CVE-2025-22070
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-22070
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-22070.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-22070
- Downstream
- Related
- Published
- 2025-04-16T14:12:23Z
- Modified
- 2025-10-10T09:03:52.776401Z
- Severity
-
- 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- fs/9p: fix NULL pointer dereference on mkdir
- Details
-
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 v9fsfidadd() call in function v9fsvfsmkdirdotl() sets the passed 'fid' pointer to NULL (since dafbe689736) even though the subsequent v9fssetcreateacl() 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] ? pagefaultoops (arch/x86/mm/fault.c:714) [ 37.325532] ? searchmoduleextables (kernel/module/main.c:3733) [ 37.326742] ? p9clientwalk (net/9p/client.c:1165) 9pnet [ 37.328006] ? searchbpfextables (kernel/bpf/core.c:804) [ 37.329142] ? excpagefault (./arch/x86/include/asm/paravirt.h:686 arch/x86/mm/fault.c:1488 arch/x86/mm/fault.c:1538) [ 37.330196] ? asmexcpagefault (./arch/x86/include/asm/idtentry.h:574) [ 37.331330] ? p9clientwalk (net/9p/client.c:1165) 9pnet [ 37.332562] ? v9fsfidxattrget (fs/9p/xattr.c:30) 9p [ 37.333824] v9fsfidxattrset (fs/9p/fid.h:23 fs/9p/xattr.c:121) 9p [ 37.335077] v9fssetacl (fs/9p/acl.c:276) 9p [ 37.336112] v9fssetcreateacl (fs/9p/acl.c:307) 9p [ 37.337326] v9fsvfsmkdirdotl (fs/9p/vfsinodedotl.c:411) 9p [ 37.338590] vfsmkdir (fs/namei.c:4313) [ 37.339535] domkdirat (fs/namei.c:4336) [ 37.340465] _x64sysmkdir (fs/namei.c:4354) [ 37.341455] dosyscall64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) [ 37.342447] entrySYSCALL64afterhwframe (arch/x86/entry/entry64.S:130)
Fix this by simply swapping the sequence of these two calls in v9fsvfsmkdirdotl(), i.e. calling v9fssetcreateacl() before v9fsfidadd().
- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/2139dea5c53e3bb63ac49a6901c85e525a80ee8a
- https://git.kernel.org/stable/c/3f61ac7c65bdb26accb52f9db66313597e759821
- https://git.kernel.org/stable/c/6517b395cb1e43fbf3962dd93e6fb4a5e5ab100e
- https://git.kernel.org/stable/c/8522051c58d68146b93e8a5ba9987e83b3d64e7b
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceddafbe689736f62c696ac64809b17bdc752cfbe76Fixed8522051c58d68146b93e8a5ba9987e83b3d64e7b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceddafbe689736f62c696ac64809b17bdc752cfbe76Fixed2139dea5c53e3bb63ac49a6901c85e525a80ee8a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceddafbe689736f62c696ac64809b17bdc752cfbe76Fixed6517b395cb1e43fbf3962dd93e6fb4a5e5ab100e
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduceddafbe689736f62c696ac64809b17bdc752cfbe76Fixed3f61ac7c65bdb26accb52f9db66313597e759821