Red Hat Security Advisory: kernel security update

Fixed packages 48

Vulnerabilities 4

• High 8.1
  CVE-2025-40168

  smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().

  In the Linux kernel, the following vulnerability has been resolved: smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match(). smc_clc_prfx_match() is called from smc_listen_work() and not under RCU nor RTNL. Using sk_dst_get(sk)->dev could trigger UA…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Nov 12, 2025
• High 7.8
  CVE-2025-40064

  smc: Fix use-after-free in __pnet_find_base_ndev().

  In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in __pnet_find_base_ndev(). syzbot reported use-after-free of net_device in __pnet_find_base_ndev(), which was called during connect(). [0] smc_pnet_find_ism_resource(…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Oct 28, 2025
• High 7.8
  CVE-2026-23231 Public exploit

  netfilter: nf_tables: fix use-after-free in nf_tables_addchain()

  In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hook…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Mar 4, 2026
• High 7.1
  CVE-2026-23204

  net/sched: cls_u32: use skb_header_pointer_careful()

  In the Linux kernel, the following vulnerability has been resolved: net/sched: cls_u32: use skb_header_pointer_careful() skb_header_pointer() does not fully validate negative @offset values. Use skb_header_pointer_careful() instead. GangMin Kim provided a rep…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Feb 14, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#moderate
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2406747
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2414482
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2439931
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2444376
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_9643.json
• report
  https://access.redhat.com/security/cve/CVE-2025-40064
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-40064
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-40064
• article
  https://lore.kernel.org/linux-cve-announce/2025102817-CVE-2025-40064-0c16@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-40168
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-40168
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-40168
• article
  https://lore.kernel.org/linux-cve-announce/2025111256-CVE-2025-40168-bdd5@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-23204
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-23204
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-23204
• article
  https://lore.kernel.org/linux-cve-announce/2026021437-CVE-2026-23204-be85@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-23231
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-23231
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-23231
• article
  https://lore.kernel.org/linux-cve-announce/2026030436-CVE-2026-23231-1a96@gregkh/T