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High ALSA-2025:10371 3 CVEs

Important: kernel security update

Published Jul 7, 2025 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

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

Security Fix(es):

* kernel: ipv6: mcast: extend RCU protection in igmp6_send() (CVE-2025-21759)
* kernel: x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes (CVE-2025-21991)
* kernel: vmxnet3: Fix malformed packet sizing in vmxnet3_process_xdp (CVE-2025-37799)

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 2

ReleasePackageFixed in
AlmaLinux · 10 kernel-abi-stablelists 6.12.0-55.20.1.el10_0
AlmaLinux · 10 kernel-doc 6.12.0-55.20.1.el10_0

Vulnerabilities 3

  • High 8.6
    CVE-2025-37799

    vmxnet3: Fix malformed packet sizing in vmxnet3_process_xdp

    In the Linux kernel, the following vulnerability has been resolved: vmxnet3: Fix malformed packet sizing in vmxnet3_process_xdp vmxnet3 driver's XDP handling is buggy for packet sizes using ring0 (that is, packet sizes between 128 - 3k bytes). We noticed MTU-…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2025-21759

    ipv6: mcast: extend RCU protection in igmp6_send()

    In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: extend RCU protection in igmp6_send() igmp6_send() can be called without RTNL or RCU being held. Extend RCU protection so that we can safely fetch the net pointer and avoid a pot…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-21991

    x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes

    In the Linux kernel, the following vulnerability has been resolved: x86/microcode/AMD: Fix out-of-bounds on systems with CPU-less NUMA nodes Currently, load_microcode_amd() iterates over all NUMA nodes, retrieves their CPU masks and unconditionally accesses p…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-21759
  • report
    https://access.redhat.com/security/cve/CVE-2025-21991
  • report
    https://access.redhat.com/security/cve/CVE-2025-37799
  • report
    https://bugzilla.redhat.com/2348596
  • report
    https://bugzilla.redhat.com/2356917
  • report
    https://bugzilla.redhat.com/2363876
  • advisory
    https://errata.almalinux.org/10/ALSA-2025-10371.html