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High RLSA-2025:9079 8 CVEs

Important: kernel security update

Published Oct 3, 2025 · Updated Oct 8, 2025

Ecosystem: Rocky Linux

Summary

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

Security Fix(es):

* kernel: ndisc: use RCU protection in ndisc_alloc_skb() (CVE-2025-21764)

* kernel: ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up (CVE-2025-21887)

* kernel: keys: Fix UAF in key_put() (CVE-2025-21893)

* kernel: cifs: Fix integer overflow while processing closetimeo mount option (CVE-2025-21962)

* kernel: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd (CVE-2025-21969)

* kernel: cifs: Fix integer overflow while processing acdirmax mount option (CVE-2025-21963)

* kernel: wifi: cfg80211: cancel wiphy_work before freeing wiphy (CVE-2025-21979)

* kernel: smb: client: fix UAF in decryption with multichannel (CVE-2025-37750)

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 · 10 kernel 0:6.12.0-55.17.1.el10_0

Vulnerabilities 8

  • Critical 9.8
    CVE-2025-37750

    smb: client: fix UAF in decryption with multichannel

    In the Linux kernel, the following vulnerability has been resolved: smb: client: fix UAF in decryption with multichannel After commit f7025d861694 ("smb: client: allocate crypto only for primary server") and commit b0abcd65ec54 ("smb: client: fix UAF in async…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 8.8
    CVE-2025-21969

    Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd

    In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd After the hci sync command releases l2cap_conn, the hci receive data work queue references the released l2cap_conn when sendin…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-21764

    ndisc: use RCU protection in ndisc_alloc_skb()

    In the Linux kernel, the following vulnerability has been resolved: ndisc: use RCU protection in ndisc_alloc_skb() ndisc_alloc_skb() can be called without RTNL or RCU being held. Add RCU protection to avoid possible UAF.

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-21887

    ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up

    In the Linux kernel, the following vulnerability has been resolved: ovl: fix UAF in ovl_dentry_update_reval by moving dput() in ovl_link_up The issue was caused by dput(upper) being called before ovl_dentry_update_reval(), while upper->d_flags was still acces…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-21893

    keys: Fix UAF in key_put()

    In the Linux kernel, the following vulnerability has been resolved: keys: Fix UAF in key_put() Once a key's reference count has been reduced to 0, the garbage collector thread may destroy it at any time and so key_put() is not allowed to touch the key after t…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2025-21979

    wifi: cfg80211: cancel wiphy_work before freeing wiphy

    In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: cancel wiphy_work before freeing wiphy A wiphy_work can be queued from the moment the wiphy is allocated and initialized (i.e. wiphy_new_nm). When a wiphy_work is queued, the …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • Medium 5.5
    CVE-2025-21962

    cifs: Fix integer overflow while processing closetimeo mount option

    In the Linux kernel, the following vulnerability has been resolved: cifs: Fix integer overflow while processing closetimeo mount option User-provided mount parameter closetimeo of type u32 is intended to have an upper limit, but before it is validated, the va…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • Medium 5.5
    CVE-2025-21963

    cifs: Fix integer overflow while processing acdirmax mount option

    In the Linux kernel, the following vulnerability has been resolved: cifs: Fix integer overflow while processing acdirmax mount option User-provided mount parameter acdirmax of type u32 is intended to have an upper limit, but before it is validated, the value …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2348575
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2355405
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2356295
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2356624
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2356633
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2356642
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2356652
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2363341