{"answers":{"affected":"It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-47145 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2021-47145 is a medium-severity denial of service vulnerability in Linux kernel, published on 25 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-47145 and fix it if it is affected.\n\nWhat it is: CVE-2021-47145 is a medium-severity denial of service vulnerability in Linux kernel, published on 25 Mar 2024. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-47145 in the wild and no public exploit code.\n\nAffected product: Linux kernel. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2021-47145/ (Markdown: https://insights.sbomify.com/CVE-2021-47145/index.md)","id":"CVE-2021-47145","markdown":"https://insights.sbomify.com/CVE-2021-47145/index.md","name":"CVE-2021-47145","record":{"aliases":["DEBIAN-CVE-2021-47145","GHSA-mh64-ppph-hcxx","UBUNTU-CVE-2021-47145"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A local attacker can cause a kernel panic and system crash by mounting a specially crafted Btrfs filesystem, leading to denial of service.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[{"product":"linux_kernel","vendor":"linux"}],"cvss":{"score":5.5,"severity":"medium","source":"nvd","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"btrfs: do not BUG_ON in link_to_fixup_dir","id":"CVE-2021-47145","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":"linux:linux_kernel","products":["linux:linux_kernel"],"type":"denial_of_service","year":"2021"},"n_packages":0,"n_references":8,"next":{"headline":"mld: fix panic in mld_newpack()","id":"CVE-2021-47146"},"packages":[],"prev":{"headline":"This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.","id":"CVE-2021-47144"},"products":["Linux"],"published":"2024-03-25","related":[{"cvss_score":8.8,"headline":"Linux Kernel Out-of-Bounds Write","id":"CVE-2026-53266","kev_date_added":"2026-09-18","published":"2026-06-25"},{"cvss_score":8.8,"headline":"Linux Kernel Improper Input Validation","id":"CVE-2013-6282","kev_date_added":"2022-09-15","published":"2013-11-19"},{"cvss_score":8.4,"headline":"Linux Kernel Heap-Based Buffer Overflow","id":"CVE-2022-0185","kev_date_added":"2024-08-21","published":"2022-02-11"},{"cvss_score":8.4,"headline":"Linux Kernel Privilege Escalation","id":"CVE-2013-2094","kev_date_added":"2022-09-15","published":"2013-05-14"},{"cvss_score":7.8,"headline":"Linux Kernel Unspecified","id":"CVE-2026-53362","kev_date_added":"2026-08-27","published":"2026-07-04"},{"cvss_score":7.8,"headline":"Linux Kernel Missing Initialization of a Variable","id":"CVE-2026-46300","kev_date_added":"2026-10-28","published":"2026-05-23"},{"cvss_score":7.8,"headline":"Linux Kernel Race Condition","id":"CVE-2025-39964","kev_date_added":"2026-09-18","published":"2025-10-13"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-05-11","vendors":["Linux"]},"summary":"A local attacker can cause a kernel panic and system crash by mounting a specially crafted Btrfs filesystem, leading to denial of service.","url":"https://insights.sbomify.com/CVE-2021-47145/"}