{"id":"CVE-2026-74487","state":"PUBLISHED","title":"binfmt_misc: restore write access when removing an entry","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: restore write access when removing an entry\n\nRegistering an entry with the MISC_FMT_OPEN_FILE flag opens the\ninterpreter via open_exec() which denies write access to it for as\nlong as the entry exists. Removing the entry closes the interpreter\nfile via filp_close() but never restores write access, leaving the\ninode's i_writecount permanently negative. Opening the interpreter\nfor writing keeps failing with ETXTBSY long after the entry is gone\nuntil the inode is evicted from the inode cache.\n\nCommit 90f601b497d7 (\"binfmt_misc: restore write access before\nclosing files opened by open_exec()\") fixed the same imbalance in the\nerror path of bm_register_write() but the actual removal path has\nbeen leaking the write denial since the introduction of the flag.\n\nRestore write access in put_binfmt_handler() before closing the\ninterpreter file.","publishedAt":"2026-08-15T12:27:18.236Z","updatedAt":"2026-08-23T12:47:26.657Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"7873f987213695e3564c8c259e6db283e4739472","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"13efc628fdf641d901bdba07caa1c558e1bed046","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"f1cf67f6be0babc73afa4ee0e27bdedffeeeb095","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"fdc1d702bf3001586221fa07e598e876a0a854c5","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"3b522487a3a9162b1b519eefde7998d103e3e07b","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"db1856ea9196cf6e015d12199a34c0b9313c7bfa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/binfmt_misc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.184","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.153","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.105","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/binfmt_misc.c"]}],"references":["https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472","https://git.kernel.org/stable/c/13efc628fdf641d901bdba07caa1c558e1bed046","https://git.kernel.org/stable/c/f1cf67f6be0babc73afa4ee0e27bdedffeeeb095","https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c","https://git.kernel.org/stable/c/a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8","https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5","https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b","https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/74xxx/CVE-2026-74487.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-74487","state":"PUBLISHED","datePublished":"2026-08-15T12:27:18.236Z","dateUpdated":"2026-08-23T12:47:26.657Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-15T05:44:03.905Z"},"containers":{"cna":{"title":"binfmt_misc: restore write access when removing an entry","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: restore write access when removing an entry\n\nRegistering an entry with the MISC_FMT_OPEN_FILE flag opens the\ninterpreter via open_exec() which denies write access to it for as\nlong as the entry exists. Removing the entry closes the interpreter\nfile via filp_close() but never restores write access, leaving the\ninode's i_writecount permanently negative. Opening the interpreter\nfor writing keeps failing with ETXTBSY long after the entry is gone\nuntil the inode is evicted from the inode cache.\n\nCommit 90f601b497d7 (\"binfmt_misc: restore write access before\nclosing files opened by open_exec()\") fixed the same imbalance in the\nerror path of bm_register_write() but the actual removal path has\nbeen leaking the write denial since the introduction of the flag.\n\nRestore write access in put_binfmt_handler() before closing the\ninterpreter file."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"7873f987213695e3564c8c259e6db283e4739472","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"13efc628fdf641d901bdba07caa1c558e1bed046","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"f1cf67f6be0babc73afa4ee0e27bdedffeeeb095","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"fdc1d702bf3001586221fa07e598e876a0a854c5","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"3b522487a3a9162b1b519eefde7998d103e3e07b","versionType":"git"},{"version":"948b701a607f123df92ed29084413e5dd8cda2ed","status":"affected","lessThan":"db1856ea9196cf6e015d12199a34c0b9313c7bfa","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/binfmt_misc.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"5.10.266","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.217","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.184","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.153","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.105","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.44","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.8","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/binfmt_misc.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/7873f987213695e3564c8c259e6db283e4739472"},{"url":"https://git.kernel.org/stable/c/13efc628fdf641d901bdba07caa1c558e1bed046"},{"url":"https://git.kernel.org/stable/c/f1cf67f6be0babc73afa4ee0e27bdedffeeeb095"},{"url":"https://git.kernel.org/stable/c/dd9ba32169e73a3c3ba595cf1de1f4c69ceafb3c"},{"url":"https://git.kernel.org/stable/c/a50296cca2a1db9d8d21051e7d50f0cf3a4b7ec8"},{"url":"https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5"},{"url":"https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b"},{"url":"https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-23T12:47:26.657Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"5.15.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.184"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.153"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.12.105"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.18.44"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.1.8"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}