{"id":"CVE-2026-89567","revision":"6901ce9e91624137a8caa3a1cad00de6","records":[{"revision":"6901ce9e91624137a8caa3a1cad00de6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89567","aliases":[],"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.","state":0,"publishedAt":"2026-09-11T19:44:37.332+00:00","modifiedAt":"2026-10-21T12:47:54.662+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/jbd2/checkpoint.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"b98dba273a0e47dbfade89c9af73c5b012a4eabb\",\n                            \"lessThan\": \"6b5366ba63a58819396045ab146bd37ff9e503c6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b98dba273a0e47dbfade89c9af73c5b012a4eabb\",\n                            \"lessThan\": \"edf5fcd0469b7467bd5b37a79502c8d9c3257dbb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b98dba273a0e47dbfade89c9af73c5b012a4eabb\",\n                            \"lessThan\": \"71c6b872c746465fa4b5def239cb296173ca8216\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b98dba273a0e47dbfade89c9af73c5b012a4eabb\",\n                            \"lessThan\": \"c2c0fb364685b8996c357d3b050394959b29d6e0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"b98dba273a0e47dbfade89c9af73c5b012a4eabb\",\n                            \"lessThan\": \"15cb16496446b94e67f7abcb049b8e2c75cd3d02\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"9c31bb2684f8035beca0275349d19d679b679ffb\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5fda50e262e65bd553ff777c4b280afd1495a18b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"557fda9ed70ebf8eda2620ba3d746215285a1303\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"5.15.129\",\n                            \"lessThan\": \"5.16\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.50\",\n                            \"lessThan\": \"6.2\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.4.13\",\n                            \"lessThan\": \"6.5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"semver\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"fs/jbd2/checkpoint.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.5\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.5\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.160\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.109\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.50\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.4\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"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"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89567","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89567","identifiers":["CVE-2026-89567"]},"retained":false,"historicalAffected":[]}],"coverage":[]}