{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-31598", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.121Z", "datePublished": "2026-04-24T14:42:23.304Z", "dateUpdated": "2026-08-05T12:23:42.417Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:23:42.417Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix possible deadlock between unlink and dio_end_io_write\n\nocfs2_unlink takes orphan dir inode_lock first and then ip_alloc_sem,\nwhile in ocfs2_dio_end_io_write, it acquires these locks in reverse order.\nThis creates an ABBA lock ordering violation on lock classes\nocfs2_sysfile_lock_key[ORPHAN_DIR_SYSTEM_INODE] and\nocfs2_file_ip_alloc_sem_key.\n\nLock Chain #0 (orphan dir inode_lock -> ip_alloc_sem):\nocfs2_unlink\n ocfs2_prepare_orphan_dir\n ocfs2_lookup_lock_orphan_dir\n inode_lock(orphan_dir_inode) <- lock A\n __ocfs2_prepare_orphan_dir\n ocfs2_prepare_dir_for_insert\n ocfs2_extend_dir\n\t ocfs2_expand_inline_dir\n\t down_write(&oi->ip_alloc_sem) <- Lock B\n\nLock Chain #1 (ip_alloc_sem -> orphan dir inode_lock):\nocfs2_dio_end_io_write\n down_write(&oi->ip_alloc_sem) <- Lock B\n ocfs2_del_inode_from_orphan()\n inode_lock(orphan_dir_inode) <- Lock A\n\nDeadlock Scenario:\n CPU0 (unlink) CPU1 (dio_end_io_write)\n ------ ------\n inode_lock(orphan_dir_inode)\n down_write(ip_alloc_sem)\n down_write(ip_alloc_sem)\n inode_lock(orphan_dir_inode)\n\nSince ip_alloc_sem is to protect allocation changes, which is unrelated\nwith operations in ocfs2_del_inode_from_orphan. So move\nocfs2_del_inode_from_orphan out of ip_alloc_sem to fix the deadlock." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - Although the core bug is in ocfs2 filesystem code, ocfs2 is exportable and nfsd can issue direct writes with IOCB_DIRECT while remote REMOVE operations reach vfs_unlink, making the vulnerable lock chains reachable over the network on a writable exported ocfs2 volume.\nAC:L - The bug is an ABBA deadlock where the attacker can drive both sides with concurrent extending direct writes and unlink/remove operations. Once the target deployment exposes those operations, winning the race is attacker-controlled.\nPR:N - A remote NFS client can trigger the operations through an exported writable share without kernel capabilities on the target. In permissive or anonymous export scenarios, no prior authenticated privileges are required.\nUI:N - No victim user action is required after the vulnerable service/filesystem is available. The attacker can send the write and remove operations directly.\nS:U - The impact remains within the same kernel/filesystem security authority. There is no VM escape, sandbox boundary crossing, or separate security scope.\nC:N - The issue is a lock-ordering deadlock, not memory corruption or information disclosure. It does not provide a read primitive or leak data.\nI:N - The vulnerable behavior does not corrupt memory or allow unauthorized data modification. It only causes threads to block on locks.\nA:H - The deadlock can permanently hang ocfs2 operations and affected kernel worker/syscall contexts. A kernel/filesystem hang is a high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ocfs2/aops.c" ], "versions": [ { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "297d8d7bb6a2bf133d3a3636edbdf94101cbd719", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "32630dee18c6bb2175c8a865a474749492eaf19c", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "93f35419eb84d58820040642cb6e7528fe4aba7a", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "4b80b5a838a32437f2cae0662578bac216a2c51a", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "2b884d52273c60c298bd570163e8053657bbaff6", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "bc0fb5c7d54c78be43a536df0e20dee32adb27d3", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "f9fb1a7b635849322e1d7b7b6b26389778ec8e82", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "e049f7a9bd80b7319590789ea5e1c523d6339d91", "status": "affected", "versionType": "git" }, { "version": "a86a72a4a4e0ec109a98e2737948864ed6794bf7", "lessThan": "b02da26a992db0c0e2559acbda0fc48d4a2fd337", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/ocfs2/aops.c" ], "versions": [ { "version": "4.6", "status": "affected" }, { "version": "0", "lessThan": "4.6", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.258", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.136", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.83", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.24", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.14", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.1", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.10.258" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.6.136" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.12.83" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.18.24" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "6.19.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.0.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.6", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/297d8d7bb6a2bf133d3a3636edbdf94101cbd719" }, { "url": "https://git.kernel.org/stable/c/32630dee18c6bb2175c8a865a474749492eaf19c" }, { "url": "https://git.kernel.org/stable/c/93f35419eb84d58820040642cb6e7528fe4aba7a" }, { "url": "https://git.kernel.org/stable/c/4b80b5a838a32437f2cae0662578bac216a2c51a" }, { "url": "https://git.kernel.org/stable/c/2b884d52273c60c298bd570163e8053657bbaff6" }, { "url": "https://git.kernel.org/stable/c/bc0fb5c7d54c78be43a536df0e20dee32adb27d3" }, { "url": "https://git.kernel.org/stable/c/f9fb1a7b635849322e1d7b7b6b26389778ec8e82" }, { "url": "https://git.kernel.org/stable/c/e049f7a9bd80b7319590789ea5e1c523d6339d91" }, { "url": "https://git.kernel.org/stable/c/b02da26a992db0c0e2559acbda0fc48d4a2fd337" } ], "title": "ocfs2: fix possible deadlock between unlink and dio_end_io_write", "x_generator": { "engine": "bippy-1.2.0" } } } }