CVE-2025-22070 (GCVE-0-2025-22070)

Vulnerability from cvelistv5 – Published: 2025-04-16 14:12 – Updated: 2025-10-01 16:16
VLAI?
Title
fs/9p: fix NULL pointer dereference on mkdir
Summary
In the Linux kernel, the following vulnerability has been resolved: fs/9p: fix NULL pointer dereference on mkdir When a 9p tree was mounted with option 'posixacl', parent directory had a default ACL set for its subdirectories, e.g.: setfacl -m default:group:simpsons:rwx parentdir then creating a subdirectory crashed 9p client, as v9fs_fid_add() call in function v9fs_vfs_mkdir_dotl() sets the passed 'fid' pointer to NULL (since dafbe689736) even though the subsequent v9fs_set_create_acl() call expects a valid non-NULL 'fid' pointer: [ 37.273191] BUG: kernel NULL pointer dereference, address: 0000000000000000 ... [ 37.322338] Call Trace: [ 37.323043] <TASK> [ 37.323621] ? __die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434) [ 37.324448] ? page_fault_oops (arch/x86/mm/fault.c:714) [ 37.325532] ? search_module_extables (kernel/module/main.c:3733) [ 37.326742] ? p9_client_walk (net/9p/client.c:1165) 9pnet [ 37.328006] ? search_bpf_extables (kernel/bpf/core.c:804) [ 37.329142] ? exc_page_fault (./arch/x86/include/asm/paravirt.h:686 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538) [ 37.330196] ? asm_exc_page_fault (./arch/x86/include/asm/idtentry.h:574) [ 37.331330] ? p9_client_walk (net/9p/client.c:1165) 9pnet [ 37.332562] ? v9fs_fid_xattr_get (fs/9p/xattr.c:30) 9p [ 37.333824] v9fs_fid_xattr_set (fs/9p/fid.h:23 fs/9p/xattr.c:121) 9p [ 37.335077] v9fs_set_acl (fs/9p/acl.c:276) 9p [ 37.336112] v9fs_set_create_acl (fs/9p/acl.c:307) 9p [ 37.337326] v9fs_vfs_mkdir_dotl (fs/9p/vfs_inode_dotl.c:411) 9p [ 37.338590] vfs_mkdir (fs/namei.c:4313) [ 37.339535] do_mkdirat (fs/namei.c:4336) [ 37.340465] __x64_sys_mkdir (fs/namei.c:4354) [ 37.341455] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 37.342447] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) Fix this by simply swapping the sequence of these two calls in v9fs_vfs_mkdir_dotl(), i.e. calling v9fs_set_create_acl() before v9fs_fid_add().
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dafbe689736f62c696ac64809b17bdc752cfbe76 , < 8522051c58d68146b93e8a5ba9987e83b3d64e7b (git)
Affected: dafbe689736f62c696ac64809b17bdc752cfbe76 , < 2139dea5c53e3bb63ac49a6901c85e525a80ee8a (git)
Affected: dafbe689736f62c696ac64809b17bdc752cfbe76 , < 6517b395cb1e43fbf3962dd93e6fb4a5e5ab100e (git)
Affected: dafbe689736f62c696ac64809b17bdc752cfbe76 , < 3f61ac7c65bdb26accb52f9db66313597e759821 (git)
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    Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.12.23 , ≤ 6.12.* (semver)
Unaffected: 6.13.11 , ≤ 6.13.* (semver)
Unaffected: 6.14.2 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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          "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 \u0027posixacl\u0027, 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 \u0027fid\u0027 pointer to NULL\n(since dafbe689736) even though the subsequent v9fs_set_create_acl() call\nexpects a valid non-NULL \u0027fid\u0027 pointer:\n\n  [   37.273191] BUG: kernel NULL pointer dereference, address: 0000000000000000\n  ...\n  [   37.322338] Call Trace:\n  [   37.323043]  \u003cTASK\u003e\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()."
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__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().\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.23\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.13.11\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.14.2\", \"versionStartIncluding\": \"6.0\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.15\", \"versionStartIncluding\": \"6.0\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-26T05:17:48.958Z\"}}}",
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