{"id":"CVE-2026-89576","state":"PUBLISHED","title":"dm-era: fix shadowed superblock leak on take-snap failure","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-era: fix shadowed superblock leak on take-snap failure\n\nmetadata_take_snap() bumps the live superblock refcount and then\ndm_tm_shadow_block() allocates a new block for the metadata snapshot.\nIf the subsequent dm_sm_inc_block() of writeset_tree_root or\nera_array_root fails, the function only unlocks the clone and\nreturns.  The newly allocated shadow block is never returned to the\nmetadata space map, so each failed take-snap permanently leaks one\nmetadata block.\n\nFree the clone with dm_sm_dec_block() on those error paths, matching\nthe final step of metadata_drop_snap().","publishedAt":"2026-09-11T19:44:43.777Z","updatedAt":"2026-10-19T08:49:09.363Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"54dd21ca945ecc07885012b9f3e8197f091cfba0","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"ef00efb6fcaee88f50891279ceced17c614e97f7","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"e9fa68b89214bc65af0ef963af7ec3cce9f866e0","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"dc731d7fddfd6149f5e88ea080475d18c36d3c64","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"d66ceeefb87ddb097b0546bafc581380b816b048","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"36ff918637e3517f732188a3c39dbeae5b9cfb1b","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"6876ca330e741fb8886d12070cb6a7f9cb67257e","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-era-target.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","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":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/md/dm-era-target.c"]}],"references":["https://git.kernel.org/stable/c/54dd21ca945ecc07885012b9f3e8197f091cfba0","https://git.kernel.org/stable/c/ef00efb6fcaee88f50891279ceced17c614e97f7","https://git.kernel.org/stable/c/e9fa68b89214bc65af0ef963af7ec3cce9f866e0","https://git.kernel.org/stable/c/dc731d7fddfd6149f5e88ea080475d18c36d3c64","https://git.kernel.org/stable/c/d66ceeefb87ddb097b0546bafc581380b816b048","https://git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b","https://git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e","https://git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89576.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89576","state":"PUBLISHED","datePublished":"2026-09-11T19:44:43.777Z","dateUpdated":"2026-10-19T08:49:09.363Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.727Z"},"containers":{"cna":{"title":"dm-era: fix shadowed superblock leak on take-snap failure","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndm-era: fix shadowed superblock leak on take-snap failure\n\nmetadata_take_snap() bumps the live superblock refcount and then\ndm_tm_shadow_block() allocates a new block for the metadata snapshot.\nIf the subsequent dm_sm_inc_block() of writeset_tree_root or\nera_array_root fails, the function only unlocks the clone and\nreturns.  The newly allocated shadow block is never returned to the\nmetadata space map, so each failed take-snap permanently leaks one\nmetadata block.\n\nFree the clone with dm_sm_dec_block() on those error paths, matching\nthe final step of metadata_drop_snap()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"54dd21ca945ecc07885012b9f3e8197f091cfba0","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"ef00efb6fcaee88f50891279ceced17c614e97f7","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"e9fa68b89214bc65af0ef963af7ec3cce9f866e0","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"dc731d7fddfd6149f5e88ea080475d18c36d3c64","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"d66ceeefb87ddb097b0546bafc581380b816b048","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"36ff918637e3517f732188a3c39dbeae5b9cfb1b","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"6876ca330e741fb8886d12070cb6a7f9cb67257e","versionType":"git"},{"version":"eec40579d84873dfb7021eb24c50360f073237c5","status":"affected","lessThan":"39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/md/dm-era-target.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.15","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","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":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","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/md/dm-era-target.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/54dd21ca945ecc07885012b9f3e8197f091cfba0"},{"url":"https://git.kernel.org/stable/c/ef00efb6fcaee88f50891279ceced17c614e97f7"},{"url":"https://git.kernel.org/stable/c/e9fa68b89214bc65af0ef963af7ec3cce9f866e0"},{"url":"https://git.kernel.org/stable/c/dc731d7fddfd6149f5e88ea080475d18c36d3c64"},{"url":"https://git.kernel.org/stable/c/d66ceeefb87ddb097b0546bafc581380b816b048"},{"url":"https://git.kernel.org/stable/c/36ff918637e3517f732188a3c39dbeae5b9cfb1b"},{"url":"https://git.kernel.org/stable/c/6876ca330e741fb8886d12070cb6a7f9cb67257e"},{"url":"https://git.kernel.org/stable/c/39c5aa3bd8ec3912d2cd0b3fe092642b0d2b0713"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:49:09.363Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.15","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}