RLSA-2026:21556

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

Security Fix(es):

• kernel: proc: use the same treatment to check proclseek as ones for procread_iter et.al (CVE-2025-38653)

• kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)

• kernel: nbd: defer config unlock in nbdgenlconnect (CVE-2025-68366)

• kernel: crypto: asymmetrickeys - prevent overflow in asymmetrickeygenerateid (CVE-2025-68724)

• kernel: iommu: disable SVA when CONFIG_X86 is set (CVE-2025-71089)

• kernel: netfilter: nf_tables: release flowtable after rcu grace period on error (CVE-2026-23392)

• kernel: netfilter: nfconntrackh323: check for zero length in DecodeQ931() (CVE-2026-23455)

• kernel: Bluetooth: SCO: Fix use-after-free in scorecvframe() due to missing sock_hold (CVE-2026-31408)

• kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)

• kernel: netfilter: ip6t_eui64: reject invalid MAC header for all packets (CVE-2026-31685)

• kernel: netfilter: nfconntrackhelper: pass helper to expect cleanup (CVE-2026-43027)

• kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)

• kernel: HID: wacom: fix out-of-bounds read in wacomintuosbt_irq (CVE-2026-43051)

• kernel: smb: client: validate the whole DACL before rewriting it in cifsacl (CVE-2026-31709)

• kernel: Bluetooth: SCO: fix race conditions in scosockconnect() (CVE-2026-43023)

• kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)

• kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)

• kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)

• kernel: mm/pagealloc: clear page->private in freepages_prepare() (CVE-2026-43303)

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.