Red Hat Security Advisory: kernel security update

Fixed packages 48

Vulnerabilities 3

• 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-2026-64600 Public exploit

  xfs: resample the data fork mapping after cycling ILOCK

  In the Linux kernel, the following vulnerability has been resolved: xfs: resample the data fork mapping after cycling ILOCK xfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode, a data fork mapping, and a cow fork mapping. Unfortunately, thes…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 23, 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  This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.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=2480453
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2492805
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2498915
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_39984.json
• 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-2026-53166
• 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-2026-64600
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64600
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64600
• article
  https://cdn2.qualys.com/advisory/2026/07/22/RefluXFS.txt