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OpenAdvisories
High ALSA-2025:7903 3 CVEs

Important: kernel security update

Published May 19, 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: vsock: Keep the binding until socket destruction (CVE-2025-21756)
* kernel: dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature (CVE-2025-21966)
* kernel: net: ppp: Add bound checking for skb data on ppp_sync_txmung (CVE-2025-37749)

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 76

ReleasePackageFixed in
AlmaLinux · 9 kernel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-debug 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-debug-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-debug-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-debug-devel-matched 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-debug-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-debug-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-debug-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-devel-matched 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-64k-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-abi-stablelists 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-cross-headers 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug-devel-matched 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-debug-uki-virt 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-devel-matched 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-doc 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-headers 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-debug 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-debug-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-debug-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-debug-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-debug-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-debug-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-64k-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-debug 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-debug-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-debug-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-debug-kvm 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-debug-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-debug-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-debug-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-kvm 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-rt-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-tools 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-tools-libs 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-tools-libs-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-uki-virt 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-uki-virt-addons 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-zfcpdump 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-zfcpdump-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-zfcpdump-devel 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-zfcpdump-devel-matched 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-zfcpdump-modules 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-zfcpdump-modules-core 5.14.0-570.17.1.el9_6
AlmaLinux · 9 kernel-zfcpdump-modules-extra 5.14.0-570.17.1.el9_6
AlmaLinux · 9 libperf 5.14.0-570.17.1.el9_6
AlmaLinux · 9 perf 5.14.0-570.17.1.el9_6
AlmaLinux · 9 python3-perf 5.14.0-570.17.1.el9_6
AlmaLinux · 9 rtla 5.14.0-570.17.1.el9_6
AlmaLinux · 9 rv 5.14.0-570.17.1.el9_6

Vulnerabilities 3

  • High 8.2
    CVE-2025-37749

    net: ppp: Add bound checking for skb data on ppp_sync_txmung

    In the Linux kernel, the following vulnerability has been resolved: net: ppp: Add bound checking for skb data on ppp_sync_txmung Ensure we have enough data in linear buffer from skb before accessing initial bytes. This prevents potential out-of-bounds accesse…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu
  • High 7.8
    CVE-2025-21756 Public exploit

    vsock: Keep the binding until socket destruction

    In the Linux kernel, the following vulnerability has been resolved: vsock: Keep the binding until socket destruction Preserve sockets bindings; this includes both resulting from an explicit bind() and those implicitly bound through autobind during connect(). …

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.8
    CVE-2025-21966

    dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature

    In the Linux kernel, the following vulnerability has been resolved: dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature Fix memory corruption due to incorrect parameter being passed to bio_init

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2025-21756
  • report
    https://access.redhat.com/security/cve/CVE-2025-21966
  • report
    https://access.redhat.com/security/cve/CVE-2025-37749
  • report
    https://bugzilla.redhat.com/2348609
  • report
    https://bugzilla.redhat.com/2356605
  • report
    https://bugzilla.redhat.com/2363332
  • advisory
    https://errata.almalinux.org/9/ALSA-2025-7903.html