VulnerabilityPublished 26 Jun 2026Updated 6 Nov 2026

CVE-2026-53296: Linux kernel · mailbox: mailbox-test: free channels on probe error

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in c02053a9055d5fdfd32432287cca8958db1d5bc5 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 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, 2026-11-06.

Patch

Available – fixed in c02053a9055d5fdfd32432287cca8958db1d5bc5, 742001919653e7313b4e91780c5d108be1692365, 187069ccc3474516af32350e20d7e449160fa6de +5

Exploitation evidence

Disclosed: evidence found.
CVE published 26 Jun 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 6 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < c02053a9055d5fdfd32432287cca8958db1d5bc5	Fixed in c02053a9055d5fdfd32432287cca8958db1d5bc5
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 742001919653e7313b4e91780c5d108be1692365	Fixed in 742001919653e7313b4e91780c5d108be1692365
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 187069ccc3474516af32350e20d7e449160fa6de	Fixed in 187069ccc3474516af32350e20d7e449160fa6de
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 81c9e7e4030e71391ab479c4c6e17b64802577aa	Fixed in 81c9e7e4030e71391ab479c4c6e17b64802577aa
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 15c4cc3850cfe1b973eb7b63c02314b267f06a64	Fixed in 15c4cc3850cfe1b973eb7b63c02314b267f06a64
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 6c6ce2ccb4fcf1617fec83f91b21aa0265f30701	Fixed in 6c6ce2ccb4fcf1617fec83f91b21aa0265f30701

Description

In the Linux kernel, the following vulnerability has been resolved: mailbox: mailbox-test: free channels on probe error On probe error, free the previously obtained channels. This not only prevents a leak, but also UAF scenarios because the client structure will be removed nonetheless because it was allocated with devm.

References

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