{"id":"CVE-2026-80881","state":"PUBLISHED","title":"ocfs2: fix buffer head management in ocfs2_read_blocks()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix buffer head management in ocfs2_read_blocks()\n\nIn ocfs2_read_blocks(), caller should't assume that buffer head returned\nby 'sb_getblk()' is exclusively owned and so 'put_bh()' always drops\nb_count from 1 to 0.  If it is not so, buffer head remains on hold and\nlikely to be returned by the next call to 'sb_getblk()' unchanged - that\nis, with BH_Uptodate bit set even if it has failed validation previously,\nthus allowing to insert that buffer head into OCFS2 metadata cache and\nsubmit it to upper layers.  To avoid such a scenario, BH_Uptodate should\nbe cleared immediately after 'validate()' callback has detected some data\ninconsistency.","publishedAt":"2026-09-04T16:49:11.758Z","updatedAt":"2026-09-04T16:49:11.758Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"a4eae1499c760949a93459d11390bd1fd823d31d","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"4ab17e328522a4df5fe0f0dcf39098118b1feeaa","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"5927acb3e2c99985a14adecd9d1b67ba191c622d","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"ecb3f9386f4353034caef77239473c627232db17","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"0e389fc290c350c67591abf4c367119f4689f310","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"9e7a057934cdd58e4cc94350bcfe5367bbee0f8e","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"6371a07148ee979af22a9d6f4c277462953a9a4a","versionType":"git"},{"version":"01f93d5e36753fc4d06ec67f05ce78c9c6f2dd56","status":"affected","versionType":"git"},{"version":"65cbd1279f4b999d56a838344a30642db24cd215","status":"affected","versionType":"git"},{"version":"97e1db17bc1ef4c2e1789bc9323c7be44fba53f8","status":"affected","versionType":"git"},{"version":"6c150df9c2e80b5cf86f5a0d98beb7390ad63bfc","status":"affected","versionType":"git"},{"version":"4.4.204","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.9.204","status":"affected","lessThan":"4.10","versionType":"semver"},{"version":"4.14.157","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.87","status":"affected","lessThan":"4.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/buffer_head_io.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","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":["fs/ocfs2/buffer_head_io.c"]}],"references":["https://git.kernel.org/stable/c/a4eae1499c760949a93459d11390bd1fd823d31d","https://git.kernel.org/stable/c/4ab17e328522a4df5fe0f0dcf39098118b1feeaa","https://git.kernel.org/stable/c/5927acb3e2c99985a14adecd9d1b67ba191c622d","https://git.kernel.org/stable/c/ecb3f9386f4353034caef77239473c627232db17","https://git.kernel.org/stable/c/61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766","https://git.kernel.org/stable/c/0e389fc290c350c67591abf4c367119f4689f310","https://git.kernel.org/stable/c/9e7a057934cdd58e4cc94350bcfe5367bbee0f8e","https://git.kernel.org/stable/c/6371a07148ee979af22a9d6f4c277462953a9a4a"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80881.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80881","state":"PUBLISHED","datePublished":"2026-09-04T16:49:11.758Z","dateUpdated":"2026-09-04T16:49:11.758Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.799Z"},"containers":{"cna":{"title":"ocfs2: fix buffer head management in ocfs2_read_blocks()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix buffer head management in ocfs2_read_blocks()\n\nIn ocfs2_read_blocks(), caller should't assume that buffer head returned\nby 'sb_getblk()' is exclusively owned and so 'put_bh()' always drops\nb_count from 1 to 0.  If it is not so, buffer head remains on hold and\nlikely to be returned by the next call to 'sb_getblk()' unchanged - that\nis, with BH_Uptodate bit set even if it has failed validation previously,\nthus allowing to insert that buffer head into OCFS2 metadata cache and\nsubmit it to upper layers.  To avoid such a scenario, BH_Uptodate should\nbe cleared immediately after 'validate()' callback has detected some data\ninconsistency."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"a4eae1499c760949a93459d11390bd1fd823d31d","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"4ab17e328522a4df5fe0f0dcf39098118b1feeaa","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"5927acb3e2c99985a14adecd9d1b67ba191c622d","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"ecb3f9386f4353034caef77239473c627232db17","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"0e389fc290c350c67591abf4c367119f4689f310","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"9e7a057934cdd58e4cc94350bcfe5367bbee0f8e","versionType":"git"},{"version":"cf76c78595ca87548ca5e45c862ac9e0949c4687","status":"affected","lessThan":"6371a07148ee979af22a9d6f4c277462953a9a4a","versionType":"git"},{"version":"01f93d5e36753fc4d06ec67f05ce78c9c6f2dd56","status":"affected","versionType":"git"},{"version":"65cbd1279f4b999d56a838344a30642db24cd215","status":"affected","versionType":"git"},{"version":"97e1db17bc1ef4c2e1789bc9323c7be44fba53f8","status":"affected","versionType":"git"},{"version":"6c150df9c2e80b5cf86f5a0d98beb7390ad63bfc","status":"affected","versionType":"git"},{"version":"4.4.204","status":"affected","lessThan":"4.5","versionType":"semver"},{"version":"4.9.204","status":"affected","lessThan":"4.10","versionType":"semver"},{"version":"4.14.157","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.87","status":"affected","lessThan":"4.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/ocfs2/buffer_head_io.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.20","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.20","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","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":["fs/ocfs2/buffer_head_io.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/a4eae1499c760949a93459d11390bd1fd823d31d"},{"url":"https://git.kernel.org/stable/c/4ab17e328522a4df5fe0f0dcf39098118b1feeaa"},{"url":"https://git.kernel.org/stable/c/5927acb3e2c99985a14adecd9d1b67ba191c622d"},{"url":"https://git.kernel.org/stable/c/ecb3f9386f4353034caef77239473c627232db17"},{"url":"https://git.kernel.org/stable/c/61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766"},{"url":"https://git.kernel.org/stable/c/0e389fc290c350c67591abf4c367119f4689f310"},{"url":"https://git.kernel.org/stable/c/9e7a057934cdd58e4cc94350bcfe5367bbee0f8e"},{"url":"https://git.kernel.org/stable/c/6371a07148ee979af22a9d6f4c277462953a9a4a"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-09-04T16:49:11.758Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.20","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel: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