# CVE-2022-48872: linux: In the Linux kernel, the following vulnerability has been resolved:  misc: fastrpc: Fix use-after-free race condition...

CVE-2022-48872 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-48872, released August 21, 2024. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-48872
- Priority: High
- CVSS: 7.0 (high)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 21, 2024

## 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

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.8-1 | [DEBIAN-CVE-2022-48872](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48872.md) | Aug 21, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.1.8-1 | [DEBIAN-CVE-2022-48872](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48872.md) | Aug 21, 2024 |
| Linux | linux Debian 14 | 6.1.8-1 | [DEBIAN-CVE-2022-48872](https://patchblox.com/security/data/fix/linux/debian-cve-2022-48872.md) | Aug 21, 2024 |

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