binfmt_misc: use exe_file_deny_write_access() for the interpreter clone

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74486
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:17:53 UTC
Updated2026-08-17 06:19:44 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: binfmt_misc: use exe_file_deny_write_access() for the interpreter clone For MISC_FMT_OPEN_FILE entries load_misc_binary() clones the registered interpreter file and denies write access to the clone via plain deny_write_access(). The clone is installed as bprm->interpreter and later released by the exec machinery through exe_file_allow_write_access() which skips the i_writecount increment for files with FMODE_FSNOTIFY_HSM set. The deny and allow side can therefore come to different conclusions when pre-content watches are in play: if a pre-content watch is added to the interpreter after registration every subsequent exec through that entry takes a write denial on the clone that is never paired with a write allowance, driving the interpreter inode's i_writecount further down with each exec and leaving the interpreter unwritable even after the entry and all its users are gone. Take the write denial via exe_file_deny_write_access() so both sides of the pairing base their decision on the same file mode, and propagate failure instead of silently ignoring it: an interpreter that is concurrently open for writing now fails the exec with ETXTBSY, exactly like an interpreter freshly opened via open_exec() would.

Risk And Classification

EPSS: 0.001660000 probability, percentile 0.063180000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0357ef03c94ef835bd44a0658b8edb672a9dbf51 255a758697da87a205e072e0cfc35897b8f743b1 git Not specified
CNA Linux Linux affected 0357ef03c94ef835bd44a0658b8edb672a9dbf51 f0edbaf487e4653a680a7abb91c1df94cb7886aa git Not specified
CNA Linux Linux affected 0357ef03c94ef835bd44a0658b8edb672a9dbf51 fa5990ca8fd917003e526036bcc50413edb9722c git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/fa5990ca8fd917003e526036bcc50413edb9722c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f0edbaf487e4653a680a7abb91c1df94cb7886aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/255a758697da87a205e072e0cfc35897b8f743b1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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