Red Hat Security Advisory: kernel security update

Fixed packages 91

Vulnerabilities 2

• High 8.8
  CVE-2026-53266 Exploited Public exploit

  netfilter: bridge: make ebt_snat ARP rewrite writable

  In the Linux kernel, the following vulnerability has been resolved: netfilter: bridge: make ebt_snat ARP rewrite writable The ebtables SNAT target keeps the Ethernet source address rewrite behind skb_ensure_writable(skb, 0). This is intentional: at the bridge…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jun 25, 2026

  KEV Sep 18, 2026
• High 7.8
  CVE-2025-39964 Exploited Public exploit

  crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg

  In the Linux kernel, the following vulnerability has been resolved: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg Issuing two writes to the same af_alg socket is bogus as the data will be interleaved in an unpredictable fashion. Furthermore, c…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Oct 13, 2025

  KEV Sep 18, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2403545
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2485368
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_71326.json
• report
  https://access.redhat.com/security/cve/CVE-2025-39964
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-39964
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-39964
• article
  https://lore.kernel.org/linux-cve-announce/2025101334-CVE-2025-39964-7964@gregkh/T
• article
  https://www.cisa.gov/known-exploited-vulnerabilities-catalog
• report
  https://access.redhat.com/security/cve/CVE-2026-53266
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-53266
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-53266
• article
  https://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53266-6162@gregkh/T/#u