mrp: introduce active flags to prevent UAF when applicant uninit

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.

Scores

EPSS (exploitation in 30 days)

0.16% · top 95% of all CVEs (6 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: total

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.

Affected products

• Linux · Linux

  • affected febf018d22347b5df94066bca05d0c11a84e839d – < 98f53e591940e4c3818be358c5dc684d5b30cb56
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < 78d48bc41f7726113c9f114268d3ab11212814da
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < aadb1507a77b060c529edfeaf67f803e31461f24
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < 755eb0879224ffc2a43de724554aeaf0e51e5a64
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < 5d5a481a7fd0234f617535dc464ea010804a1129
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < 1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < 563e45fd5046045cc194af3ba17f5423e1c98170
  • affected febf018d22347b5df94066bca05d0c11a84e839d – < ab0377803dafc58f1e22296708c1c28e309414d6

• Linux · Linux

  • affected 3.9
  • unaffected < 3.9
  • unaffected 4.9.337 – ≤ 4.9.*
  • unaffected 4.14.303 – ≤ 4.14.*
  • unaffected 4.19.270 – ≤ 4.19.*
  • unaffected 5.4.229 – ≤ 5.4.*
  • unaffected 5.10.163 – ≤ 5.10.*
  • unaffected 5.15.86 – ≤ 5.15.*
  • unaffected 6.0.16 – ≤ 6.0.*
  • unaffected 6.1.2 – ≤ 6.1.*
  • unaffected 6.2 – ≤ *

References (9)

• https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56 (opens in a new tab)
• https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9 (opens in a new tab)
• https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da (opens in a new tab)
• https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24 (opens in a new tab)
• https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64 (opens in a new tab)
• https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129 (opens in a new tab)
• https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6 (opens in a new tab)
• https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170 (opens in a new tab)
• https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6 (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

[![CVE-2022-50697](https://trackcve.app/badge/CVE-2022-50697.svg)](https://trackcve.app/cve/CVE-2022-50697)

Record last updated 15 Oct 2026, 21:41 UTC.