Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Fixed packages 158

Vulnerabilities 15

• Critical 9.8
  CVE-2026-63978

  net/handshake: Drain pending requests at net namespace exit

  In the Linux kernel, the following vulnerability has been resolved: net/handshake: Drain pending requests at net namespace exit The arguments to list_splice_init() in handshake_net_exit() are reversed. The call moves the local empty "requests" list onto hn->h…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 19, 2026
• Critical 9.8
  CVE-2026-63979

  net/handshake: hand off the pinned file reference to accept_doit

  In the Linux kernel, the following vulnerability has been resolved: net/handshake: hand off the pinned file reference to accept_doit handshake_req_next() removes the request from the per-net pending list and drops hn_lock before handshake_nl_accept_doit() rea…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jul 19, 2026
• Critical 9.8
  CVE-2026-64523

  net/handshake: Take a long-lived file reference at submit

  In the Linux kernel, the following vulnerability has been resolved: net/handshake: Take a long-lived file reference at submit handshake_nl_accept_doit() needs the file pointer backing req->hr_sk->sk_socket to survive the window between handshake_req_next() an…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2026
• Critical 9.8
  CVE-2026-68476

  ipvs: reload ip header after head reallocation

  In the Linux kernel, the following vulnerability has been resolved: ipvs: reload ip header after head reallocation __ip_vs_get_out_rt() calls skb_ensure_writable() which may reallocate skb->head.

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Aug 15, 2026
• High 8.8
  CVE-2026-74515

  KVM: s390: pci: Reject adapter interrupt forwarding if already enabled

  In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled The MPCIFC instruction doesn't allow registering adapter interrupts without first unregistering. So reject any request t…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Aug 15, 2026
• High 8.8
  CVE-2026-89777

  vfio/pci: clear vdev->msi_perm after freeing it on init failure

  In the Linux kernel, the following vulnerability has been resolved: vfio/pci: clear vdev->msi_perm after freeing it on init failure vfio_msi_cap_len() lazily allocates the per-device MSI permission table: vdev->msi_perm = kmalloc_obj(struct perm_bits, GFP_KER…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Sep 16, 2026
• High 7.8
  CVE-2026-53388

  fuse: re-lock request before replacing page cache folio

  In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before replacing page cache folio fuse_try_move_folio() unlocks the request on entry but does not re-lock it on the success path. This means fuse_chan_abort() can end th…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Jul 19, 2026
• High 7.8
  CVE-2026-64266

  fuse: re-lock request before returning from fuse_ref_folio()

  In the Linux kernel, the following vulnerability has been resolved: fuse: re-lock request before returning from fuse_ref_folio() fuse_ref_folio() unlocks the request but does not re-lock it before returning. fuse_chan_abort() can end the request and the async…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Jul 25, 2026
• High 7.8
  CVE-2026-89638

  smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions

  In the Linux kernel, the following vulnerability has been resolved: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions When a file has the setuid or setgid bit set and is written to, the VFS strips those bits and issues a …

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Sep 11, 2026
• High 7.8
  CVE-2026-93262

  md/raid5-ppl: fix use-after-free in ppl_do_flush()

  In the Linux kernel, the following vulnerability has been resolved: md/raid5-ppl: fix use-after-free in ppl_do_flush() The loop in ppl_do_flush() continues iterating after calling ppl_io_unit_finished(), touching io->pending_flushes and leading to a use-after…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Sep 24, 2026
• High 7.8
  CVE-2026-98320

  netfilter: flowtable: hold reference on ct until flow is released

  In the Linux kernel, the following vulnerability has been resolved: netfilter: flowtable: hold reference on ct until flow is released nf_ct_put() releases the ct->ext area inmediately, the rcu typesafe semantics also allow to refer to the wrong conntrack from…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Oct 6, 2026
• High 7.5
  CVE-2026-72242

  selinux: avoid sk_socket dereference in selinux_sctp_bind_connect()

  In the Linux kernel, the following vulnerability has been resolved: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() selinux_sctp_bind_connect() dereferences sk->sk_socket to pass a struct socket * to selinux_socket_bind() and selinux_socke…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  Aug 15, 2026
• Unscored —
  CVE-2024-57974

  udp: Deal with race between UDP socket address change and rehash

  In the Linux kernel, the following vulnerability has been resolved: udp: Deal with race between UDP socket address change and rehash If a UDP socket changes its local address while it's receiving datagrams, as a result of connect(), there is a period during w…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Feb 27, 2025
• Unscored —
  CVE-2026-80824

  usb: usbfs: fix use-after-free of usb_device in usbdev_release()

  In the Linux kernel, the following vulnerability has been resolved: usb: usbfs: fix use-after-free of usb_device in usbdev_release() usbdev_release() drops its reference to the struct usb_device before draining the list of completed async URBs, but that drain…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Sep 4, 2026
• Unscored —
  CVE-2026-98222

  KEYS: encrypted: fix integer overflow of datablob_len

  In the Linux kernel, the following vulnerability has been resolved: KEYS: encrypted: fix integer overflow of datablob_len encrypted_key_alloc() stores datablob_len in a u16. It is computed from multiple string and payload lengths. If the result exceeds U16_MA…

  Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  Oct 6, 2026

References

• article
  https://access.redhat.com/security/updates/classification/#important
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2348512
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2502255
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2502376
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2502382
• report
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• report
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• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2516251
• report
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• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2517006
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2528642
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2532122
• report
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• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2540323
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2546385
• report
  https://bugzilla.redhat.com/show_bug.cgi?id=2546494
• advisory
  https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_90365.json
• report
  https://access.redhat.com/security/cve/CVE-2024-57974
• advisory
  https://www.cve.org/CVERecord?id=CVE-2024-57974
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2024-57974
• article
  https://lore.kernel.org/linux-cve-announce/2025022632-CVE-2024-57974-189e@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-53388
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-53388
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-53388
• article
  https://kernelcve.org/list/?q=CVE-2026-53388
• article
  https://lore.kernel.org/linux-cve-announce/2026071935-CVE-2026-53388-eeaf@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-63978
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-63978
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-63978
• article
  https://lore.kernel.org/linux-cve-announce/2026071901-CVE-2026-63978-8f72@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-63979
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-63979
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-63979
• article
  https://kernelcve.org/list/?q=CVE-2026-63979
• article
  https://lore.kernel.org/linux-cve-announce/2026071901-CVE-2026-63979-85c4@gregkh/T
• report
  https://access.redhat.com/security/cve/CVE-2026-64266
• advisory
  https://www.cve.org/CVERecord?id=CVE-2026-64266
• advisory
  https://nvd.nist.gov/vuln/detail/CVE-2026-64266
• article
  https://kernelcve.org/list/?q=CVE-2026-64266