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High RLSA-2026:64808 8 CVEs

Important: kernel security update

Published Sep 9, 2026 · Updated Sep 9, 2026

Ecosystem: Rocky Linux

Summary

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

* kernel: can: bcm: add locking for bcm_op runtime updates (CVE-2025-38004)

* kernel: io_uring/poll: fix signed comparison in io_poll_get_ownership() (CVE-2026-52933)

* kernel: netfilter: nat: use kfree_rcu to release ops (CVE-2026-53000)

* kernel: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() (CVE-2026-64136)

* kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page (CVE-2026-64320)

* kernel: nvmet-auth: validate reply message payload bounds against transfer length (CVE-2026-64319)

* kernel: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU (CVE-2026-64287)

* kernel: smb: client: fix change notify replay double-free (CVE-2026-64384)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Fixed packages 1

ReleasePackageFixed in
Rocky Linux · 9 kernel 0:5.14.0-687.45.1.el9_8

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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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
  • 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

References

  • 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://access.redhat.com/errata/RHSA-2026:64808