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VulnerabilityPublished

CVE-2026-100080: Linux kernel · xen-netback: Fix UAF when reading statistics data

Source GCVE Database

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Authoritative record:CVE-2026-100080· Medium

Not known to be exploited · fixed in ab9cdf1291be551da999510b30216a2886074d7a : update Linux kernel when convenient.

Data as of 6 Nov 2026, 22:43 UTC

Severity
Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in ab9cdf1291be551da999510b30216a2886074d7a, 4867687b6ad28ab84bc0811d8f8f9972e769da02, 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a +11

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 6 Nov 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • <5.10.274
  • <5.15.225
  • <6.1.192
  • <6.6.162
  • <6.12.116
  • <6.18.62
  • <7.3.3
Fixed in
  • ab9cdf1291be551da999510b30216a2886074d7a
  • 4867687b6ad28ab84bc0811d8f8f9972e769da02
  • 4223b33be49ee09acb6f1d26beb4a36dd3b8d63a
  • 89e534265b62c94749639350200b10370564bb3a
  • 37d5a73170579b30e67cc8b19ec69715eea3a6b6
  • 36f858f228e3f955b9336af7f94634747c221518
  • 7.3.3
  • 6cd611d2abdd8623a554e14145f82c1cb4e4467a
  • 6.18.62
  • 6.12.116
  • 6.6.162
  • 6.1.192
  • 5.15.225
  • 5.10.274
Debiandebian/linuxpkg:deb/debian/linuxOther threatsAffected
  • <5.10.274
  • <5.15.225
  • <6.1.192
  • <6.6.162
  • <6.12.116
  • <6.18.62
  • <7.3.3
Fixed in
  • 5.10.274
  • 5.15.225
  • 6.1.192
  • 6.6.162
  • 6.12.116
  • 6.18.62
  • 7.3.3

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A fix is available that calls synchronize_net() before freeing the queue data, preventing use-after-free conditions. Users should apply the official Linux kernel update that includes this fix. No additional mitigation steps are indicated.

Description

A use-after-free (UAF) vulnerability in the xen-netback driver of the Linux kernel was fixed. The issue occurs when network statistic data, protected by RCU, is freed without proper synchronization during queue teardown after an error connecting to the frontend. This can lead to access of freed or reused memory if the data is read concurrently via sysfs. The fix involves calling synchronize_net() before freeing the queue data to ensure safe memory access.

References

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