Red Hat Security Advisory: kernel security update

Fixed packages 57

Vulnerabilities 6

• Critical 9.8
  CVE-2026-52993 Public exploit

  tipc: fix double-free in tipc_buf_append()

  In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipc_buf_append() tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the old one. In tipc_buf_append(), it was being called with a point…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jun 24, 2026
• Critical 9.8
  CVE-2026-53002

  netfilter: conntrack: remove sprintf usage

  In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: remove sprintf usage Replace it with scnprintf, the buffer sizes are expected to be large enough to hold the result, no need for snprintf+overflow check. Increase buffer…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jun 24, 2026
• Critical 9.8
  CVE-2026-64268

  RDMA/siw: bound Read Response placement to the RREAD length

  In the Linux kernel, the following vulnerability has been resolved: RDMA/siw: bound Read Response placement to the RREAD length In drivers/infiniband/sw/siw/siw_qp_rx.c, siw_proc_rresp() places each inbound Read Response DDP segment at sge->laddr + wqe->proce…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2026
• Critical 9.8
  CVE-2026-64564 Public exploit

  sctp: don't free the ASCONF's own transport in DEL-IP processing

  In the Linux kernel, the following vulnerability has been resolved: sctp: don't free the ASCONF's own transport in DEL-IP processing sctp_process_asconf() caches the transport the ASCONF chunk is processed against in asconf->transport (== chunk->transport, se…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Aug 4, 2026
• High 7.8
  CVE-2023-53781

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

  In the Linux kernel, the following vulnerability has been resolved: smc: Fix use-after-free in tcp_write_timer_handler(). With Eric's ref tracker, syzbot finally found a repro for use-after-free in tcp_write_timer_handler() by kernel TCP sockets. [0] If SMC c…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Dec 9, 2025
• High 7.1
  CVE-2026-46150

  fanotify: fix false positive on permission events

  In the Linux kernel, the following vulnerability has been resolved: fanotify: fix false positive on permission events fsnotify_get_mark_safe() may return false for a mark on an unrelated group, which results in bypassing the permission check. Fix by skipping …

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  May 28, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2420279
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2482612
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2492329
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2492437
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2507089
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2510890
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_69906.json
• report
  https://access.redhat.com/security/cve/CVE-2023-53781
• advisory
  https://www.cve.org/CVERecord?id=CVE-2023-53781
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2023-53781
• article
  https://lore.kernel.org/linux-cve-announce/2025120939-CVE-2023-53781-cb1d@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-46150
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-46150
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-46150
• article
  https://lore.kernel.org/linux-cve-announce/2026052822-CVE-2026-46150-c96d@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-52993
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-52993
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-52993
• article
  https://lore.kernel.org/linux-cve-announce/2026062445-CVE-2026-52993-34a2@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-53002
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-53002
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-53002
• article
  https://lore.kernel.org/linux-cve-announce/2026062447-CVE-2026-53002-8577@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64268
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64268
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64268
• article
  https://lore.kernel.org/linux-cve-announce/2026072559-CVE-2026-64268-629a@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64564
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64564
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64564
• article
  https://lore.kernel.org/linux-cve-announce/2026080404-CVE-2026-64564-6762@gregkh/T