Red Hat Security Advisory: kernel-rt security update

Fixed packages 28

Vulnerabilities 3

• High 7.8
  CVE-2026-23001 Public exploit

  macvlan: fix possible UAF in macvlan_forward_source()

  In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointe…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jan 25, 2026
• 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=2432664
• 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_9835.json
• report
  https://access.redhat.com/security/cve/CVE-2026-23001
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-23001
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-23001
• article
  https://lore.kernel.org/linux-cve-announce/2026012534-CVE-2026-23001-7ab0@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