{"id":"CVE-2026-93073","state":"PUBLISHED","title":"dax: read holder_ops once in dax_holder_notify_failure()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndax: read holder_ops once in dax_holder_notify_failure()\n\ndax_holder_notify_failure() reads dax_dev->holder_ops twice without\nREAD_ONCE() -- once for the NULL check and once for the indirect\nnotify_failure() call. A concurrent fs_put_dax() can clear holder_ops\nbetween the two reads, so the check can observe a non-NULL pointer while\nthe call dereferences NULL. (kill_dax() also clears holder_ops, but only\nafter synchronize_srcu(), so it cannot race a reader that is inside\ndax_read_lock(); fs_put_dax() does no such synchronization.)\n\nFetch holder_ops once into a local with READ_ONCE() so the NULL check and\nthe indirect call observe the same value.","publishedAt":"2026-09-17T16:10:56.405Z","updatedAt":"2026-10-19T09:05:09.113Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"1661b9bf78def01a8c96409569772d9b2592f4ba","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"0a42180d5410c98829ee72d1d426fb7faf9e6873","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"ee1251621d1c7cf3155c6704542cbb358d799968","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"6a37acecc7c29136235cbc446a1b89e81414344b","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"eb412f80311fc7ab6eb3203091a3fe59a5e9fd30","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"7ae9d15bdcde0f2955ae13b6a95587f9e23b2359","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/super.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/super.c"]}],"references":["https://git.kernel.org/stable/c/1661b9bf78def01a8c96409569772d9b2592f4ba","https://git.kernel.org/stable/c/0a42180d5410c98829ee72d1d426fb7faf9e6873","https://git.kernel.org/stable/c/ee1251621d1c7cf3155c6704542cbb358d799968","https://git.kernel.org/stable/c/6a37acecc7c29136235cbc446a1b89e81414344b","https://git.kernel.org/stable/c/eb412f80311fc7ab6eb3203091a3fe59a5e9fd30","https://git.kernel.org/stable/c/7ae9d15bdcde0f2955ae13b6a95587f9e23b2359"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93073.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93073","state":"PUBLISHED","datePublished":"2026-09-17T16:10:56.405Z","dateUpdated":"2026-10-19T09:05:09.113Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-17T15:57:05.661Z"},"containers":{"cna":{"title":"dax: read holder_ops once in dax_holder_notify_failure()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndax: read holder_ops once in dax_holder_notify_failure()\n\ndax_holder_notify_failure() reads dax_dev->holder_ops twice without\nREAD_ONCE() -- once for the NULL check and once for the indirect\nnotify_failure() call. A concurrent fs_put_dax() can clear holder_ops\nbetween the two reads, so the check can observe a non-NULL pointer while\nthe call dereferences NULL. (kill_dax() also clears holder_ops, but only\nafter synchronize_srcu(), so it cannot race a reader that is inside\ndax_read_lock(); fs_put_dax() does no such synchronization.)\n\nFetch holder_ops once into a local with READ_ONCE() so the NULL check and\nthe indirect call observe the same value."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"1661b9bf78def01a8c96409569772d9b2592f4ba","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"0a42180d5410c98829ee72d1d426fb7faf9e6873","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"ee1251621d1c7cf3155c6704542cbb358d799968","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"6a37acecc7c29136235cbc446a1b89e81414344b","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"eb412f80311fc7ab6eb3203091a3fe59a5e9fd30","versionType":"git"},{"version":"8012b866085523758780850087102421dbcce522","status":"affected","lessThan":"7ae9d15bdcde0f2955ae13b6a95587f9e23b2359","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/super.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.52","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.6","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/dax/super.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/1661b9bf78def01a8c96409569772d9b2592f4ba"},{"url":"https://git.kernel.org/stable/c/0a42180d5410c98829ee72d1d426fb7faf9e6873"},{"url":"https://git.kernel.org/stable/c/ee1251621d1c7cf3155c6704542cbb358d799968"},{"url":"https://git.kernel.org/stable/c/6a37acecc7c29136235cbc446a1b89e81414344b"},{"url":"https://git.kernel.org/stable/c/eb412f80311fc7ab6eb3203091a3fe59a5e9fd30"},{"url":"https://git.kernel.org/stable/c/7ae9d15bdcde0f2955ae13b6a95587f9e23b2359"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:05:09.113Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}