What’s Vulnerable › Vulnerabilities

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

• 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-415

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.

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/240c71a2aea36a1a4210f911a1c32ea88777e8e4
• https://git.kernel.org/stable/c/3afca89fae501dbd7421e1777b5b8f033b1d98d0
• https://git.kernel.org/stable/c/5c209299b0113e289e238fa5f2e8f00c59f76060
• https://git.kernel.org/stable/c/5d4f3d0f64f1016cb78b400a70b67df91fac99b5
• https://git.kernel.org/stable/c/82f6dcea46cf5de65c4ba7283f7c7b34de4a324d
• https://git.kernel.org/stable/c/88ebadbf0deefdaccdab868b44ff70a0a257f473
• https://git.kernel.org/stable/c/c494a11da45ad7ec9b0ff216c3e3ace351193bb6
• https://git.kernel.org/stable/c/fc0089f82c3e36060c2c79156bc2018bfb16b56b

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