{"id":"CVE-2025-22070","state":"PUBLISHED","title":"fs/9p: fix NULL pointer dereference on mkdir","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/9p: fix NULL pointer dereference on mkdir\n\nWhen a 9p tree was mounted with option 'posixacl', parent directory had a\ndefault ACL set for its subdirectories, e.g.:\n\n  setfacl -m default:group:simpsons:rwx parentdir\n\nthen creating a subdirectory crashed 9p client, as v9fs_fid_add() call in\nfunction v9fs_vfs_mkdir_dotl() sets the passed 'fid' pointer to NULL\n(since dafbe689736) even though the subsequent v9fs_set_create_acl() call\nexpects a valid non-NULL 'fid' pointer:\n\n  [   37.273191] BUG: kernel NULL pointer dereference, address: 0000000000000000\n  ...\n  [   37.322338] Call Trace:\n  [   37.323043]  <TASK>\n  [   37.323621] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)\n  [   37.324448] ? page_fault_oops (arch/x86/mm/fault.c:714)\n  [   37.325532] ? search_module_extables (kernel/module/main.c:3733)\n  [   37.326742] ? p9_client_walk (net/9p/client.c:1165) 9pnet\n  [   37.328006] ? search_bpf_extables (kernel/bpf/core.c:804)\n  [   37.329142] ? exc_page_fault (./arch/x86/include/asm/paravirt.h:686 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538)\n  [   37.330196] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:574)\n  [   37.331330] ? p9_client_walk (net/9p/client.c:1165) 9pnet\n  [   37.332562] ? v9fs_fid_xattr_get (fs/9p/xattr.c:30) 9p\n  [   37.333824] v9fs_fid_xattr_set (fs/9p/fid.h:23 fs/9p/xattr.c:121) 9p\n  [   37.335077] v9fs_set_acl (fs/9p/acl.c:276) 9p\n  [   37.336112] v9fs_set_create_acl (fs/9p/acl.c:307) 9p\n  [   37.337326] v9fs_vfs_mkdir_dotl (fs/9p/vfs_inode_dotl.c:411) 9p\n  [   37.338590] vfs_mkdir (fs/namei.c:4313)\n  [   37.339535] do_mkdirat (fs/namei.c:4336)\n  [   37.340465] __x64_sys_mkdir (fs/namei.c:4354)\n  [   37.341455] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\n  [   37.342447] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFix this by simply swapping the sequence of these two calls in\nv9fs_vfs_mkdir_dotl(), i.e. calling v9fs_set_create_acl() before\nv9fs_fid_add().","publishedAt":"2025-04-16T14:12:23.295Z","updatedAt":"2026-10-30T12:21:12.512Z","severity":{"score":5.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"CISA-ADP"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"d5031a71a2d0e76d3eb02b52b21c17c881919d53","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"b17edabd917142d9ecd058f7c6ee9da5e32af1dd","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"8522051c58d68146b93e8a5ba9987e83b3d64e7b","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"2139dea5c53e3bb63ac49a6901c85e525a80ee8a","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"6517b395cb1e43fbf3962dd93e6fb4a5e5ab100e","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"3f61ac7c65bdb26accb52f9db66313597e759821","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/9p/vfs_inode_dotl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.23","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.11","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14.2","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/9p/vfs_inode_dotl.c"]}],"references":["https://git.kernel.org/stable/c/d5031a71a2d0e76d3eb02b52b21c17c881919d53","https://git.kernel.org/stable/c/b17edabd917142d9ecd058f7c6ee9da5e32af1dd","https://git.kernel.org/stable/c/8522051c58d68146b93e8a5ba9987e83b3d64e7b","https://git.kernel.org/stable/c/2139dea5c53e3bb63ac49a6901c85e525a80ee8a","https://git.kernel.org/stable/c/6517b395cb1e43fbf3962dd93e6fb4a5e5ab100e","https://git.kernel.org/stable/c/3f61ac7c65bdb26accb52f9db66313597e759821"],"weaknesses":["CWE-476"],"ingestedAt":"2026-10-30T12:38:04.623Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2025/22xxx/CVE-2025-22070.json","commit":"db8103c5921aac81d5d90efcf3745980dafabf49","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2025-22070","state":"PUBLISHED","datePublished":"2025-04-16T14:12:23.295Z","dateUpdated":"2026-10-30T12:21:12.512Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-12-29T08:45:45.814Z"},"containers":{"cna":{"title":"fs/9p: fix NULL pointer dereference on mkdir","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs/9p: fix NULL pointer dereference on mkdir\n\nWhen a 9p tree was mounted with option 'posixacl', parent directory had a\ndefault ACL set for its subdirectories, e.g.:\n\n  setfacl -m default:group:simpsons:rwx parentdir\n\nthen creating a subdirectory crashed 9p client, as v9fs_fid_add() call in\nfunction v9fs_vfs_mkdir_dotl() sets the passed 'fid' pointer to NULL\n(since dafbe689736) even though the subsequent v9fs_set_create_acl() call\nexpects a valid non-NULL 'fid' pointer:\n\n  [   37.273191] BUG: kernel NULL pointer dereference, address: 0000000000000000\n  ...\n  [   37.322338] Call Trace:\n  [   37.323043]  <TASK>\n  [   37.323621] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434)\n  [   37.324448] ? page_fault_oops (arch/x86/mm/fault.c:714)\n  [   37.325532] ? search_module_extables (kernel/module/main.c:3733)\n  [   37.326742] ? p9_client_walk (net/9p/client.c:1165) 9pnet\n  [   37.328006] ? search_bpf_extables (kernel/bpf/core.c:804)\n  [   37.329142] ? exc_page_fault (./arch/x86/include/asm/paravirt.h:686 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538)\n  [   37.330196] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:574)\n  [   37.331330] ? p9_client_walk (net/9p/client.c:1165) 9pnet\n  [   37.332562] ? v9fs_fid_xattr_get (fs/9p/xattr.c:30) 9p\n  [   37.333824] v9fs_fid_xattr_set (fs/9p/fid.h:23 fs/9p/xattr.c:121) 9p\n  [   37.335077] v9fs_set_acl (fs/9p/acl.c:276) 9p\n  [   37.336112] v9fs_set_create_acl (fs/9p/acl.c:307) 9p\n  [   37.337326] v9fs_vfs_mkdir_dotl (fs/9p/vfs_inode_dotl.c:411) 9p\n  [   37.338590] vfs_mkdir (fs/namei.c:4313)\n  [   37.339535] do_mkdirat (fs/namei.c:4336)\n  [   37.340465] __x64_sys_mkdir (fs/namei.c:4354)\n  [   37.341455] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)\n  [   37.342447] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)\n\nFix this by simply swapping the sequence of these two calls in\nv9fs_vfs_mkdir_dotl(), i.e. calling v9fs_set_create_acl() before\nv9fs_fid_add()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"d5031a71a2d0e76d3eb02b52b21c17c881919d53","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"b17edabd917142d9ecd058f7c6ee9da5e32af1dd","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"8522051c58d68146b93e8a5ba9987e83b3d64e7b","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"2139dea5c53e3bb63ac49a6901c85e525a80ee8a","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"6517b395cb1e43fbf3962dd93e6fb4a5e5ab100e","versionType":"git"},{"version":"dafbe689736f62c696ac64809b17bdc752cfbe76","status":"affected","lessThan":"3f61ac7c65bdb26accb52f9db66313597e759821","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/9p/vfs_inode_dotl.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.0","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.23","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.13.11","status":"unaffected","lessThanOrEqual":"6.13.*","versionType":"semver"},{"version":"6.14.2","status":"unaffected","lessThanOrEqual":"6.14.*","versionType":"semver"},{"version":"6.15","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["fs/9p/vfs_inode_dotl.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/d5031a71a2d0e76d3eb02b52b21c17c881919d53"},{"url":"https://git.kernel.org/stable/c/b17edabd917142d9ecd058f7c6ee9da5e32af1dd"},{"url":"https://git.kernel.org/stable/c/8522051c58d68146b93e8a5ba9987e83b3d64e7b"},{"url":"https://git.kernel.org/stable/c/2139dea5c53e3bb63ac49a6901c85e525a80ee8a"},{"url":"https://git.kernel.org/stable/c/6517b395cb1e43fbf3962dd93e6fb4a5e5ab100e"},{"url":"https://git.kernel.org/stable/c/3f61ac7c65bdb26accb52f9db66313597e759821"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:21:12.512Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.12.23"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.13.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.14.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.0","versionEndExcluding":"6.15"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.5,"attackVector":"LOCAL","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"LOW","confidentialityImpact":"NONE"}},{"other":{"type":"ssvc","content":{"timestamp":"2025-10-01T16:15:56.459715Z","id":"CVE-2025-22070","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-476","type":"CWE","lang":"en","description":"CWE-476 NULL Pointer Dereference"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-10-01T16:16:00.918Z"}}]}}}