What’s Vulnerable › Vulnerabilities

CVE-2023-53391: shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-18 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: shmem: use ramfs_kill_sb() for kill_sb method of ramfs-based tmpfs As the ramfs-based tmpfs uses ramfs_init_fs_context() for the init_fs_context method, which allocates fc->s_fs_info, use ramfs_kill_sb() to free it and avoid a memory leak.

Affected products

• Linux kernel: from 2.6.30 before 5.10.188; from 5.11 before 5.15.121; from 5.16 before 6.1.39; from 6.2 before 6.4.4 — fixed in 5.10.188, 5.15.121, 6.1.39, 6.4.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.188, 5.15.121, 6.1.39, 6.4.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/1f34bf8b442c6d720e7fa6f15e8702427e48aea9
• https://git.kernel.org/stable/c/36ce9d76b0a93bae799e27e4f5ac35478c676592
• https://git.kernel.org/stable/c/487f229efea80c00dd7397547ec4f25fb8999d99
• https://git.kernel.org/stable/c/5fada375113767b3b57f1b04f7a4fe64ffaa626f
• https://git.kernel.org/stable/c/ebe07db840992a3886694ac3d303b06f4b70ce00

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