{ "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-2023-53317", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53317", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-09-16T16:11:53.877Z", "updatedAt": "2026-05-11T19:42:36.536Z", "importedAt": "2026-10-24T01:57:03.413Z", "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": "ext4: fix WARNING in mb_find_extent", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix WARNING in mb_find_extent\n\nSyzbot found the following issue:\n\nEXT4-fs: Warning: mounting with data=journal disables delayed allocation, dioread_nolock, O_DIRECT and fast_commit support!\nEXT4-fs (loop0): orphan cleanup on readonly fs\n------------[ cut here ]------------\nWARNING: CPU: 1 PID: 5067 at fs/ext4/mballoc.c:1869 mb_find_extent+0x8a1/0xe30\nModules linked in:\nCPU: 1 PID: 5067 Comm: syz-executor307 Not tainted 6.2.0-rc1-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nRIP: 0010:mb_find_extent+0x8a1/0xe30 fs/ext4/mballoc.c:1869\nRSP: 0018:ffffc90003c9e098 EFLAGS: 00010293\nRAX: ffffffff82405731 RBX: 0000000000000041 RCX: ffff8880783457c0\nRDX: 0000000000000000 RSI: 0000000000000041 RDI: 0000000000000040\nRBP: 0000000000000040 R08: ffffffff82405723 R09: ffffed10053c9402\nR10: ffffed10053c9402 R11: 1ffff110053c9401 R12: 0000000000000000\nR13: ffffc90003c9e538 R14: dffffc0000000000 R15: ffffc90003c9e2cc\nFS: 0000555556665300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000056312f6796f8 CR3: 0000000022437000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n \n ext4_mb_complex_scan_group+0x353/0x1100 fs/ext4/mballoc.c:2307\n ext4_mb_regular_allocator+0x1533/0x3860 fs/ext4/mballoc.c:2735\n ext4_mb_new_blocks+0xddf/0x3db0 fs/ext4/mballoc.c:5605\n ext4_ext_map_blocks+0x1868/0x6880 fs/ext4/extents.c:4286\n ext4_map_blocks+0xa49/0x1cc0 fs/ext4/inode.c:651\n ext4_getblk+0x1b9/0x770 fs/ext4/inode.c:864\n ext4_bread+0x2a/0x170 fs/ext4/inode.c:920\n ext4_quota_write+0x225/0x570 fs/ext4/super.c:7105\n write_blk fs/quota/quota_tree.c:64 [inline]\n get_free_dqblk+0x34a/0x6d0 fs/quota/quota_tree.c:130\n do_insert_tree+0x26b/0x1aa0 fs/quota/quota_tree.c:340\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\n do_insert_tree+0x722/0x1aa0 fs/quota/quota_tree.c:375\n dq_insert_tree fs/quota/quota_tree.c:401 [inline]\n qtree_write_dquot+0x3b6/0x530 fs/quota/quota_tree.c:420\n v2_write_dquot+0x11b/0x190 fs/quota/quota_v2.c:358\n dquot_acquire+0x348/0x670 fs/quota/dquot.c:444\n ext4_acquire_dquot+0x2dc/0x400 fs/ext4/super.c:6740\n dqget+0x999/0xdc0 fs/quota/dquot.c:914\n __dquot_initialize+0x3d0/0xcf0 fs/quota/dquot.c:1492\n ext4_process_orphan+0x57/0x2d0 fs/ext4/orphan.c:329\n ext4_orphan_cleanup+0xb60/0x1340 fs/ext4/orphan.c:474\n __ext4_fill_super fs/ext4/super.c:5516 [inline]\n ext4_fill_super+0x81cd/0x8700 fs/ext4/super.c:5644\n get_tree_bdev+0x400/0x620 fs/super.c:1282\n vfs_get_tree+0x88/0x270 fs/super.c:1489\n do_new_mount+0x289/0xad0 fs/namespace.c:3145\n do_mount fs/namespace.c:3488 [inline]\n __do_sys_mount fs/namespace.c:3697 [inline]\n __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nAdd some debug information:\nmb_find_extent: mb_find_extent block=41, order=0 needed=64 next=0 ex=0/41/1@3735929054 64 64 7\nblock_bitmap: ff 3f 0c 00 fc 01 00 00 d2 3d 00 00 00 00 00 00 ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff\n\nAcctually, blocks per group is 64, but block bitmap indicate at least has\n128 blocks. Now, ext4_validate_block_bitmap() didn't check invalid block's\nbitmap if set.\nTo resolve above issue, add check like fsck \"Padding at end of block bitmap is\nnot set\".", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "775b00ba23f6f916fe2ac60c5ff7fd0fe4f28d0d" }, { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "1b90fbc7590124c57a2e590de7fd07eba26606f1" }, { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "5d356d902e9d5b1aaaaf2326d365340fa8a90c1b" }, { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "d55e76e11592a1d18a179c7fd34ca1b52632beb3" }, { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "dba62fa84a8eac44a53a2862de8a40e5bdfa0ae3" }, { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "e4d503c956a744cb59e509ca5f134cfad423c7a3" }, { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "dd45e536f47a82e0a405f9a4b6c7ceb367171ee9" }, { "version": "abcb2947c91130426539f209f7a473a67a1f6663", "status": "affected", "versionType": "git", "lessThan": "fa08a7b61dff8a4df11ff1e84abfc214b487caf7" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.25", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.25" }, { "version": "4.19.283", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.243", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.180", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.112", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.29", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2.16", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.2.*" }, { "version": "6.3.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.3.*" }, { "version": "6.4", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }