CVE-2025-38549

Description

In the Linux kernel, the following vulnerability has been resolved: efivarfs: Fix memory leak of efivarfs_fs_info in fs_context error paths When processing mount options, efivarfs allocates efivarfs_fs_info (sfi) early in fs_context initialization. However, sfi is associated with the superblock and typically freed when the superblock is destroyed. If the fs_context is released (final put) before fill_super is called—such as on error paths or during reconfiguration—the sfi structure would leak, as ownership never transfers to the superblock. Implement the .free callback in efivarfs_context_ops to ensure any allocated sfi is properly freed if the fs_context is torn down before fill_super, preventing this memory leak.

CVSS Metrics

• v3.1•MEDIUM•Score: 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

EPSS Trends

Current EPSS score: 0.13%• Percentile: 3%

Techniques & Countermeasures

• CWE-401•Missing Release of Memory after Effective Lifetime

  The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Affected Systems

• linux•linux

  ≥ 5329aa5101f73c451bcd48deaf3f296685849d9c, < 816d36973467d1c9c08a48bdffe4675e219a2e84 | ≥ 5329aa5101f73c451bcd48deaf3f296685849d9c, < e9fabe7036bb8be6071f39dc38605508f5f57b20 | ≥ 5329aa5101f73c451bcd48deaf3f296685849d9c, < 64e135f1eaba0bbb0cdee859af3328c68d5b9789 | 6.7

• linux•linux kernel

  ≥ 6.7, < 6.12.40 | ≥ 6.13, < 6.15.8 | 6.16:rc1 | 6.16:rc2 | 6.16:rc3 | 6.16:rc4 | 6.16:rc5 | 6.16:rc6

References (3)

• https://git.kernel.org/stable/c/816d36973467d1c9c08a48bdffe4675e219a2e84
• https://git.kernel.org/stable/c/e9fabe7036bb8be6071f39dc38605508f5f57b20
• https://git.kernel.org/stable/c/64e135f1eaba0bbb0cdee859af3328c68d5b9789