Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Fixed packages 52

Vulnerabilities 5

• Critical 9.8
  CVE-2026-74480

  net: bridge: stop fast-leave after deleting a port group

  In the Linux kernel, the following vulnerability has been resolved: net: bridge: stop fast-leave after deleting a port group br_multicast_leave_group() iterates mp->ports with pp = &p->next in its fast-leave path. After br_multicast_del_pg() removes p, contin…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Aug 15, 2026
• High 7.8
  CVE-2026-43074 Public exploit

  eventpoll: defer struct eventpoll free to RCU grace period

  In the Linux kernel, the following vulnerability has been resolved: eventpoll: defer struct eventpoll free to RCU grace period In certain situations, ep_free() in eventpoll.c will kfree the epi->ep eventpoll struct while it still being used by another concurr…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  May 6, 2026
• High 7.8
  CVE-2026-43499 Public exploit

  rtmutex: Use waiter::task instead of current in remove_waiter()

  In the Linux kernel, the following vulnerability has been resolved: rtmutex: Use waiter::task instead of current in remove_waiter() remove_waiter() is used by the slowlock paths, but it is also used for proxy-lock rollback in rt_mutex_start_proxy_lock() when …

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  May 21, 2026
• High 7.8
  CVE-2026-46242 Public exploit

  eventpoll: fix ep_remove struct eventpoll / struct file UAF

  In the Linux kernel, the following vulnerability has been resolved: eventpoll: fix ep_remove struct eventpoll / struct file UAF ep_remove() (via ep_remove_file()) cleared file->f_ep under file->f_lock but then kept using @file inside the critical section (is_…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  May 30, 2026
• Unscored —
  CVE-2026-53166 Rejected

  This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

  linux-raspi2 linux-hwe linux-azure linux-riscv Ubuntu
  Jun 25, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2467019
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2480453
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2483519
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2492805
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2517046
• article
  https://issues.redhat.com/browse/VOYAGER-1193
• article
  https://issues.redhat.com/browse/VOYAGER-1200
• article
  https://issues.redhat.com/browse/VOYAGER-1223
• article
  https://issues.redhat.com/browse/VOYAGER-68
• article
  https://issues.redhat.com/browse/VOYAGER-84
• article
  https://issues.redhat.com/browse/VOYAGER-869
• article
  https://issues.redhat.com/browse/VOYAGER-95
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_73187.json
• report
  https://access.redhat.com/security/cve/CVE-2026-43074
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-43074
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-43074
• article
  https://lore.kernel.org/linux-cve-announce/2026050601-CVE-2026-43074-ac01@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-43499
• article
  https://access.redhat.com/security/vulnerabilities/RHSB-2026-010
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-43499
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-43499
• article
  https://lore.kernel.org/linux-cve-announce/2026052158-CVE-2026-43499-1294@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-46242
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-46242
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-46242
• article
  https://lore.kernel.org/linux-cve-announce/2026053014-CVE-2026-46242-8394@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-53166
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-53166
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-53166
• article
  https://lore.kernel.org/linux-cve-announce/2026062551-CVE-2026-53166-2861@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-74480
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-74480
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-74480
• article
  https://lore.kernel.org/linux-cve-announce/2026081536-CVE-2026-74480-e620@gregkh/T