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VulnerabilityPublished

CVE-2026-99280: Linux kernel · ksmbd: drain session procfs readers before dropping table references

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c : update Linux kernel when convenient.

Data as of 7 Nov 2026, 14:19 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 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c, 7.3, 1c087cf7d5386c708d8984b263280b42b3daada0

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 7 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 7 Nov 2026.

What to do

Upgrade Linux kernel to 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c, 7.3 or 1c087cf7d5386c708d8984b263280b42b3daada0.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • >=7.2.8 <7.3
Fixed in
  • 6789f0983f8e85ce3a5ed8c50fc05d613ead9c2c
  • 7.3
  • 1c087cf7d5386c708d8984b263280b42b3daada0
LinuxLinuxAffected
  • =7.3
Fixed in–

AI-suggested

A fix is available in Linux kernel version 7.3 and specific commits identified by hashes. Users should upgrade to version 7.3 or later to remediate this issue. No additional mitigation steps are indicated by the vendor advisory.

Description

A vulnerability in the Linux kernel's ksmbd component involves improper handling of session procfs readers during session cleanup. This flaw can lead to use-after-free conditions when session table references are dropped while procfs entries are still accessible. The issue is addressed by ensuring procfs entries are removed before dropping table references and properly draining procfs readers during connection cleanup.

References

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