{ "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-2025-21754", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21754", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-02-27T02:12:23.738Z", "updatedAt": "2026-05-11T21:05:47.261Z", "importedAt": "2026-10-24T01:57:29.455Z", "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": "btrfs: fix assertion failure when splitting ordered extent after transaction abort", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix assertion failure when splitting ordered extent after transaction abort\n\nIf while we are doing a direct IO write a transaction abort happens, we\nmark all existing ordered extents with the BTRFS_ORDERED_IOERR flag (done\nat btrfs_destroy_ordered_extents()), and then after that if we enter\nbtrfs_split_ordered_extent() and the ordered extent has bytes left\n(meaning we have a bio that doesn't cover the whole ordered extent, see\ndetails at btrfs_extract_ordered_extent()), we will fail on the following\nassertion at btrfs_split_ordered_extent():\n\n ASSERT(!(flags & ~BTRFS_ORDERED_TYPE_FLAGS));\n\nbecause the BTRFS_ORDERED_IOERR flag is set and the definition of\nBTRFS_ORDERED_TYPE_FLAGS is just the union of all flags that identify the\ntype of write (regular, nocow, prealloc, compressed, direct IO, encoded).\n\nFix this by returning an error from btrfs_extract_ordered_extent() if we\nfind the BTRFS_ORDERED_IOERR flag in the ordered extent. The error will\nbe the error that resulted in the transaction abort or -EIO if no\ntransaction abort happened.\n\nThis was recently reported by syzbot with the following trace:\n\n FAULT_INJECTION: forcing a failure.\n name failslab, interval 1, probability 0, space 0, times 1\n CPU: 0 UID: 0 PID: 5321 Comm: syz.0.0 Not tainted 6.13.0-rc5-syzkaller #0\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014\n Call Trace:\n \n __dump_stack lib/dump_stack.c:94 [inline]\n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120\n fail_dump lib/fault-inject.c:53 [inline]\n should_fail_ex+0x3b0/0x4e0 lib/fault-inject.c:154\n should_failslab+0xac/0x100 mm/failslab.c:46\n slab_pre_alloc_hook mm/slub.c:4072 [inline]\n slab_alloc_node mm/slub.c:4148 [inline]\n __do_kmalloc_node mm/slub.c:4297 [inline]\n __kmalloc_noprof+0xdd/0x4c0 mm/slub.c:4310\n kmalloc_noprof include/linux/slab.h:905 [inline]\n kzalloc_noprof include/linux/slab.h:1037 [inline]\n btrfs_chunk_alloc_add_chunk_item+0x244/0x1100 fs/btrfs/volumes.c:5742\n reserve_chunk_space+0x1ca/0x2c0 fs/btrfs/block-group.c:4292\n check_system_chunk fs/btrfs/block-group.c:4319 [inline]\n do_chunk_alloc fs/btrfs/block-group.c:3891 [inline]\n btrfs_chunk_alloc+0x77b/0xf80 fs/btrfs/block-group.c:4187\n find_free_extent_update_loop fs/btrfs/extent-tree.c:4166 [inline]\n find_free_extent+0x42d1/0x5810 fs/btrfs/extent-tree.c:4579\n btrfs_reserve_extent+0x422/0x810 fs/btrfs/extent-tree.c:4672\n btrfs_new_extent_direct fs/btrfs/direct-io.c:186 [inline]\n btrfs_get_blocks_direct_write+0x706/0xfa0 fs/btrfs/direct-io.c:321\n btrfs_dio_iomap_begin+0xbb7/0x1180 fs/btrfs/direct-io.c:525\n iomap_iter+0x697/0xf60 fs/iomap/iter.c:90\n __iomap_dio_rw+0xeb9/0x25b0 fs/iomap/direct-io.c:702\n btrfs_dio_write fs/btrfs/direct-io.c:775 [inline]\n btrfs_direct_write+0x610/0xa30 fs/btrfs/direct-io.c:880\n btrfs_do_write_iter+0x2a0/0x760 fs/btrfs/file.c:1397\n do_iter_readv_writev+0x600/0x880\n vfs_writev+0x376/0xba0 fs/read_write.c:1050\n do_pwritev fs/read_write.c:1146 [inline]\n __do_sys_pwritev2 fs/read_write.c:1204 [inline]\n __se_sys_pwritev2+0x196/0x2b0 fs/read_write.c:1195\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n RIP: 0033:0x7f1281f85d29\n RSP: 002b:00007f12819fe038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148\n RAX: ffffffffffffffda RBX: 00007f1282176080 RCX: 00007f1281f85d29\n RDX: 0000000000000001 RSI: 0000000020000240 RDI: 0000000000000005\n RBP: 00007f12819fe090 R08: 0000000000000000 R09: 0000000000000003\n R10: 0000000000007000 R11: 0000000000000246 R12: 0000000000000002\n R13: 0000000000000000 R14: 00007f1282176080 R15: 00007ffcb9e23328\n \n BTRFS error (device loop0 state A): Transaction aborted (error -12)\n BTRFS: error (device loop0 state A\n---truncated---", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a", "status": "affected", "versionType": "git", "lessThan": "927b930f117bbae730a853c1dc43da8afe8380fa" }, { "version": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a", "status": "affected", "versionType": "git", "lessThan": "0ff88c2a742a7cbaa4d08507d864737d099b435a" }, { "version": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a", "status": "affected", "versionType": "git", "lessThan": "8ea8db4216d1029527ab4666f730650419451e32" }, { "version": "52b1fdca23ac0fbcad363a1a5b426bf0d56b715a", "status": "affected", "versionType": "git", "lessThan": "0d85f5c2dd91df6b5da454406756f463ba923b69" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.5", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.5" }, { "version": "6.6.78", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.14", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.13.3", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.13.*" }, { "version": "6.14", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }