{"id":"CVE-2026-90333","state":"PUBLISHED","title":"dm-integrity: replace forgeable discard filler with a keyed sector marker","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: replace forgeable discard filler with a keyed sector marker\n\nThe discard-block check in dm_integrity_rw_tag() treats a stored tag\nof all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and\nskips HMAC verification. allow_discards is only accepted in\ndm-integrity's standalone mode. An attacker with raw write access to\nthe backing device, but without the integrity key, can stamp any block\nwith an all-0xf6 tag and have it served as authentic.\n\nAdd a new \"allow_discards_keyed\" target argument that marks discarded\nblocks with a keyed checksum of (salt || sector) instead, computed by\nintegrity_discard_checksum().","publishedAt":"2026-09-17T16:08:46.805Z","updatedAt":"2026-10-21T12:51:03.593Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"388c3f6496bb8083576d989e6d249ba9807c6b0b","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"6228722c27304e4682cddc1fede03898f87e4414","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"68c5c42567bc462139128968ebbfadd0aefff519","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/admin-guide/device-mapper/dm-ima.rst","Documentation/admin-guide/device-mapper/dm-integrity.rst","drivers/md/dm-integrity.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"6.12.114","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":["Documentation/admin-guide/device-mapper/dm-ima.rst","Documentation/admin-guide/device-mapper/dm-integrity.rst","drivers/md/dm-integrity.c"]}],"references":["https://git.kernel.org/stable/c/388c3f6496bb8083576d989e6d249ba9807c6b0b","https://git.kernel.org/stable/c/5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775","https://git.kernel.org/stable/c/6228722c27304e4682cddc1fede03898f87e4414","https://git.kernel.org/stable/c/68c5c42567bc462139128968ebbfadd0aefff519"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/90xxx/CVE-2026-90333.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-90333","state":"PUBLISHED","datePublished":"2026-09-17T16:08:46.805Z","dateUpdated":"2026-10-21T12:51:03.593Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.803Z"},"containers":{"cna":{"title":"dm-integrity: replace forgeable discard filler with a keyed sector marker","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: replace forgeable discard filler with a keyed sector marker\n\nThe discard-block check in dm_integrity_rw_tag() treats a stored tag\nof all 0xf6 bytes (DISCARD_FILLER) as proof a block was discarded and\nskips HMAC verification. allow_discards is only accepted in\ndm-integrity's standalone mode. An attacker with raw write access to\nthe backing device, but without the integrity key, can stamp any block\nwith an all-0xf6 tag and have it served as authentic.\n\nAdd a new \"allow_discards_keyed\" target argument that marks discarded\nblocks with a keyed checksum of (salt || sector) instead, computed by\nintegrity_discard_checksum()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"388c3f6496bb8083576d989e6d249ba9807c6b0b","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"6228722c27304e4682cddc1fede03898f87e4414","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"68c5c42567bc462139128968ebbfadd0aefff519","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["Documentation/admin-guide/device-mapper/dm-ima.rst","Documentation/admin-guide/device-mapper/dm-integrity.rst","drivers/md/dm-integrity.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.7","versionType":"semver"},{"version":"6.12.114","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":["Documentation/admin-guide/device-mapper/dm-ima.rst","Documentation/admin-guide/device-mapper/dm-integrity.rst","drivers/md/dm-integrity.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/388c3f6496bb8083576d989e6d249ba9807c6b0b"},{"url":"https://git.kernel.org/stable/c/5c58ea19a909ef6bed4f0f824e9cd7e30d7e4775"},{"url":"https://git.kernel.org/stable/c/6228722c27304e4682cddc1fede03898f87e4414"},{"url":"https://git.kernel.org/stable/c/68c5c42567bc462139128968ebbfadd0aefff519"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:51:03.593Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.12.114"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.18.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.2.6"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}