FKIE_CVE-2025-68798

Vulnerability from fkie_nvd - Published: 2026-01-13 16:16 - Updated: 2026-01-14 16:26
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: perf/x86/amd: Check event before enable to avoid GPF On AMD machines cpuc->events[idx] can become NULL in a subtle race condition with NMI->throttle->x86_pmu_stop(). Check event for NULL in amd_pmu_enable_all() before enable to avoid a GPF. This appears to be an AMD only issue. Syzkaller reported a GPF in amd_pmu_enable_all. INFO: NMI handler (perf_event_nmi_handler) took too long to run: 13.143 msecs Oops: general protection fault, probably for non-canonical address 0xdffffc0000000034: 0000 PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000001a0-0x00000000000001a7] CPU: 0 UID: 0 PID: 328415 Comm: repro_36674776 Not tainted 6.12.0-rc1-syzk RIP: 0010:x86_pmu_enable_event (arch/x86/events/perf_event.h:1195 arch/x86/events/core.c:1430) RSP: 0018:ffff888118009d60 EFLAGS: 00010012 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000034 RSI: 0000000000000000 RDI: 00000000000001a0 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002 R13: ffff88811802a440 R14: ffff88811802a240 R15: ffff8881132d8601 FS: 00007f097dfaa700(0000) GS:ffff888118000000(0000) GS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200001c0 CR3: 0000000103d56000 CR4: 00000000000006f0 Call Trace: <IRQ> amd_pmu_enable_all (arch/x86/events/amd/core.c:760 (discriminator 2)) x86_pmu_enable (arch/x86/events/core.c:1360) event_sched_out (kernel/events/core.c:1191 kernel/events/core.c:1186 kernel/events/core.c:2346) __perf_remove_from_context (kernel/events/core.c:2435) event_function (kernel/events/core.c:259) remote_function (kernel/events/core.c:92 (discriminator 1) kernel/events/core.c:72 (discriminator 1)) __flush_smp_call_function_queue (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./include/trace/events/csd.h:64 kernel/smp.c:135 kernel/smp.c:540) __sysvec_call_function_single (./arch/x86/include/asm/jump_label.h:27 ./include/linux/jump_label.h:207 ./arch/x86/include/asm/trace/irq_vectors.h:99 arch/x86/kernel/smp.c:272) sysvec_call_function_single (arch/x86/kernel/smp.c:266 (discriminator 47) arch/x86/kernel/smp.c:266 (discriminator 47)) </IRQ>
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/43c2e5c2acaae50e99d1c20a5a46e367c442fb3b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/49324a0c40f7e9bae1bd0362d23fc42232e14621
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6e41d9ec8d7cc3f01b9ba785e05f0ebef8b3b37f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/866cf36bfee4fba6a492d2dcc5133f857e3446b0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e1028fb38b328084bc683a4efb001c95d3108573
Impacted products
Vendor Product Version
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{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/x86/amd: Check event before enable to avoid GPF\n\nOn AMD machines cpuc-\u003eevents[idx] can become NULL in a subtle race\ncondition with NMI-\u003ethrottle-\u003ex86_pmu_stop().\n\nCheck event for NULL in amd_pmu_enable_all() before enable to avoid a GPF.\nThis appears to be an AMD only issue.\n\nSyzkaller reported a GPF in amd_pmu_enable_all.\n\nINFO: NMI handler (perf_event_nmi_handler) took too long to run: 13.143\n    msecs\nOops: general protection fault, probably for non-canonical address\n    0xdffffc0000000034: 0000  PREEMPT SMP KASAN NOPTI\nKASAN: null-ptr-deref in range [0x00000000000001a0-0x00000000000001a7]\nCPU: 0 UID: 0 PID: 328415 Comm: repro_36674776 Not tainted 6.12.0-rc1-syzk\nRIP: 0010:x86_pmu_enable_event (arch/x86/events/perf_event.h:1195\n    arch/x86/events/core.c:1430)\nRSP: 0018:ffff888118009d60 EFLAGS: 00010012\nRAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000\nRDX: 0000000000000034 RSI: 0000000000000000 RDI: 00000000000001a0\nRBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000002\nR13: ffff88811802a440 R14: ffff88811802a240 R15: ffff8881132d8601\nFS:  00007f097dfaa700(0000) GS:ffff888118000000(0000) GS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00000000200001c0 CR3: 0000000103d56000 CR4: 00000000000006f0\nCall Trace:\n \u003cIRQ\u003e\namd_pmu_enable_all (arch/x86/events/amd/core.c:760 (discriminator 2))\nx86_pmu_enable (arch/x86/events/core.c:1360)\nevent_sched_out (kernel/events/core.c:1191 kernel/events/core.c:1186\n    kernel/events/core.c:2346)\n__perf_remove_from_context (kernel/events/core.c:2435)\nevent_function (kernel/events/core.c:259)\nremote_function (kernel/events/core.c:92 (discriminator 1)\n    kernel/events/core.c:72 (discriminator 1))\n__flush_smp_call_function_queue (./arch/x86/include/asm/jump_label.h:27\n    ./include/linux/jump_label.h:207 ./include/trace/events/csd.h:64\n    kernel/smp.c:135 kernel/smp.c:540)\n__sysvec_call_function_single (./arch/x86/include/asm/jump_label.h:27\n    ./include/linux/jump_label.h:207\n    ./arch/x86/include/asm/trace/irq_vectors.h:99 arch/x86/kernel/smp.c:272)\nsysvec_call_function_single (arch/x86/kernel/smp.c:266 (discriminator 47)\n    arch/x86/kernel/smp.c:266 (discriminator 47))\n \u003c/IRQ\u003e"
    }
  ],
  "id": "CVE-2025-68798",
  "lastModified": "2026-01-14T16:26:00.933",
  "metrics": {},
  "published": "2026-01-13T16:16:01.770",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/43c2e5c2acaae50e99d1c20a5a46e367c442fb3b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/49324a0c40f7e9bae1bd0362d23fc42232e14621"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6e41d9ec8d7cc3f01b9ba785e05f0ebef8b3b37f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/866cf36bfee4fba6a492d2dcc5133f857e3446b0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e1028fb38b328084bc683a4efb001c95d3108573"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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