SB20260816232 - Improper control of a resource through its lifetime in Linux kernel fs

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-74487)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper resource management in binfmt_misc when removing an entry registered with the MISC_FMT_OPEN_FILE flag. A local user can register and remove such an entry to cause a denial of service.

The issue leaves the interpreter inode with a permanently negative write count until the inode is evicted from the inode cache, causing subsequent write attempts to fail with ETXTBSY.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b
• https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa
• https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5