# CVE-2022-49696: linux: In the Linux kernel, the following vulnerability has been resolved:  tipc: fix use-after-free Read in tipc_named_rein...

CVE-2022-49696 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49696, released February 26, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-49696
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0029
- 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:  tipc: fix use-after-free Read in tipc_named_reinit  syzbot found the following issue on: ================================================================== BUG: KASAN: use-after-free in tipc_named_reinit+0x94f/0x9b0 net/tipc/name_distr.c:413 Read of size 8 at addr ffff88805299a000 by task kworker/1:9/23764  CPU: 1 PID: 23764 Comm: kworker/1:9 Not tainted 5.18.0-rc4-syzkaller-00878-g17d49e6e8012 #0 Hardware name: Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events tipc_net_finalize_work Call Trace:  <TASK>  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106  print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313  print_report mm/kasan/report.c:429 [inline]  kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491  tipc_named_reinit+0x94f/0x9b0 net/tipc/name_distr.c:413  tipc_net_finalize+0x234/0x3d0 net/tipc/net.c:138  process_one_work+0x996/0x1610 kernel/workqueue.c:2289  worker_thread+0x665/0x1080 kernel/workqueue.c:2436  kthread+0x2e9/0x3a0 kernel/kthread.c:376  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298  </TASK> [...] ==================================================================  In the commit d966ddcc3821 ("tipc: fix a deadlock when flushing scheduled work"), the cancel_work_sync() function just to make sure ONLY the work tipc_net_finalize_work() is executing/pending on any CPU completed before tipc namespace is destroyed through tipc_exit_net(). But this function is not guaranteed the work is the last queued. So, the destroyed instance may be accessed in the work which will try to enqueue later.  In order to completely fix, we re-order the calling of cancel_work_sync() to make sure the work tipc_net_finalize_work() was last queued and it must be completed by calling cancel_work_sync().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.18.14-1 | [DEBIAN-CVE-2022-49696](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49696.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.18.14-1 | [DEBIAN-CVE-2022-49696](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49696.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.18.14-1 | [DEBIAN-CVE-2022-49696](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49696.md) | Feb 26, 2025 |

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Data as of 2026-11-08T06:59:42Z 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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