Red Hat Security Advisory: kernel security update

Fixed packages 90

Vulnerabilities 7

• High 8.8
  CVE-2026-31709

  smb: client: validate the whole DACL before rewriting it in cifsacl

  In the Linux kernel, the following vulnerability has been resolved: smb: client: validate the whole DACL before rewriting it in cifsacl build_sec_desc() and id_mode_to_cifs_acl() derive a DACL pointer from a server-supplied dacloffset and then use the incomin…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  May 1, 2026
• High 8.8
  CVE-2026-43322

  Bluetooth: hci_sync: Fix UAF in le_read_features_complete

  In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_sync: Fix UAF in le_read_features_complete This fixes the following backtrace caused by hci_conn being freed before le_read_features_complete but after hci_le_read_remote_featu…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  May 8, 2026
• High 8.1
  CVE-2026-31613

  smb: client: fix OOB reads parsing symlink error response

  In the Linux kernel, the following vulnerability has been resolved: smb: client: fix OOB reads parsing symlink error response When a CREATE returns STATUS_STOPPED_ON_SYMLINK, smb2_check_message() returns success without any length validation, leaving the syml…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Apr 24, 2026
• High 7.8
  CVE-2025-38653

  proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al

  In the Linux kernel, the following vulnerability has been resolved: proc: use the same treatment to check proc_lseek as ones for proc_read_iter et.al Check pde->proc_ops->proc_lseek directly may cause UAF in rmmod scenario. It's a gap in proc_reg_open() after…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Aug 22, 2025
• High 7.8
  CVE-2026-43329

  netfilter: flowtable: strictly check for maximum number of actions

  In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: strictly check for maximum number of actions The maximum number of flowtable hardware offload actions in IPv6 is: * ethernet mangling (4 payload actions, 2 for each ethe…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  May 8, 2026
• High 7.1
  CVE-2026-46243 Public exploit

  smb: client: reject userspace cifs.spnego descriptions

  In the Linux kernel, the following vulnerability has been resolved: smb: client: reject userspace cifs.spnego descriptions cifs.spnego key descriptions contain authority-bearing fields such as pid, uid, creduid, and upcall_target that cifs.upcall treats as ke…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jun 1, 2026
• Unscored —
  CVE-2025-68366

  nbd: defer config unlock in nbd_genl_connect

  In the Linux kernel, the following vulnerability has been resolved: nbd: defer config unlock in nbd_genl_connect There is one use-after-free warning when running NBD_CMD_CONNECT and NBD_CLEAR_SOCK: nbd_genl_connect nbd_alloc_and_init_config // config_refs=1 n…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Dec 24, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2390372
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2424881
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2461480
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2464476
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2468124
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2468131
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2481486
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_23329.json
• report
  https://access.redhat.com/security/cve/CVE-2025-38653
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-38653
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-38653
• article
  https://lore.kernel.org/linux-cve-announce/2025082238-CVE-2025-38653-35ba@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2025-68366
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-68366
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-68366
• article
  https://lore.kernel.org/linux-cve-announce/2025122459-CVE-2025-68366-b367@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-31613
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-31613
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-31613
• article
  https://lore.kernel.org/linux-cve-announce/2026042422-CVE-2026-31613-b061@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-31709
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-31709
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-31709
• article
  https://lore.kernel.org/linux-cve-announce/2026050122-CVE-2026-31709-335b@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-43322
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-43322
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-43322
• article
  https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43322.mbox
• report
  https://access.redhat.com/security/cve/CVE-2026-43329
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-43329
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-43329
• article
  https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-43329.mbox
• report
  https://access.redhat.com/security/cve/CVE-2026-46243
• article
  https://access.redhat.com/security/vulnerabilities/RHSB-2026-005
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-46243
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-46243
• article
  https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=3da1fdf4efbc490041eb4f836bf596201203f8f2
• article
  https://lore.kernel.org/linux-cve-announce/2026060140-CVE-2026-46243-3d1c@gregkh/