{"id":"CVE-2026-89567","state":"PUBLISHED","title":"jbd2: bound shrinker scans by examined checkpoint buffers","description":"In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: bound shrinker scans by examined checkpoint buffers\n\nThe jbd2 shrinker currently accounts only checkpoint buffers that it\nsuccessfully releases against nr_to_scan.  Busy buffers therefore do not\nconsume the scan budget.\n\nIf a checkpoint transaction contains mostly busy buffers, the shrinker\ncan scan its entire checkpoint list while holding journal->j_list_lock.\nLarge checkpoint lists can result in excessive lock hold times and leave\nother CPUs spinning on j_list_lock, causing soft lockups or RCU stalls.\n\nPass nr_to_scan into journal_shrink_one_cp_list() and decrement it for\nevery buffer examined, including busy buffers.  Pass NULL from checkpoint\ncleanup paths so their existing full-list behavior is preserved.\n\nThis restores the scan-budget semantics that existed before\njournal_shrink_one_cp_list() was changed to always scan a complete\ncheckpoint list.","publishedAt":"2026-09-11T19:44:37.332Z","updatedAt":"2026-10-21T12:47:54.662Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"6b5366ba63a58819396045ab146bd37ff9e503c6","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"edf5fcd0469b7467bd5b37a79502c8d9c3257dbb","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"71c6b872c746465fa4b5def239cb296173ca8216","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"c2c0fb364685b8996c357d3b050394959b29d6e0","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"15cb16496446b94e67f7abcb049b8e2c75cd3d02","versionType":"git"},{"version":"9c31bb2684f8035beca0275349d19d679b679ffb","status":"affected","versionType":"git"},{"version":"5fda50e262e65bd553ff777c4b280afd1495a18b","status":"affected","versionType":"git"},{"version":"557fda9ed70ebf8eda2620ba3d746215285a1303","status":"affected","versionType":"git"},{"version":"5.15.129","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.50","status":"affected","lessThan":"6.2","versionType":"semver"},{"version":"6.4.13","status":"affected","lessThan":"6.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/jbd2/checkpoint.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.6.160","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":["fs/jbd2/checkpoint.c"]}],"references":["https://git.kernel.org/stable/c/6b5366ba63a58819396045ab146bd37ff9e503c6","https://git.kernel.org/stable/c/edf5fcd0469b7467bd5b37a79502c8d9c3257dbb","https://git.kernel.org/stable/c/71c6b872c746465fa4b5def239cb296173ca8216","https://git.kernel.org/stable/c/c2c0fb364685b8996c357d3b050394959b29d6e0","https://git.kernel.org/stable/c/15cb16496446b94e67f7abcb049b8e2c75cd3d02"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89567.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89567","state":"PUBLISHED","datePublished":"2026-09-11T19:44:37.332Z","dateUpdated":"2026-10-21T12:47:54.662Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.726Z"},"containers":{"cna":{"title":"jbd2: bound shrinker scans by examined checkpoint buffers","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\njbd2: bound shrinker scans by examined checkpoint buffers\n\nThe jbd2 shrinker currently accounts only checkpoint buffers that it\nsuccessfully releases against nr_to_scan.  Busy buffers therefore do not\nconsume the scan budget.\n\nIf a checkpoint transaction contains mostly busy buffers, the shrinker\ncan scan its entire checkpoint list while holding journal->j_list_lock.\nLarge checkpoint lists can result in excessive lock hold times and leave\nother CPUs spinning on j_list_lock, causing soft lockups or RCU stalls.\n\nPass nr_to_scan into journal_shrink_one_cp_list() and decrement it for\nevery buffer examined, including busy buffers.  Pass NULL from checkpoint\ncleanup paths so their existing full-list behavior is preserved.\n\nThis restores the scan-budget semantics that existed before\njournal_shrink_one_cp_list() was changed to always scan a complete\ncheckpoint list."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"6b5366ba63a58819396045ab146bd37ff9e503c6","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"edf5fcd0469b7467bd5b37a79502c8d9c3257dbb","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"71c6b872c746465fa4b5def239cb296173ca8216","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"c2c0fb364685b8996c357d3b050394959b29d6e0","versionType":"git"},{"version":"b98dba273a0e47dbfade89c9af73c5b012a4eabb","status":"affected","lessThan":"15cb16496446b94e67f7abcb049b8e2c75cd3d02","versionType":"git"},{"version":"9c31bb2684f8035beca0275349d19d679b679ffb","status":"affected","versionType":"git"},{"version":"5fda50e262e65bd553ff777c4b280afd1495a18b","status":"affected","versionType":"git"},{"version":"557fda9ed70ebf8eda2620ba3d746215285a1303","status":"affected","versionType":"git"},{"version":"5.15.129","status":"affected","lessThan":"5.16","versionType":"semver"},{"version":"6.1.50","status":"affected","lessThan":"6.2","versionType":"semver"},{"version":"6.4.13","status":"affected","lessThan":"6.5","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/jbd2/checkpoint.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.5","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.5","versionType":"semver"},{"version":"6.6.160","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":["fs/jbd2/checkpoint.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/6b5366ba63a58819396045ab146bd37ff9e503c6"},{"url":"https://git.kernel.org/stable/c/edf5fcd0469b7467bd5b37a79502c8d9c3257dbb"},{"url":"https://git.kernel.org/stable/c/71c6b872c746465fa4b5def239cb296173ca8216"},{"url":"https://git.kernel.org/stable/c/c2c0fb364685b8996c357d3b050394959b29d6e0"},{"url":"https://git.kernel.org/stable/c/15cb16496446b94e67f7abcb049b8e2c75cd3d02"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-21T12:47:54.662Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.5","versionEndExcluding":"7.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.129"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.1.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.4.13"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}