{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2024-40952", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-40952", "idYear": 2024, "status": "PUBLISHED", "publishedAt": "2024-07-12T12:31:56.160Z", "updatedAt": "2026-05-11T20:23:00.265Z", "importedAt": "2026-10-24T01:57:16.009Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "ocfs2: fix NULL pointer dereference in ocfs2_journal_dirty()", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix NULL pointer dereference in ocfs2_journal_dirty()\n\nbdev->bd_super has been removed and commit 8887b94d9322 change the usage\nfrom bdev->bd_super to b_assoc_map->host->i_sb. This introduces the\nfollowing NULL pointer dereference in ocfs2_journal_dirty() since\nb_assoc_map is still not initialized. This can be easily reproduced by\nrunning xfstests generic/186, which simulate no more credits.\n\n[ 134.351592] BUG: kernel NULL pointer dereference, address: 0000000000000000\n...\n[ 134.355341] RIP: 0010:ocfs2_journal_dirty+0x14f/0x160 [ocfs2]\n...\n[ 134.365071] Call Trace:\n[ 134.365312] \n[ 134.365524] ? __die_body+0x1e/0x60\n[ 134.365868] ? page_fault_oops+0x13d/0x4f0\n[ 134.366265] ? __pfx_bit_wait_io+0x10/0x10\n[ 134.366659] ? schedule+0x27/0xb0\n[ 134.366981] ? exc_page_fault+0x6a/0x140\n[ 134.367356] ? asm_exc_page_fault+0x26/0x30\n[ 134.367762] ? ocfs2_journal_dirty+0x14f/0x160 [ocfs2]\n[ 134.368305] ? ocfs2_journal_dirty+0x13d/0x160 [ocfs2]\n[ 134.368837] ocfs2_create_new_meta_bhs.isra.51+0x139/0x2e0 [ocfs2]\n[ 134.369454] ocfs2_grow_tree+0x688/0x8a0 [ocfs2]\n[ 134.369927] ocfs2_split_and_insert.isra.67+0x35c/0x4a0 [ocfs2]\n[ 134.370521] ocfs2_split_extent+0x314/0x4d0 [ocfs2]\n[ 134.371019] ocfs2_change_extent_flag+0x174/0x410 [ocfs2]\n[ 134.371566] ocfs2_add_refcount_flag+0x3fa/0x630 [ocfs2]\n[ 134.372117] ocfs2_reflink_remap_extent+0x21b/0x4c0 [ocfs2]\n[ 134.372994] ? inode_update_timestamps+0x4a/0x120\n[ 134.373692] ? __pfx_ocfs2_journal_access_di+0x10/0x10 [ocfs2]\n[ 134.374545] ? __pfx_ocfs2_journal_access_di+0x10/0x10 [ocfs2]\n[ 134.375393] ocfs2_reflink_remap_blocks+0xe4/0x4e0 [ocfs2]\n[ 134.376197] ocfs2_remap_file_range+0x1de/0x390 [ocfs2]\n[ 134.376971] ? security_file_permission+0x29/0x50\n[ 134.377644] vfs_clone_file_range+0xfe/0x320\n[ 134.378268] ioctl_file_clone+0x45/0xa0\n[ 134.378853] do_vfs_ioctl+0x457/0x990\n[ 134.379422] __x64_sys_ioctl+0x6e/0xd0\n[ 134.379987] do_syscall_64+0x5d/0x170\n[ 134.380550] entry_SYSCALL_64_after_hwframe+0x76/0x7e\n[ 134.381231] RIP: 0033:0x7fa4926397cb\n[ 134.381786] Code: 73 01 c3 48 8b 0d bd 56 38 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 8d 56 38 00 f7 d8 64 89 01 48\n[ 134.383930] RSP: 002b:00007ffc2b39f7b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\n[ 134.384854] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007fa4926397cb\n[ 134.385734] RDX: 00007ffc2b39f7f0 RSI: 000000004020940d RDI: 0000000000000003\n[ 134.386606] RBP: 0000000000000000 R08: 00111a82a4f015bb R09: 00007fa494221000\n[ 134.387476] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\n[ 134.388342] R13: 0000000000f10000 R14: 0000558e844e2ac8 R15: 0000000000f10000\n[ 134.389207] \n\nFix it by only aborting transaction and journal in ocfs2_journal_dirty()\nnow, and leave ocfs2_abort() later when detecting an aborted handle,\ne.g. start next transaction. Also log the handle details in this case.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "8887b94d93224e0ef7e1bc6369640e313b8b12f4", "status": "affected", "versionType": "git", "lessThan": "0550ad87711f815b3d73e487ec58ca7d8f56edbc" }, { "version": "8887b94d93224e0ef7e1bc6369640e313b8b12f4", "status": "affected", "versionType": "git", "lessThan": "72663d3e09091f431a0774227ca207c0358362dd" }, { "version": "8887b94d93224e0ef7e1bc6369640e313b8b12f4", "status": "affected", "versionType": "git", "lessThan": "58f7e1e2c9e72c7974054c64c3abeac81c11f822" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.6", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.6" }, { "version": "6.6.36", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.9.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.9.*" }, { "version": "6.10", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }