VulnerabilityPublished 3 Apr 2026Updated 5 Nov 2026

CVE-2026-23421: Linux kernel · drm/xe/configfs: Free ctx_restore_mid_bb in release

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e377182f0266f46f02d01838e6bde67b9dac0d66 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 22:04 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in e377182f0266f46f02d01838e6bde67b9dac0d66, 3557359ea3df32430ea7c30f7a708ca9a91d7e0e, 7f971dfd48983074adc7bbcea3ee95ce7aad47cb

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by 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 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to e377182f0266f46f02d01838e6bde67b9dac0d66, 3557359ea3df32430ea7c30f7a708ca9a91d7e0e or 7f971dfd48983074adc7bbcea3ee95ce7aad47cb.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ b30d5de3d40c3fa642079bac0d91f17091c5f877, < e377182f0266f46f02d01838e6bde67b9dac0d66	Fixed in e377182f0266f46f02d01838e6bde67b9dac0d66
LinuxLinux	Affected ≥ b30d5de3d40c3fa642079bac0d91f17091c5f877, < 3557359ea3df32430ea7c30f7a708ca9a91d7e0e	Fixed in 3557359ea3df32430ea7c30f7a708ca9a91d7e0e
LinuxLinux	Affected ≥ b30d5de3d40c3fa642079bac0d91f17091c5f877, < 7f971dfd48983074adc7bbcea3ee95ce7aad47cb	Fixed in 7f971dfd48983074adc7bbcea3ee95ce7aad47cb
LinuxLinux	Affected =6.18	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: drm/xe/configfs: Free ctx_restore_mid_bb in release ctx_restore_mid_bb memory is allocated in wa_bb_store(), but xe_config_device_release() only frees ctx_restore_post_bb. Free ctx_restore_mid_bb[0].cs as well to avoid leaking the allocation when the configfs device is removed. (cherry picked from commit a235e7d0098337c3f2d1e8f3610c719a589e115f)

References

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