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Medium RLSA-2026:3963 2 CVEs

Moderate: kernel security update

Published Mar 26, 2026 · Updated Mar 26, 2026

Summary

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

Security Fix(es):

* kernel: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() (CVE-2025-71085)

* kernel: macvlan: fix possible UAF in macvlan_forward_source() (CVE-2026-23001)

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 · 8 kernel 0:4.18.0-553.111.1.el8_10

Vulnerabilities 2

  • High 7.8
    CVE-2026-23001 Public exploit

    macvlan: fix possible UAF in macvlan_forward_source()

    In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointe…

  • High 7.5

    ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr()

    In the Linux kernel, the following vulnerability has been resolved: ipv6: BUG() in pskb_expand_head() as part of calipso_skbuff_setattr() There exists a kernel oops caused by a BUG_ON(nhead < 0) at net/core/skbuff.c:2232 in pskb_expand_head(). This bug is tri…

References

  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2429026
  • report
    https://bugzilla.redhat.com/show_bug.cgi?id=2432664