CVE-2022-48872
misc: fastrpc: Fix use-after-free race condition for maps
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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 fastrpc_map_get() until map->fl->lock is taken in fastrpc_free_map(), another thread can call fastrpc_map_lookup() and get a reference to a map that is about to be deleted. Rewrite fastrpc_map_get() 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: refcount_t: addition on 0; use-after-free. WARNING: CPU: 5 PID: 10100 at lib/refcount.c:25 refcount_warn_saturate ... Call trace: refcount_warn_saturate [fastrpc_map_get inlined] [fastrpc_map_lookup inlined] fastrpc_map_create fastrpc_internal_invoke fastrpc_device_ioctl __arm64_sys_ioctl invoke_syscall
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High7.0 | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 84% of all CVEs (6 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 – < 556dfdb226ce1e5231d8836159b23f8bb0395bf4
- affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 – < b171d0d2cf1b8387c72c8d325c5d5746fa271e39
- affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 – < 61a0890cb95afec5c8a2f4a879de2b6220984ef1
- affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 – < 079c78c68714f7d8d58e66c477b0243b31806907
- affected c68cfb718c8f97b7f7a50ed66be5feb42d0c8988 – < 96b328d119eca7563c1edcc4e1039a62e6370ecb
- affected 5.1
- unaffected < 5.1
- unaffected 5.4.230 – ≤ 5.4.*
- unaffected 5.10.165 – ≤ 5.10.*
- unaffected 5.15.90 – ≤ 5.15.*
- unaffected 6.1.8 – ≤ 6.1.*
- unaffected 6.2 – ≤ *
References (5)
- https://git.kernel.org/stable/c/556dfdb226ce1e5231d8836159b23f8bb0395bf4 (opens in a new tab)
- https://git.kernel.org/stable/c/b171d0d2cf1b8387c72c8d325c5d5746fa271e39 (opens in a new tab)
- https://git.kernel.org/stable/c/61a0890cb95afec5c8a2f4a879de2b6220984ef1 (opens in a new tab)
- https://git.kernel.org/stable/c/079c78c68714f7d8d58e66c477b0243b31806907 (opens in a new tab)
- https://git.kernel.org/stable/c/96b328d119eca7563c1edcc4e1039a62e6370ecb (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-48872)Record last updated .