# CVE-2022-50697: linux: In the Linux kernel, the following vulnerability has been resolved:  mrp: introduce active flags to prevent UAF when...

CVE-2022-50697 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-50697, released December 24, 2025. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-50697
- Priority: High
- CVSS: 7.8 (high)
- EPSS: 0.0016
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 24, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  mrp: introduce active flags to prevent UAF when applicant uninit  The caller of del_timer_sync must prevent restarting of the timer, If we have no this synchronization, there is a small probability that the cancellation will not be successful.  And syzbot report the fellowing crash: ================================================================== BUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline] BUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605 Write at addr f9ff000024df6058 by task syz-fuzzer/2256 Pointer tag: [f9], memory tag: [fe]  CPU: 1 PID: 2256 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008- ge01d50cbd6ee #0 Hardware name: linux,dummy-virt (DT) Call trace:  dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156  dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline]  show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163  __dump_stack lib/dump_stack.c:88 [inline]  dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106  print_address_description mm/kasan/report.c:284 [inline]  print_report+0x1a8/0x4a0 mm/kasan/report.c:395  kasan_report+0x94/0xb4 mm/kasan/report.c:495  __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320  do_bad_area arch/arm64/mm/fault.c:473 [inline]  do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749  do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825  el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367  el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427  el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576  hlist_add_head include/linux/list.h:929 [inline]  enqueue_timer+0x18/0xa4 kernel/time/timer.c:605  mod_timer+0x14/0x20 kernel/time/timer.c:1161  mrp_periodic_timer_arm net/802/mrp.c:614 [inline]  mrp_periodic_timer+0xa0/0xc0 net/802/mrp.c:627  call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474  expire_timers+0x98/0xc4 kernel/time/timer.c:1519  To fix it, we can introduce a new active flags to make sure the timer will not restart.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.4-1 | [DEBIAN-CVE-2022-50697](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50697.md) | Dec 24, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.1.4-1 | [DEBIAN-CVE-2022-50697](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50697.md) | Dec 24, 2025 |
| Linux | linux Debian 14 | 6.1.4-1 | [DEBIAN-CVE-2022-50697](https://patchblox.com/security/data/fix/linux/debian-cve-2022-50697.md) | Dec 24, 2025 |

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