CVE-2022-48872
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-48872
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48872.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-48872
- Downstream
- Related
- Published
- 2024-08-21T07:15:04Z
- Modified
- 2025-08-09T20:01:27Z
- Severity
-
- 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
misc: fastrpc: Fix use-after-free race condition for maps
It is possible that in between calling fastrpcmapget() until map->fl->lock is taken in fastrpcfreemap(), another thread can call fastrpcmaplookup() and get a reference to a map that is about to be deleted.
Rewrite fastrpcmapget() to only increase the reference count of a map if it's non-zero. Propagate this to callers so they can know if a map is about to be deleted.
Fixes this warning: refcountt: addition on 0; use-after-free. WARNING: CPU: 5 PID: 10100 at lib/refcount.c:25 refcountwarnsaturate ... Call trace: refcountwarnsaturate [fastrpcmapget inlined] [fastrpcmaplookup inlined] fastrpcmapcreate fastrpcinternalinvoke fastrpcdeviceioctl _arm64sysioctl invoke_syscall
- References
-
- https://git.kernel.org/stable/c/079c78c68714f7d8d58e66c477b0243b31806907
- https://git.kernel.org/stable/c/556dfdb226ce1e5231d8836159b23f8bb0395bf4
- https://git.kernel.org/stable/c/61a0890cb95afec5c8a2f4a879de2b6220984ef1
- https://git.kernel.org/stable/c/96b328d119eca7563c1edcc4e1039a62e6370ecb
- https://git.kernel.org/stable/c/b171d0d2cf1b8387c72c8d325c5d5746fa271e39