What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-26 · updated 2026-07-08
• Weakness: CWE-416

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.

Affected products

• Linux kernel: from 4.4 before 5.10.258; from 5.11 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33 — fixed in 5.10.258, 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141

How to fix

Upgrade to a fixed version: Linux kernel 5.10.258, 5.15.209, 6.1.175, 6.12.91. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/02beb178e2e159daeb8f992d7abb16a37da31664
• https://git.kernel.org/stable/c/0ad8c4a03a358de7811ba1ab8cbd1fe76ad0ff6b
• https://git.kernel.org/stable/c/15c4cc3850cfe1b973eb7b63c02314b267f06a64
• https://git.kernel.org/stable/c/187069ccc3474516af32350e20d7e449160fa6de
• https://git.kernel.org/stable/c/6c6ce2ccb4fcf1617fec83f91b21aa0265f30701
• https://git.kernel.org/stable/c/742001919653e7313b4e91780c5d108be1692365
• https://git.kernel.org/stable/c/81c9e7e4030e71391ab479c4c6e17b64802577aa
• https://git.kernel.org/stable/c/c02053a9055d5fdfd32432287cca8958db1d5bc5

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