Description
In the Linux kernel, the following vulnerability has been resolved:
cifs: fix potential use-after-free bugs in TCP_Server_Info::hostname
TCP_Server_Info::hostname may be updated once or many times during
reconnect, so protect its access outside reconnect path as well and
then prevent any potential use-after-free bugs.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Linux | Linux | 5.0 | 6.1.28 |
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 | 6.3.7-1 | — |
| Debian 13 | linux | 6.3.7-1 | — |
| Debian 12 | linux | 6.1.37-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Nvidia-BlueField 22.04 LTS | linux-bluefield | No fix yet | — |
| Ubuntu 26.04 LTS | linux-vmware | No fix yet | — |
| Ubuntu 24.04 LTS | linux-riscv +10 | No fix yet | — |
| Ubuntu 22.04 LTS | linux +47 | No fix yet | — |
| Ubuntu 22.04 LTS | linux-azure | 5.15.0-1051.59 | — |
| Ubuntu 22.04 LTS | linux-azure-fde | 5.15.0-1051.59.1 | — |
| Ubuntu 20.04 LTS | linux-azure-5.15 | 5.15.0-1051.59~20.04.1 | — |
| Ubuntu 20.04 LTS | linux-gke +28 | No fix yet | — |
Show 9 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 22.04 LTS | linux-realtime +1 | No fix yet | — |
| Ubuntu Pro FIPS 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-updates 22.04 LTS | linux-fips +2 | No fix yet | — |
| Ubuntu Pro FIPS-updates 20.04 LTS | linux-fips +3 | No fix yet | — |
| Ubuntu Pro FIPS-preview 22.04 LTS | linux-fips +2 | No fix yet | — |
| Ubuntu Pro 20.04 LTS | linux +19 | No fix yet | — |
| Ubuntu Pro 18.04 LTS | linux-aws-5.4 +6 | No fix yet | — |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9 | bpftool | 7.3.0-427.13.1.el9_4 | RHSA-2024:2394 |
| RHEL 9 | rv +64 | 5.14.0-427.13.1.el9_4 | RHSA-2024:2394 |
| RHEL 8 | perf +26 | 4.18.0-553.82.1.el8_10 | RHSA-2025:19447 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 9.2 E4S | bpftool | 7.0.0-284.155.1.el9_2 | RHSA-2026:1909 |
| RHEL 9.2 E4S | kernel-rt +14 | 5.14.0-284.155.1.rt14.440.el9_2 | RHSA-2026:1946 |
| RHEL 9.2 E4S | perf +47 | 5.14.0-284.155.1.el9_2 | RHSA-2026:1909 |
| RHEL 9.0 E4S | kernel-rt +12 | 5.14.0-70.165.1.rt21.237.el9_0 | RHSA-2026:2577 |
| RHEL 9.0 E4S | perf +28 | 5.14.0-70.165.1.el9_0 | RHSA-2026:2573 |
| RHEL 8.8 TUS | perf +17 | 4.18.0-477.128.1.el8_8 | RHSA-2026:2535 |
| RHEL 8.8 E4S | perf +18 | 4.18.0-477.128.1.el8_8 | RHSA-2026:2535 |
| RHEL 8.6 TUS | perf +17 | 4.18.0-372.179.1.el8_6 | RHSA-2026:2490 |
| RHEL 8.6 E4S | perf +25 | 4.18.0-372.179.1.el8_6 | RHSA-2026:2490 |
| RHEL 8.6 AUS | perf +17 | 4.18.0-372.179.1.el8_6 | RHSA-2026:2490 |
| RHEL 8.4 EUS Long Life | perf +17 | 4.18.0-305.184.1.el8_4 | RHSA-2026:1886 |
| RHEL 8.4 AUS | perf +17 | 4.18.0-305.184.1.el8_4 | RHSA-2026:1886 |
| RHEL 8.2 AUS | perf +17 | 4.18.0-193.183.1.el8_2 | RHSA-2026:1512 |
AlmaLinux
Errata ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux 8 | perf +24 | 4.18.0-553.82.1.el8_10 | ALSA-2025:19447 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP5 | kernel-64kb +6 | 5.14.21-150500.55.133.1 | SUSE-SU-2026:0317-1 |
| SLES 15 SP5 | kernel-default-base | 5.14.21-150500.55.133.1.150500.6.65.1 | SUSE-SU-2026:0317-1 |
| SLES 15 SP4 | kernel-64kb +6 | 5.14.21-150400.24.194.1 | SUSE-SU-2026:0617-1 |
| SLES 15 SP4 | kernel-default-base | 5.14.21-150400.24.194.1.150400.24.98.3 | SUSE-SU-2026:0617-1 |
| SLES 12 SP5 | kernel-syms +2 | 4.12.14-122.293.1 | SUSE-SU-2026:0473-1 |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 15 SP5 | kernel-default-base | 5.14.21-150500.55.133.1.150500.6.65.1 | SUSE-SU-2026:0317-1 |
| SLES for SAP 15 SP5 | kernel-docs +4 | 5.14.21-150500.55.133.1 | SUSE-SU-2026:0317-1 |
| SLES for SAP 15 SP4 | kernel-default-base | 5.14.21-150400.24.194.1.150400.24.98.3 | SUSE-SU-2026:0617-1 |
| SLES for SAP 15 SP4 | kernel-docs +4 | 5.14.21-150400.24.194.1 | SUSE-SU-2026:0617-1 |
| SLE Micro 5.5 | kernel-default-base | 5.14.21-150500.55.133.1.150500.6.65.1 | SUSE-SU-2026:0317-1 |
| SLE Micro 5.5 | kernel-rt +1 | 5.14.21-150500.13.118.1 | SUSE-SU-2026:0263-1 |
| SLE Micro 5.5 | kernel-source +1 | 5.14.21-150500.55.133.1 | SUSE-SU-2026:0317-1 |
| SLE Micro 5.4 | kernel-default | 5.14.21-150400.24.194.1 | SUSE-SU-2026:0617-1 |
| SLE Micro 5.4 | kernel-default-base | 5.14.21-150400.24.194.1.150400.24.98.3 | SUSE-SU-2026:0617-1 |
| SLE Micro 5.4 | kernel-rt +1 | 5.14.21-150400.15.142.1 | SUSE-SU-2026:0411-1 |
| SLE Micro 5.3 | kernel-default | 5.14.21-150400.24.194.1 | SUSE-SU-2026:0617-1 |
| SLE Micro 5.3 | kernel-default-base | 5.14.21-150400.24.194.1.150400.24.98.3 | SUSE-SU-2026:0617-1 |
| SLE Micro 5.3 | kernel-rt +1 | 5.14.21-150400.15.142.1 | SUSE-SU-2026:0411-1 |
| SLE Live Patching 15 SP5 | kernel-default | 5.14.21-150500.55.133.1 | SUSE-SU-2026:0317-1 |
| SLE Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_34 | 1-150500.11.3.1 | SUSE-SU-2026:0317-1 |
| SLE Live Patching 15 SP4 | kernel-default | 5.14.21-150400.24.194.1 | SUSE-SU-2026:0617-1 |
| SLE Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_48 | 1-150400.9.7.1 | SUSE-SU-2026:0617-1 |
| SLE Live Patching 12 SP5 | kernel-default | 4.12.14-122.293.1 | SUSE-SU-2026:0473-1 |
| SLE Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_77 | 1-8.3.1 | SUSE-SU-2026:0473-1 |
| SLE HPC 15 SP5 | kernel-64kb +5 | 5.14.21-150500.55.133.1 | SUSE-SU-2026:0317-1 |
| SLE HPC 15 SP5 | kernel-default-base | 5.14.21-150500.55.133.1.150500.6.65.1 | SUSE-SU-2026:0317-1 |
| SLE HPC 15 SP4 | kernel-64kb +5 | 5.14.21-150400.24.194.1 | SUSE-SU-2026:0617-1 |
| SLE HPC 15 SP4 | kernel-default-base | 5.14.21-150400.24.194.1.150400.24.98.3 | SUSE-SU-2026:0617-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | kernel-livepatch-6.1.29-47.49 | 1.0-0.amzn2023 | ALAS2023-2023-184 |
| Amazon Linux 2023 | perf +12 | 6.1.29-47.49.amzn2023 | ALAS2023-2023-184 |
Advisories 18
- WID-SEC-2025-2756 Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service BSI CERT-Bund (WID) · Nov 9, 2026
- ALSA-2025:19447 Moderate: kernel security update AlmaLinux Security Advisories · Oct 29, 2026
- RHSA-2024:2394 Red Hat Security Advisory: kernel security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Oct 17, 2026
- RHSA-2026:2577 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Sep 27, 2026
- RHSA-2026:2573 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Sep 27, 2026
- RHSA-2026:2490 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Sep 27, 2026
- RHSA-2026:1946 Red Hat Security Advisory: kernel-rt security update Red Hat Security Advisories (RHSA) · Sep 27, 2026
- RHSA-2026:1909 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Sep 27, 2026
- RHSA-2026:2535 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2026:1886 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 22, 2026
- RHSA-2025:19447 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 20, 2026
- RHSA-2026:1512 Red Hat Security Advisory: kernel security update Red Hat Security Advisories (RHSA) · Aug 5, 2026
- SUSE-SU-2026:0317-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0473-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Mar 23, 2026
- SUSE-SU-2026:0617-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 26, 2026
- ALAS2023-2023-184 Important: kernel security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Feb 11, 2026
- SUSE-SU-2026:0411-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 10, 2026
- SUSE-SU-2026:0263-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026