RLSA-2026:91565: Important: kernel security, bug fix, and enhancement update

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

Security Fix(es):

kernel: tcp: restrict SOATTACHFILTER 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 acceptdoit (CVE-2026-63979)

kernel: net/handshake: Drain pending requests at net namespace exit (CVE-2026-63978)

kernel: afunix: Fix UAF read of tail->len in unixstreamdatawait() (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 smcrxsplice (CVE-2026-74631)

kernel: usb: usbfs: fix use-after-free of usbdevice in usbdevrelease() (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->msiperm after freeing it on init failure (CVE-2026-89777)

kernel: md/raid5-ppl: fix use-after-free in ppldoflush() (CVE-2026-93262)

Bug Fix(es) and Enhancement(s):

x86/microcode: Add platform mask to Intel microcode "old" list [Rocky Linux-10] [rhel-10.2.z] (JIRA:Rocky Linux-212778)

net: NULL pointer deref kernel panic in fib6walkcontinue under heavy VRF churn [rhel-10.2.z] (JIRA:Rocky Linux-245489)

backport fixes for lockdep issues reported with rt-debug [rhel-10.2.z] (JIRA:Rocky Linux-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.