{"id":"CVE-2026-72099","state":"PUBLISHED","title":"dm-integrity: don't increment hash_offset twice","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: don't increment hash_offset twice\n\nhash_offset is already incremented in the loop \"for (i = 0; i < to_copy;\ni++, ts--)\". Do not increment it again.","publishedAt":"2026-08-15T05:52:44.292Z","updatedAt":"2026-10-19T21:19:27.671Z","severity":{"score":7.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"c66b1781a54984227e94b862be9328d81d81e51c","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"39697e2759ac23e65361fe61482f8174cad8a752","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"e6646f4d711d74930d39cce6fb7bfcae4cbee5fd","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"cf9feed8c131e303ecf2afebe6f791be018818ad","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"4f4e43337e9ef322595201cfc24def50fd624219","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"5dfd8042635278613da3b88553e25ade2103cd58","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"829476c06496aab018f14127c055adb164d1a750","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"edf025f083854f80032b73a1aad69a3c90db236f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["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":"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":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","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":["drivers/md/dm-integrity.c"]}],"references":["https://git.kernel.org/stable/c/c66b1781a54984227e94b862be9328d81d81e51c","https://git.kernel.org/stable/c/39697e2759ac23e65361fe61482f8174cad8a752","https://git.kernel.org/stable/c/e6646f4d711d74930d39cce6fb7bfcae4cbee5fd","https://git.kernel.org/stable/c/cf9feed8c131e303ecf2afebe6f791be018818ad","https://git.kernel.org/stable/c/4f4e43337e9ef322595201cfc24def50fd624219","https://git.kernel.org/stable/c/5dfd8042635278613da3b88553e25ade2103cd58","https://git.kernel.org/stable/c/829476c06496aab018f14127c055adb164d1a750","https://git.kernel.org/stable/c/edf025f083854f80032b73a1aad69a3c90db236f"],"weaknesses":["CWE-682"],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72099.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72099","state":"PUBLISHED","datePublished":"2026-08-15T05:52:44.292Z","dateUpdated":"2026-10-19T21:19:27.671Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.905Z"},"containers":{"cna":{"title":"dm-integrity: don't increment hash_offset twice","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-integrity: don't increment hash_offset twice\n\nhash_offset is already incremented in the loop \"for (i = 0; i < to_copy;\ni++, ts--)\". Do not increment it again."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"c66b1781a54984227e94b862be9328d81d81e51c","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"39697e2759ac23e65361fe61482f8174cad8a752","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"e6646f4d711d74930d39cce6fb7bfcae4cbee5fd","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"cf9feed8c131e303ecf2afebe6f791be018818ad","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"4f4e43337e9ef322595201cfc24def50fd624219","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"5dfd8042635278613da3b88553e25ade2103cd58","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"829476c06496aab018f14127c055adb164d1a750","versionType":"git"},{"version":"84597a44a9d86ac949900441cea7da0af0f2f473","status":"affected","lessThan":"edf025f083854f80032b73a1aad69a3c90db236f","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["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":"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":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","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":["drivers/md/dm-integrity.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c66b1781a54984227e94b862be9328d81d81e51c"},{"url":"https://git.kernel.org/stable/c/39697e2759ac23e65361fe61482f8174cad8a752"},{"url":"https://git.kernel.org/stable/c/e6646f4d711d74930d39cce6fb7bfcae4cbee5fd"},{"url":"https://git.kernel.org/stable/c/cf9feed8c131e303ecf2afebe6f791be018818ad"},{"url":"https://git.kernel.org/stable/c/4f4e43337e9ef322595201cfc24def50fd624219"},{"url":"https://git.kernel.org/stable/c/5dfd8042635278613da3b88553e25ade2103cd58"},{"url":"https://git.kernel.org/stable/c/829476c06496aab018f14127c055adb164d1a750"},{"url":"https://git.kernel.org/stable/c/edf025f083854f80032b73a1aad69a3c90db236f"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L","baseScore":7.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:N - The flaw is reached via block I/O on dm-integrity journal/bitmap targets; in enterprise/cloud deployments those volumes are commonly accessed remotely through NFS/ksmbd file exports or iSCSI/NVMe-oF/NBD block protocols, letting a remote client drive the vulnerable TAG_CMP path.\nAC:L - An attacker with read access can reliably trigger TAG_CMP by issuing ordinary multi-sector reads; when metadata tag comparisons span dm-bufio buffer boundaries the double-incremented hash_offset mispredicts tag boundaries without races or uncontrollable layout.\nPR:L - Table creation needs CAP_SYS_ADMIN (obtainable in a user namespace), but exploitation only requires read/write access to the mapped block device or an exported filesystem backed by it, not init-namespace root.\nUI:N - Exploitation requires only attacker-initiated reads or writes against the dm-integrity-backed storage; no additional victim actions such as mounting a filesystem or opening files beyond the attacker's own I/O are needed.\nS:U - Impact is incorrect integrity-tag verification within the host kernel's device-mapper layer, enabling undetected data tampering or spurious verification failures on the same host; it does not cross VM, container, or IOMMU security boundaries.\nC:N - The bug corrupts tag-boundary state during comparison but does not cause kernel memory disclosure, out-of-bounds reads, or use-after-free; any wrong data returned is attacker-supplied disk content, not leakage of unrelated kernel or user secrets.\nI:H - Misaligned hash_offset can accept integrity tags that should fail verification (including mixed hash/discard-filler boundaries), defeating dm-integrity's tamper detection and allowing undetected modification of protected block data.\nA:L - The same logic error can spuriously fail checksum verification on legitimate reads, returning I/O errors and denying access to protected data without kernel panic, though repeated reads can sustain a denial-of-service against the volume."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-23T12:46:49.483Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.10.266"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"5.15.217"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.1.184"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.7","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72099","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-16T15:51:53.051059Z"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-682","lang":"en","type":"CWE","description":"CWE-682 Incorrect Calculation"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-19T21:19:27.671Z"}}]}}}