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High 1 exploited CVE ALSA-2026:19664 3 CVEs

Important: kernel-rt security update

Published May 20, 2026 · Updated Oct 29, 2026

Ecosystem: AlmaLinux

Summary

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

* kernel: "Fragnesia" is a variant of Dirty Frag vulnerability in the ESP/XFRM leading to Local Privilege Escalation (LPE) vulnerability in the Linux kernel (CVE-2026-46300)
* kernel: Read root-owned files as an unprivileged user (CVE-2026-46333)

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 10

ReleasePackageFixed in
AlmaLinux · 8 kernel-rt 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-core 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-debug 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-debug-core 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-debug-devel 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-debug-modules 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-debug-modules-extra 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-devel 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-modules 4.18.0-553.125.1.rt7.466.el8_10
AlmaLinux · 8 kernel-rt-modules-extra 4.18.0-553.125.1.rt7.466.el8_10

Vulnerabilities 3

  • High 7.8
    CVE-2026-46300 Exploited Public exploit EPSS 16%

    net: skbuff: preserve shared-frag marker during coalescing

    In the Linux kernel, the following vulnerability has been resolved: net: skbuff: preserve shared-frag marker during coalescing skb_try_coalesce() can attach paged frags from @from to @to. If @from has SKBFL_SHARED_FRAG set, the resulting @to skb can contain t…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
    KEV Oct 28, 2026
  • High 8.8
    CVE-2026-43503 Public exploit

    net: skbuff: propagate shared-frag marker through frag-transfer helpers

    In the Linux kernel, the following vulnerability has been resolved: net: skbuff: propagate shared-frag marker through frag-transfer helpers Two frag-transfer helpers (__pskb_copy_fclone() and skb_shift()) fail to propagate the SKBFL_SHARED_FRAG bit in skb_shi…

    Linux Linux linux-raspi2 linux-hwe Linux Debian Ubuntu Azure Linux
  • High 7.1
    CVE-2026-46333 Public exploit

    ptrace: slightly saner 'get_dumpable()' logic

    In the Linux kernel, the following vulnerability has been resolved: ptrace: slightly saner 'get_dumpable()' logic The 'dumpability' of a task is fundamentally about the memory image of the task - the concept comes from whether it can core dump or not - and ma…

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

References

  • report
    https://access.redhat.com/security/cve/CVE-2026-46300
  • report
    https://access.redhat.com/security/cve/CVE-2026-46333
  • report
    https://bugzilla.redhat.com/2477015
  • report
    https://bugzilla.redhat.com/2477802
  • advisory
    https://errata.almalinux.org/8/ALSA-2026-19664.html
  • report
    https://www.redhat.com/security/data/cve/CVE-2026-43503.html