CVE-2026-80881

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix buffer head management in ocfs2_read_blocks() In ocfs2_read_blocks(), caller should't assume that buffer head returned by 'sb_getblk()' is exclusively owned and so 'put_bh()' always drops b_count from 1 to 0. If it is not so, buffer head remains on hold and likely to be returned by the next call to 'sb_getblk()' unchanged - that is, with BH_Uptodate bit set even if it has failed validation previously, thus allowing to insert that buffer head into OCFS2 metadata cache and submit it to upper layers. To avoid such a scenario, BH_Uptodate should be cleared immediately after 'validate()' callback has detected some data inconsistency.

CVSS

No CVSS.

References

Link	Resource
https://git.kernel.org/stable/c/0e389fc290c350c67591abf4c367119f4689f310
https://git.kernel.org/stable/c/4ab17e328522a4df5fe0f0dcf39098118b1feeaa
https://git.kernel.org/stable/c/5927acb3e2c99985a14adecd9d1b67ba191c622d
https://git.kernel.org/stable/c/61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766
https://git.kernel.org/stable/c/6371a07148ee979af22a9d6f4c277462953a9a4a
https://git.kernel.org/stable/c/9e7a057934cdd58e4cc94350bcfe5367bbee0f8e
https://git.kernel.org/stable/c/a4eae1499c760949a93459d11390bd1fd823d31d
https://git.kernel.org/stable/c/ecb3f9386f4353034caef77239473c627232db17

Configurations

No configuration.

History

No history.

Information

Published : 2026-09-04 17:17

Updated : 2026-09-04 17:17

NVD link : CVE-2026-80881

Mitre link : CVE-2026-80881

CVE.ORG link : CVE-2026-80881

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-80881", "cveTags": [], "metrics": {}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "a4eae1499c760949a93459d11390bd1fd823d31d", "versionType": "git"}, {"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "4ab17e328522a4df5fe0f0dcf39098118b1feeaa", "versionType": "git"}, {"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "5927acb3e2c99985a14adecd9d1b67ba191c622d", "versionType": "git"}, {"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "ecb3f9386f4353034caef77239473c627232db17", "versionType": "git"}, {"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766", "versionType": "git"}, {"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "0e389fc290c350c67591abf4c367119f4689f310", "versionType": "git"}, {"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "9e7a057934cdd58e4cc94350bcfe5367bbee0f8e", "versionType": "git"}, {"status": "affected", "version": "cf76c78595ca87548ca5e45c862ac9e0949c4687", "lessThan": "6371a07148ee979af22a9d6f4c277462953a9a4a", "versionType": "git"}, {"status": "affected", "version": "01f93d5e36753fc4d06ec67f05ce78c9c6f2dd56", "versionType": "git"}, {"status": "affected", "version": "65cbd1279f4b999d56a838344a30642db24cd215", "versionType": "git"}, {"status": "affected", "version": "97e1db17bc1ef4c2e1789bc9323c7be44fba53f8", "versionType": "git"}, {"status": "affected", "version": "6c150df9c2e80b5cf86f5a0d98beb7390ad63bfc", "versionType": "git"}, {"status": "affected", "version": "4.4.204", "lessThan": "4.5", "versionType": "semver"}, {"status": "affected", "version": "4.9.204", "lessThan": "4.10", "versionType": "semver"}, {"status": "affected", "version": "4.14.157", "lessThan": "4.15", "versionType": "semver"}, {"status": "affected", "version": "4.19.87", "lessThan": "4.20", "versionType": "semver"}], "programFiles": ["fs/ocfs2/buffer_head_io.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.20"}, {"status": "unaffected", "version": "0", "lessThan": "4.20", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.261", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.212", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.178", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.145", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.97", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.40", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.5", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["fs/ocfs2/buffer_head_io.c"], "defaultStatus": "affected"}]}], "published": "2026-09-04T17:17:00.390", "references": [{"url": "https://git.kernel.org/stable/c/0e389fc290c350c67591abf4c367119f4689f310", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/4ab17e328522a4df5fe0f0dcf39098118b1feeaa", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5927acb3e2c99985a14adecd9d1b67ba191c622d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/61f7a5acb3bf8fc97dad78f54b1e8d0e1c819766", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/6371a07148ee979af22a9d6f4c277462953a9a4a", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/9e7a057934cdd58e4cc94350bcfe5367bbee0f8e", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/a4eae1499c760949a93459d11390bd1fd823d31d", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/ecb3f9386f4353034caef77239473c627232db17", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "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."}], "lastModified": "2026-09-04T17:17:00.390", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}