{"cve":"CVE-2021-47145","nvd":{"published":"2024-03-25T09:15:08.993","modified":"2026-06-17T04:16:38.917","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: do not BUG_ON in link_to_fixup_dir\n\nWhile doing error injection testing I got the following panic\n\n  kernel BUG at fs/btrfs/tree-log.c:1862!\n  invalid opcode: 0000 [#1] SMP NOPTI\n  CPU: 1 PID: 7836 Comm: mount Not tainted 5.13.0-rc1+ #305\n  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.13.0-2.fc32 04/01/2014\n  RIP: 0010:link_to_fixup_dir+0xd5/0xe0\n  RSP: 0018:ffffb5800180fa30 EFLAGS: 00010216\n  RAX: fffffffffffffffb RBX: 00000000fffffffb RCX: ffff8f595287faf0\n  RDX: ffffb5800180fa37 RSI: ffff8f5954978800 RDI: 0000000000000000\n  RBP: ffff8f5953af9450 R08: 0000000000000019 R09: 0000000000000001\n  R10: 000151f408682970 R11: 0000000120021001 R12: ffff8f5954978800\n  R13: ffff8f595287faf0 R14: ffff8f5953c77dd0 R15: 0000000000000065\n  FS:  00007fc5284c8c40(0000) GS:ffff8f59bbd00000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 00007fc5287f47c0 CR3: 000000011275e002 CR4: 0000000000370ee0\n  Call Trace:\n   replay_one_buffer+0x409/0x470\n   ? btree_read_extent_buffer_pages+0xd0/0x110\n   walk_up_log_tree+0x157/0x1e0\n   walk_log_tree+0xa6/0x1d0\n   btrfs_recover_log_trees+0x1da/0x360\n   ? replay_one_extent+0x7b0/0x7b0\n   open_ctree+0x1486/0x1720\n   btrfs_mount_root.cold+0x12/0xea\n   ? __kmalloc_track_caller+0x12f/0x240\n   legacy_get_tree+0x24/0x40\n   vfs_get_tree+0x22/0xb0\n   vfs_kern_mount.part.0+0x71/0xb0\n   btrfs_mount+0x10d/0x380\n   ? vfs_parse_fs_string+0x4d/0x90\n   legacy_get_tree+0x24/0x40\n   vfs_get_tree+0x22/0xb0\n   path_mount+0x433/0xa10\n   __x64_sys_mount+0xe3/0x120\n   do_syscall_64+0x3d/0x80\n   entry_SYSCALL_64_after_hwframe+0x44/0xae\n\nWe can get -EIO or any number of legitimate errors from\nbtrfs_search_slot(), panicing here is not the appropriate response.  The\nerror path for this code handles errors properly, simply return the\nerror.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":[],"references":["https://git.kernel.org/stable/c/0eaf383c6a4a83c09f60fd07a1bea9f1a9181611","https://git.kernel.org/stable/c/0ed102453aa1cd12fefde8f6b60b9519b0b1f003","https://git.kernel.org/stable/c/6eccfb28f8dca70c9b1b3bb3194ca54cbe73a9fa","https://git.kernel.org/stable/c/76bfd8ac20bebeae599452a03dfc5724c0475dcf","https://git.kernel.org/stable/c/7e13db503918820e6333811cdc6f151dcea5090a"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T21:47:51.568503435+00:00"},"epss":{"cve":"CVE-2021-47145","score":0.00269,"percentile":0.19131,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}