# CVE-2022-49393: linux: In the Linux kernel, the following vulnerability has been resolved:  misc: fastrpc: fix list iterator in fastrpc_req_...

CVE-2022-49393 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49393, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49393
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  misc: fastrpc: fix list iterator in fastrpc_req_mem_unmap_impl  This is another instance of incorrect use of list iterator and checking it for NULL.  The list iterator value 'map' will *always* be set and non-NULL by list_for_each_entry(), so it is incorrect to assume that the iterator value will be NULL if the list is empty (in this case, the check 'if (!map) {' will always be false and never exit as expected).  To fix the bug, use a new variable 'iter' as the list iterator, while use the original variable 'map' as a dedicated pointer to point to the found element.  Without this patch, Kernel crashes with below trace:  Unable to handle kernel access to user memory outside uaccess routines  at virtual address 0000ffff7fb03750 ... Call trace:  fastrpc_map_create+0x70/0x290 [fastrpc]  fastrpc_req_mem_map+0xf0/0x2dc [fastrpc]  fastrpc_device_ioctl+0x138/0xc60 [fastrpc]  __arm64_sys_ioctl+0xa8/0xec  invoke_syscall+0x48/0x114  el0_svc_common.constprop.0+0xd4/0xfc  do_el0_svc+0x28/0x90  el0_svc+0x3c/0x130  el0t_64_sync_handler+0xa4/0x130  el0t_64_sync+0x18c/0x190 Code: 14000016 f94000a5 eb05029f 54000260 (b94018a6) ---[ end trace 0000000000000000 ]---

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.5-1 | [DEBIAN-CVE-2022-49393](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49393.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.5-1 | [DEBIAN-CVE-2022-49393](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49393.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.5-1 | [DEBIAN-CVE-2022-49393](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49393.md) | Feb 26, 2025 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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