Kernel Security Update — AlmaLinux 10 (ALSA-2026:91565)

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

Security Fix(es):  

  * kernel: tcp: restrict SO_ATTACH_FILTER to priv users (CVE-2026-53236)
  * kernel: fuse: re-lock request before replacing page cache folio (CVE-2026-53388)
  * kernel: net: shaper: rework the VALID marking (again) (CVE-2026-64027)
  * kernel: net/handshake: hand off the pinned file reference to accept_doit (CVE-2026-63979)
  * kernel: net/handshake: Drain pending requests at net namespace exit (CVE-2026-63978)
  * kernel: af_unix: Fix UAF read of tail->len in unix_stream_data_wait() (CVE-2026-64109)
  * kernel: net/handshake: Take a long-lived file reference at submit (CVE-2026-64523)
  * kernel: net: gro: fix double aggregation of flush-marked skbs (CVE-2026-68136)
  * kernel: net/packet: avoid fanout hook re-registration after unregister (CVE-2026-68338)
  * kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE (CVE-2026-72083)
  * kernel: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled (CVE-2026-74515)
  * kernel: net: smc: fix splice entry lifetime imbalance in smc_rx_splice (CVE-2026-74631)
  * kernel: usb: usbfs: fix use-after-free of usb_device in usbdev_release() (CVE-2026-80824)
  * kernel: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions (CVE-2026-89638)
  * kernel: vfio/pci: clear vdev->msi_perm after freeing it on init failure (CVE-2026-89777)
  * kernel: md/raid5-ppl: fix use-after-free in ppl_do_flush() (CVE-2026-93262)


Bug Fix(es) and Enhancement(s):  

  * x86/microcode: Add platform mask to Intel microcode "old" list [AlmaLinux-10] [almalinux-10.2.z] (JIRA:AlmaLinux-212778)
  * net: NULL pointer deref kernel panic in fib6_walk_continue under heavy VRF churn [almalinux-10.2.z] (JIRA:AlmaLinux-245489)
  * backport fixes for lockdep issues reported with rt-debug [almalinux-10.2.z] (JIRA:AlmaLinux-259937)


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.