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
Updated2026-08-23 13:16:44 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: 0.001770000 probability, percentile 0.072090000 (date 2026-08-24)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5b432413f7bbbc8b935138490a57be05c1921684 c65eb018c12179b5e2c7afe1f0956298576fecec git Not specified
CNA Linux Linux affected bb4715098d8e340bbbdd3a874b31f89867c8067e 2bd860b7e752a51185960143cab9fec7bf32c84e git Not specified
CNA Linux Linux affected c152be5adc0975c75cc4f50891c9072d52d60b47 eea4b7c7711b1e425272d23352af157f45f4c3e3 git Not specified
CNA Linux Linux affected bf5ed2ef5cdb7b47ce606e3d48ea6eb803b31503 2fdf8b07bee5ef99ec77773a6be05fbb8ee5cdb9 git Not specified
CNA Linux Linux affected 483217fd6f7ccd98b3ed2531a54f75ed144b4499 f1e7ea3c8e070f19771cdaef55bbeda1359ad490 git Not specified
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/c65eb018c12179b5e2c7afe1f0956298576fecec 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eea4b7c7711b1e425272d23352af157f45f4c3e3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f1e7ea3c8e070f19771cdaef55bbeda1359ad490 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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/2fdf8b07bee5ef99ec77773a6be05fbb8ee5cdb9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2bd860b7e752a51185960143cab9fec7bf32c84e 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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