | 6.12.115-2~deb12u1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 24.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu 25.10 | linux +8 | No fix yet | — |
| Ubuntu 24.04 LTS | linux +43 | No fix yet | — |
| Ubuntu 24.04 LTS | linux-nvidia-tegra | 6.8.0-1035.38 | USN-8781-1 |
| Ubuntu 22.04 LTS | linux-riscv +42 | No fix yet | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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-realtime +3 | No fix yet | — |
| Ubuntu Pro Realtime 22.04 LTS | linux-realtime-6.8 | No fix yet | — |
| Ubuntu Pro FIPS-updates 24.04 LTS | linux-fips +3 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | rv +75 | 5.14.0-687.46.1.el9_8 | RHSA-2026:66180 |
| RHEL 8 | kernel-rt +12 | 4.18.0-553.185.1.rt7.526.el8_10 | RHSA-2026:98100 |
| RHEL 8 | perf +26 | 4.18.0-553.185.1.el8_10 | RHSA-2026:98099 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 9 | rv +73 | 5.14.0-687.46.1.el9_8 | ALSA-2026:66180 |
| AlmaLinux 8 | kernel-rt +9 | 4.18.0-553.185.1.rt7.526.el8_10 | ALSA-2026:98100 |
| AlmaLinux 8 | perf +24 | 4.18.0-553.185.1.el8_10 | ALSA-2026:98099 |
Rocky Linux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Rocky Linux 9 | kernel | 5.14.0-687.46.1.el9_8 | RLSA-2026:66180 |
| Rocky Linux 8 | kernel | 4.18.0-553.185.1.el8_10 | RLSA-2026:98099 |
| Rocky Linux 8 | kernel-rt | 4.18.0-553.185.1.rt7.526.el8_10 | RLSA-2026:98100 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | kernel-64kb +6 | 6.4.0-150700.53.66.1 | SUSE-SU-2026:3166-1, SUSE-SU-2026:2800-1 |
| SLES 15 SP7 | kernel-default-base | 6.4.0-150700.53.66.1.150700.17.39.1 | SUSE-SU-2026:3166-1, SUSE-SU-2026:2800-1 |
| SLES 15 SP7 | kernel-docs | 6.4.0-150700.53.66.2 | SUSE-SU-2026:3166-1, SUSE-SU-2026:2800-1 |
| SLES 15 SP6 | kernel-64kb +6 | 6.4.0-150600.23.125.1 | SUSE-SU-2026:3156-1 |
| SLES 15 SP6 | kernel-default-base | 6.4.0-150600.23.125.1.150600.12.58.3 | SUSE-SU-2026:3156-1 |
Show 5 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP6 | kernel-default-base | 6.4.0-150600.23.125.1.150600.12.58.3 | SUSE-SU-2026:3156-1 |
| SLES for SAP 15 SP6 | kernel-docs +4 | 6.4.0-150600.23.125.1 | SUSE-SU-2026:3156-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.151.1 | SUSE-SU-2026:2840-1 |
| SLE Live Patching 15 SP7 | kernel-default | 6.4.0-150700.53.66.1 | SUSE-SU-2026:3166-1, SUSE-SU-2026:2800-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7-RT_Update_18 | 1-150700.1.5.1 | SUSE-SU-2026:3130-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_18 | 1-150700.15.3.1 | SUSE-SU-2026:2800-1 |
| SLE Live Patching 15 SP7 | kernel-livepatch-SLE15-SP7_Update_19 | 1-150700.15.3.4 | SUSE-SU-2026:3166-1 |
| SLE Live Patching 15 SP6 | kernel-default | 6.4.0-150600.23.125.1 | SUSE-SU-2026:3156-1 |
| SLE Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_29 | 1-150600.13.7.1 | SUSE-SU-2026:3156-1 |
| SUSE Real Time Module 15 SP7 | kernel-rt +2 | 6.4.0-150700.7.67.1 | SUSE-SU-2026:3130-1 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | kernel | No fix yet | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 8 | perf +19 | 4.18.0-553.185.1.el8_10 | ELSA-2026-98099 |
Advisories 17
- RHSA-2026:98099 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:98100 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- RHSA-2026:66180 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Nov 13, 2026
- ALSA-2026:98099 Important: kernel security update AlmaLinux Security Advisories · Nov 13, 2026
- ALSA-2026:98100 Important: kernel-rt security update AlmaLinux Security Advisories · Nov 13, 2026
- WID-SEC-2026-1870 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 12, 2026
- RLSA-2026:98099 Important: kernel security update Rocky Linux Security Advisories · Nov 12, 2026
- RLSA-2026:98100 Important: kernel-rt security update Rocky Linux Security Advisories · Nov 12, 2026
- ELSA-2026-98099 Important: kernel security update (Oracle Linux 8) Oracle Linux Security Advisories (ELSA) · Nov 11, 2026
- USN-8781-1 linux-nvidia-tegra vulnerabilities Ubuntu Security Notices (USN) · Nov 9, 2026
- ALSA-2026:66180 Important: kernel security, bug fix, and enhancement update AlmaLinux Security Advisories · Oct 29, 2026
- RLSA-2026:66180 Important: kernel security, bug fix, and enhancement update Rocky Linux Security Advisories · Sep 11, 2026
- SUSE-SU-2026:3166-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Jul 22, 2026
- SUSE-SU-2026:3156-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Jul 22, 2026
- SUSE-SU-2026:3130-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Jul 21, 2026
- SUSE-SU-2026:2840-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Jul 11, 2026
- SUSE-SU-2026:2800-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Jul 9, 2026
References
- https://git.kernel.org/stable/c/c7cb174a1edc80fe1f75b169a57726ed46704074
- https://git.kernel.org/stable/c/74d33525db50d9d95156c79cc874752654e66e70
- https://git.kernel.org/stable/c/dc824ffc28e5c9d0020b6bee2651b4aceed5b2bf
- https://git.kernel.org/stable/c/dc24e03be0e4bb2aad1a9b272c4f86de3b11969a
- https://git.kernel.org/stable/c/6c505d95c69e27dbf28fea29dc84d2498d69515c
- https://git.kernel.org/stable/c/df31a6b0a3057e66994ad6ccf5d95b9b9514f033