{ "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-2023-53143", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53143", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-05-02T15:56:13.656Z", "updatedAt": "2026-05-11T19:39:16.726Z", "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 another off-by-one fsmap error on 1k block filesystems", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix another off-by-one fsmap error on 1k block filesystems\n\nApparently syzbot figured out that issuing this FSMAP call:\n\nstruct fsmap_head cmd = {\n\t.fmh_count\t= ...;\n\t.fmh_keys\t= {\n\t\t{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },\n\t\t{ .fmr_device = /* ext4 dev */, .fmr_physical = 0, },\n\t},\n...\n};\nret = ioctl(fd, FS_IOC_GETFSMAP, &cmd);\n\nProduces this crash if the underlying filesystem is a 1k-block ext4\nfilesystem:\n\nkernel BUG at fs/ext4/ext4.h:3331!\ninvalid opcode: 0000 [#1] PREEMPT SMP\nCPU: 3 PID: 3227965 Comm: xfs_io Tainted: G W O 6.2.0-rc8-achx\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014\nRIP: 0010:ext4_mb_load_buddy_gfp+0x47c/0x570 [ext4]\nRSP: 0018:ffffc90007c03998 EFLAGS: 00010246\nRAX: ffff888004978000 RBX: ffffc90007c03a20 RCX: ffff888041618000\nRDX: 0000000000000000 RSI: 00000000000005a4 RDI: ffffffffa0c99b11\nRBP: ffff888012330000 R08: ffffffffa0c2b7d0 R09: 0000000000000400\nR10: ffffc90007c03950 R11: 0000000000000000 R12: 0000000000000001\nR13: 00000000ffffffff R14: 0000000000000c40 R15: ffff88802678c398\nFS: 00007fdf2020c880(0000) GS:ffff88807e100000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007ffd318a5fe8 CR3: 000000007f80f001 CR4: 00000000001706e0\nCall Trace:\n \n ext4_mballoc_query_range+0x4b/0x210 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n ext4_getfsmap_datadev+0x713/0x890 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n ext4_getfsmap+0x2b7/0x330 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n ext4_ioc_getfsmap+0x153/0x2b0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n __ext4_ioctl+0x2a7/0x17e0 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80]\n __x64_sys_ioctl+0x82/0xa0\n do_syscall_64+0x2b/0x80\n entry_SYSCALL_64_after_hwframe+0x46/0xb0\nRIP: 0033:0x7fdf20558aff\nRSP: 002b:00007ffd318a9e30 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 00000000000200c0 RCX: 00007fdf20558aff\nRDX: 00007fdf1feb2010 RSI: 00000000c0c0583b RDI: 0000000000000003\nRBP: 00005625c0634be0 R08: 00005625c0634c40 R09: 0000000000000001\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007fdf1feb2010\nR13: 00005625be70d994 R14: 0000000000000800 R15: 0000000000000000\n\nFor GETFSMAP calls, the caller selects a physical block device by\nwriting its block number into fsmap_head.fmh_keys[01].fmr_device.\nTo query mappings for a subrange of the device, the starting byte of the\nrange is written to fsmap_head.fmh_keys[0].fmr_physical and the last\nbyte of the range goes in fsmap_head.fmh_keys[1].fmr_physical.\n\nIOWs, to query what mappings overlap with bytes 3-14 of /dev/sda, you'd\nset the inputs as follows:\n\n\tfmh_keys[0] = { .fmr_device = major(8, 0), .fmr_physical = 3},\n\tfmh_keys[1] = { .fmr_device = major(8, 0), .fmr_physical = 14},\n\nWhich would return you whatever is mapped in the 12 bytes starting at\nphysical offset 3.\n\nThe crash is due to insufficient range validation of keys[1] in\next4_getfsmap_datadev. On 1k-block filesystems, block 0 is not part of\nthe filesystem, which means that s_first_data_block is nonzero.\next4_get_group_no_and_offset subtracts this quantity from the blocknr\nargument before cracking it into a group number and a block number\nwithin a group. IOWs, block group 0 spans blocks 1-8192 (1-based)\ninstead of 0-8191 (0-based) like what happens with larger blocksizes.\n\nThe net result of this encoding is that blocknr < s_first_data_block is\nnot a valid input to this function. The end_fsb variable is set from\nthe keys that are copied from userspace, which means that in the above\nexample, its value is zero. That leads to an underflow here:\n\n\tblocknr = blocknr - le32_to_cpu(es->s_first_data_block);\n\nThe division then operates on -1:\n\n\toffset = do_div(blocknr, EXT4_BLOCKS_PER_GROUP(sb)) >>\n\t\tEXT4_SB(sb)->s_cluster_bits;\n\nLeaving an impossibly large group number (2^32-1) in blocknr.\next4_getfsmap_check_keys checked that keys[0\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "a70b49dc7eee5dbe3775a650ce598e3557ff5475" }, { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "f16054ac1774915160ca4e1c73ff7a269465a1b9" }, { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "c24f838493792b5e78a3596b4ca96375aa0af4c2" }, { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "1d2366624b4c19a2ba6baf67fe57f4a1b0f67c05" }, { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "c5d7c31e17224d847a330180ec1b03bf390632b2" }, { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "eb3a695aa71a514f2e7f5778e05faba3733b70a0" }, { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "15ebade3266b300da9cd1edce4004fe8fd6a2b88" }, { "version": "4a4956249dac0b9b0027949907bff0cd1a9b57fa", "status": "affected", "versionType": "git", "lessThan": "c993799baf9c5861f8df91beb80e1611b12efcbd" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "4.13", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "4.13" }, { "version": "4.14.310", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.278", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.237", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.175", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.103", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.20", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2.7", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.2.*" }, { "version": "6.3", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }