Vulnerability in Linux

[ Description ]Official description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack: use get_unaligned_be32() in tcp_sack() The timestamp-only fast path dereferences the option stream as *(__be32 *)ptr, which assumes 4-byte alignment that the TCP option stream does not guarantee. Use get_unaligned_be32() instead, which reads the value safely and already returns host byte order, so the htonl() on the comparison constant can be dropped. This matches the existing get_unaligned_be32() use later in the same function.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• CERT-FR9 Oct 2026CERTFR-2026-AVI-1289

  Multiple vulnerabilities in the Debian LTS Linux kernel Translated from French

  Multiple vulnerabilities have been discovered in the Debian LTS Linux kernel. Some of them allow an attacker to cause privilege escalation, a breach of data confidentiality and denial of service.

  CVE-2025-38237CVE-2025-39833CVE-2025-39925+1311 more CVEs
• CERT-FR9 Oct 2026CERTFR-2026-AVI-1287

  Multiple vulnerabilities in the Red Hat Linux kernel Translated from French

  Multiple vulnerabilities have been discovered in the Red Hat Linux kernel. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-53230CVE-2026-53398CVE-2026-68480+96 more CVEs
• CERT-FR2 Oct 2026CERTFR-2026-AVI-1253

  Multiple vulnerabilities in the Debian Linux kernel Translated from French

  Multiple vulnerabilities have been discovered in the Debian Linux kernel. Some of them allow an attacker to cause privilege escalation, a breach of data confidentiality and denial of service.

  CVE-2025-38237CVE-2025-39833CVE-2025-39925+1310 more CVEs
• BSI CERT-Bund24 Sep 2026WID-SEC-2026-3579

  Linux Kernel: Multiple vulnerabilities Translated from German

  CVE-2026-97615CVE-2026-97978CVE-2026-98127+590 more CVEs

[ References ]References

• git.kernel.org/stable/c/0d5ad732e4fdc569eb85861115e8f7b4c2c67852
• git.kernel.org/stable/c/4abc1af7ac209c066f4e5dd75cdd56876e5829a9
• git.kernel.org/stable/c/55bcc3376cd7b18954cc9814da697504fdaf12bf
• git.kernel.org/stable/c/740ad3d17a281f7764dda4dbeb37cea52e2e31ae
• git.kernel.org/stable/c/7ecfa46a536578a7ed335ddf31a854127268c27c
• git.kernel.org/stable/c/a0523267de2523522b0f70972dd1ffa22ec6176c
• git.kernel.org/stable/c/d3bf9eae486490832bd08fd62ab0ac601f346bd4