{ "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-2025-39885", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-39885", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-09-23T06:00:52.584Z", "updatedAt": "2026-05-11T21:38:18.541Z", "importedAt": "2026-10-24T01:57:34.152Z", "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 recursive semaphore deadlock in fiemap call", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nocfs2: fix recursive semaphore deadlock in fiemap call\n\nsyzbot detected a OCFS2 hang due to a recursive semaphore on a\nFS_IOC_FIEMAP of the extent list on a specially crafted mmap file.\n\ncontext_switch kernel/sched/core.c:5357 [inline]\n __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961\n __schedule_loop kernel/sched/core.c:7043 [inline]\n schedule+0x165/0x360 kernel/sched/core.c:7058\n schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115\n rwsem_down_write_slowpath+0x872/0xfe0 kernel/locking/rwsem.c:1185\n __down_write_common kernel/locking/rwsem.c:1317 [inline]\n __down_write kernel/locking/rwsem.c:1326 [inline]\n down_write+0x1ab/0x1f0 kernel/locking/rwsem.c:1591\n ocfs2_page_mkwrite+0x2ff/0xc40 fs/ocfs2/mmap.c:142\n do_page_mkwrite+0x14d/0x310 mm/memory.c:3361\n wp_page_shared mm/memory.c:3762 [inline]\n do_wp_page+0x268d/0x5800 mm/memory.c:3981\n handle_pte_fault mm/memory.c:6068 [inline]\n __handle_mm_fault+0x1033/0x5440 mm/memory.c:6195\n handle_mm_fault+0x40a/0x8e0 mm/memory.c:6364\n do_user_addr_fault+0x764/0x1390 arch/x86/mm/fault.c:1387\n handle_page_fault arch/x86/mm/fault.c:1476 [inline]\n exc_page_fault+0x76/0xf0 arch/x86/mm/fault.c:1532\n asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623\nRIP: 0010:copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline]\nRIP: 0010:raw_copy_to_user arch/x86/include/asm/uaccess_64.h:147 [inline]\nRIP: 0010:_inline_copy_to_user include/linux/uaccess.h:197 [inline]\nRIP: 0010:_copy_to_user+0x85/0xb0 lib/usercopy.c:26\nCode: e8 00 bc f7 fc 4d 39 fc 72 3d 4d 39 ec 77 38 e8 91 b9 f7 fc 4c 89\nf7 89 de e8 47 25 5b fd 0f 01 cb 4c 89 ff 48 89 d9 4c 89 f6 a4 0f\n1f 00 48 89 cb 0f 01 ca 48 89 d8 5b 41 5c 41 5d 41 5e 41\nRSP: 0018:ffffc9000403f950 EFLAGS: 00050256\nRAX: ffffffff84c7f101 RBX: 0000000000000038 RCX: 0000000000000038\nRDX: 0000000000000000 RSI: ffffc9000403f9e0 RDI: 0000200000000060\nRBP: ffffc9000403fa90 R08: ffffc9000403fa17 R09: 1ffff92000807f42\nR10: dffffc0000000000 R11: fffff52000807f43 R12: 0000200000000098\nR13: 00007ffffffff000 R14: ffffc9000403f9e0 R15: 0000200000000060\n copy_to_user include/linux/uaccess.h:225 [inline]\n fiemap_fill_next_extent+0x1c0/0x390 fs/ioctl.c:145\n ocfs2_fiemap+0x888/0xc90 fs/ocfs2/extent_map.c:806\n ioctl_fiemap fs/ioctl.c:220 [inline]\n do_vfs_ioctl+0x1173/0x1430 fs/ioctl.c:532\n __do_sys_ioctl fs/ioctl.c:596 [inline]\n __se_sys_ioctl+0x82/0x170 fs/ioctl.c:584\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\nRIP: 0033:0x7f5f13850fd9\nRSP: 002b:00007ffe3b3518b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010\nRAX: ffffffffffffffda RBX: 0000200000000000 RCX: 00007f5f13850fd9\nRDX: 0000200000000040 RSI: 00000000c020660b RDI: 0000000000000004\nRBP: 6165627472616568 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe3b3518f0\nR13: 00007ffe3b351b18 R14: 431bde82d7b634db R15: 00007f5f1389a03b\n\nocfs2_fiemap() takes a read lock of the ip_alloc_sem semaphore (since\nv2.6.22-527-g7307de80510a) and calls fiemap_fill_next_extent() to read the\nextent list of this running mmap executable. The user supplied buffer to\nhold the fiemap information page faults calling ocfs2_page_mkwrite() which\nwill take a write lock (since v2.6.27-38-g00dc417fa3e7) of the same\nsemaphore. This recursive semaphore will hold filesystem locks and causes\na hang of the fileystem.\n\nThe ip_alloc_sem protects the inode extent list and size. Release the\nread semphore before calling fiemap_fill_next_extent() in ocfs2_fiemap()\nand ocfs2_fiemap_inline(). This does an unnecessary semaphore lock/unlock\non the last extent but simplifies the error path.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "16e518ca84dfe860c20a62f3615e14e8af0ace57" }, { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "7e1514bd44ef68007703c752c99ff7319f35bce6" }, { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "ef30404980e4c832ef9bba1b10c08f67fa77a9ec" }, { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "36054554772f95d090eb45793faf6aa3c0254b02" }, { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "0709bc11b942870fc0a7be150e42aea42321093a" }, { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "1d3c96547ee2ddeaddf8f19a3ef99ea06cc8115e" }, { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "9efcb7a8b97310efed995397941a292cf89fa94f" }, { "version": "00dc417fa3e763345b34ccb6034d72de76eea0a1", "status": "affected", "versionType": "git", "lessThan": "04100f775c2ea501927f508f17ad824ad1f23c8d" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "2.6.28", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "2.6.28" }, { "version": "5.4.300", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.245", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.194", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.153", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.107", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.48", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.16.8", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.16.*" }, { "version": "6.17", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }