VulnerabilityPublished 26 Jun 2026Updated 6 Nov 2026

CVE-2026-53294: Linux kernel · mailbox: mailbox-test: don't free the reused channel

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fc0089f82c3e36060c2c79156bc2018bfb16b56b : 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 fc0089f82c3e36060c2c79156bc2018bfb16b56b, c494a11da45ad7ec9b0ff216c3e3ace351193bb6, 240c71a2aea36a1a4210f911a1c32ea88777e8e4 +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, < fc0089f82c3e36060c2c79156bc2018bfb16b56b	Fixed in fc0089f82c3e36060c2c79156bc2018bfb16b56b
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < c494a11da45ad7ec9b0ff216c3e3ace351193bb6	Fixed in c494a11da45ad7ec9b0ff216c3e3ace351193bb6
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 240c71a2aea36a1a4210f911a1c32ea88777e8e4	Fixed in 240c71a2aea36a1a4210f911a1c32ea88777e8e4
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 88ebadbf0deefdaccdab868b44ff70a0a257f473	Fixed in 88ebadbf0deefdaccdab868b44ff70a0a257f473
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 82f6dcea46cf5de65c4ba7283f7c7b34de4a324d	Fixed in 82f6dcea46cf5de65c4ba7283f7c7b34de4a324d
LinuxLinux	Affected ≥ 8ea4484d0c2bb4e2152261943fa1a3522654b1c7, < 5d4f3d0f64f1016cb78b400a70b67df91fac99b5	Fixed in 5d4f3d0f64f1016cb78b400a70b67df91fac99b5

Description

In the Linux kernel, the following vulnerability has been resolved: mailbox: mailbox-test: don't free the reused channel The RX channel can be aliased to the TX channel if it has a different MMIO. This special case needs to be handled when freeing the channels otherwise a double-free occurs.

References

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