Red Hat Security Advisory: kernel security update

Fixed packages 158

Vulnerabilities 8

• Critical 9.8
  CVE-2026-64136

  smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()

  In the Linux kernel, the following vulnerability has been resolved: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() Commit 96c4af418586 ("cifs: Fix locking usage for tcon fields") refactored cifs code to change cifs_tcp_ses_lock …

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jul 19, 2026
• Critical 9.8
  CVE-2026-64384

  smb: client: fix change notify replay double-free

  In the Linux kernel, the following vulnerability has been resolved: smb: client: fix change notify replay double-free A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_notify_init() fails before the next send, clea…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2026
• Critical 9.1
  CVE-2026-64319

  nvmet-auth: validate reply message payload bounds against transfer length

  In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: validate reply message payload bounds against transfer length nvmet_auth_reply() accesses the variable-length rval[] array using attacker-controlled hl (hash length) and dhvlen (D…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jul 25, 2026
• Critical 9.1
  CVE-2026-64320

  nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page

  In the Linux kernel, the following vulnerability has been resolved: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page nvmet_execute_disc_get_log_page() validates only the dword alignment of the host-supplied Log Page Offset (lpo). The 64-b…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2026
• High 8.2
  CVE-2026-64287

  KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU

  In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vGIC state into the hyp's private vCPU on every run. The vGIC list register save and restore use us…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2026
• High 7.8
  CVE-2026-52933

  io_uring/poll: fix signed comparison in io_poll_get_ownership()

  In the Linux kernel, the following vulnerability has been resolved: io_uring/poll: fix signed comparison in io_poll_get_ownership() io_poll_get_ownership() uses a signed comparison to check whether poll_refs has reached the threshold for the slowpath: if (unl…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jun 24, 2026
• High 7.8
  CVE-2026-53000

  netfilter: nat: use kfree_rcu to release ops

  In the Linux kernel, the following vulnerability has been resolved: netfilter: nat: use kfree_rcu to release ops Florian Westphal says: "Historically this is not an issue, even for normal base hooks: the data path doesn't use the original nf_hook_ops that are…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jun 24, 2026
• High 7.3
  CVE-2025-38004

  can: bcm: add locking for bcm_op runtime updates

  In the Linux kernel, the following vulnerability has been resolved: can: bcm: add locking for bcm_op runtime updates The CAN broadcast manager (CAN BCM) can send a sequence of CAN frames via hrtimer. The content and also the length of the sequence can be chan…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jun 8, 2025

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2370992
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2492097
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2492273
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2502527
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2507061
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2507096
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2507129
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2507287
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_64808.json
• report
  https://access.redhat.com/security/cve/CVE-2025-38004
• advisory
  https://www.cve.org/CVERecord?id=CVE-2025-38004
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2025-38004
• article
  https://lore.kernel.org/linux-cve-announce/2025060801-CVE-2025-38004-30d2@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-52933
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-52933
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-52933
• article
  https://lore.kernel.org/linux-cve-announce/2026062433-CVE-2026-52933-815c@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-53000
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-53000
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-53000
• article
  https://lore.kernel.org/linux-cve-announce/2026062447-CVE-2026-53000-2568@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64136
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64136
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64136
• article
  https://lore.kernel.org/linux-cve-announce/2026071928-CVE-2026-64136-5fb4@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64287
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64287
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64287
• article
  https://lore.kernel.org/linux-cve-announce/2026072503-CVE-2026-64287-ea42@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64319
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64319
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64319
• article
  https://lore.kernel.org/linux-cve-announce/2026072511-CVE-2026-64319-0860@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64320
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64320
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64320
• article
  https://lore.kernel.org/linux-cve-announce/2026072511-CVE-2026-64320-4b43@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64384