FKIE_CVE-2022-50697

Vulnerability from fkie_nvd - Published: 2025-12-24 11:15 - Updated: 2025-12-29 15:58
Severity ?
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6
Impacted products
Vendor Product Version
To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmrp: introduce active flags to prevent UAF when applicant uninit\n\nThe caller of del_timer_sync must prevent restarting of the timer, If\nwe have no this synchronization, there is a small probability that the\ncancellation will not be successful.\n\nAnd syzbot report the fellowing crash:\n==================================================================\nBUG: KASAN: use-after-free in hlist_add_head include/linux/list.h:929 [inline]\nBUG: KASAN: use-after-free in enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\nWrite at addr f9ff000024df6058 by task syz-fuzzer/2256\nPointer tag: [f9], memory tag: [fe]\n\nCPU: 1 PID: 2256 Comm: syz-fuzzer Not tainted 6.1.0-rc5-syzkaller-00008-\nge01d50cbd6ee #0\nHardware name: linux,dummy-virt (DT)\nCall trace:\n dump_backtrace.part.0+0xe0/0xf0 arch/arm64/kernel/stacktrace.c:156\n dump_backtrace arch/arm64/kernel/stacktrace.c:162 [inline]\n show_stack+0x18/0x40 arch/arm64/kernel/stacktrace.c:163\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x68/0x84 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x1a8/0x4a0 mm/kasan/report.c:395\n kasan_report+0x94/0xb4 mm/kasan/report.c:495\n __do_kernel_fault+0x164/0x1e0 arch/arm64/mm/fault.c:320\n do_bad_area arch/arm64/mm/fault.c:473 [inline]\n do_tag_check_fault+0x78/0x8c arch/arm64/mm/fault.c:749\n do_mem_abort+0x44/0x94 arch/arm64/mm/fault.c:825\n el1_abort+0x40/0x60 arch/arm64/kernel/entry-common.c:367\n el1h_64_sync_handler+0xd8/0xe4 arch/arm64/kernel/entry-common.c:427\n el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576\n hlist_add_head include/linux/list.h:929 [inline]\n enqueue_timer+0x18/0xa4 kernel/time/timer.c:605\n mod_timer+0x14/0x20 kernel/time/timer.c:1161\n mrp_periodic_timer_arm net/802/mrp.c:614 [inline]\n mrp_periodic_timer+0xa0/0xc0 net/802/mrp.c:627\n call_timer_fn.constprop.0+0x24/0x80 kernel/time/timer.c:1474\n expire_timers+0x98/0xc4 kernel/time/timer.c:1519\n\nTo fix it, we can introduce a new active flags to make sure the timer will\nnot restart."
    }
  ],
  "id": "CVE-2022-50697",
  "lastModified": "2025-12-29T15:58:56.260",
  "metrics": {},
  "published": "2025-12-24T11:15:48.833",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1a185fe83c2a60c1e3596fb9d82dbeb148dc09c6"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/563e45fd5046045cc194af3ba17f5423e1c98170"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5d5a481a7fd0234f617535dc464ea010804a1129"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/755eb0879224ffc2a43de724554aeaf0e51e5a64"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/78d48bc41f7726113c9f114268d3ab11212814da"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/98f53e591940e4c3818be358c5dc684d5b30cb56"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aacffc1a8dbf67c5463cb4f67b37143c01ca6fa9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/aadb1507a77b060c529edfeaf67f803e31461f24"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ab0377803dafc58f1e22296708c1c28e309414d6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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