FKIE_CVE-2026-80730

Vulnerability from fkie_nvd - Published: 2026-09-03 13:06 - Updated: 2026-09-03 13:06
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: ring-buffer: Fix crash passing ERR_PTR to kthread_stop() In test_ringbuffer()'s out_free cleanup loop, the check `!rb_threads[cpu]` only catches NULL entries and misses entries that hold an ERR_PTR. rb_threads[] is static, so unassigned slots are NULL. But when kthread_run_on_cpu() fails for a cpu, it stores ERR_PTR(-ENOMEM) (or -EINTR) in rb_threads[cpu] before the creation loop jumps to out_free. That entry is non-NULL, so the old `!ptr` check does not break, and the cleanup proceeds to call kthread_stop() on the ERR_PTR. kthread_stop() then dereferences the bogus pointer, crashing the kernel during the late_initcall self-test. crash logs: BUG: kernel NULL pointer dereference, address: 000000000000001c Oops: 0002 [#1] SMP NOPTI CPU: 1 PID: 1 Comm: swapper/0 Not tainted 7.2.0-rc6-dirty #7 PREEMPT(lazy) RIP: 0010:kthread_stop+0x2e/0x220 RBX: fffffffffffffff4 CR2: 000000000000001c Call Trace: <TASK> test_ringbuffer+0x1ec/0x650 do_one_initcall+0x6c/0x2c0 kernel_init_freeable+0x21d/0x420 kernel_init+0x15/0x1c0 ret_from_fork+0x21b/0x320 </TASK> Kernel panic - not syncing: Fatal exception
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ea2fd344d93e3cf9503739b09fd702c0d8f8f0b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/51d78fad30dd9ae45721224103662bdbcf210096
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6dd7a06894d6d3dc84319bd0b7d1a7c27df9d902
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8532983c312e8b875d7c9e440f8ee4674ea4b711
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/91542863abade2fd4f2b361991f5386ad9d19c8c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/93e7044b548a72022208595d2c1b188bb225ce83
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/ring_buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "51d78fad30dd9ae45721224103662bdbcf210096",
              "status": "affected",
              "version": "64ed3a049e3e81b801e7c5bb052416152443f585",
              "versionType": "git"
            },
            {
              "lessThan": "93e7044b548a72022208595d2c1b188bb225ce83",
              "status": "affected",
              "version": "64ed3a049e3e81b801e7c5bb052416152443f585",
              "versionType": "git"
            },
            {
              "lessThan": "8532983c312e8b875d7c9e440f8ee4674ea4b711",
              "status": "affected",
              "version": "64ed3a049e3e81b801e7c5bb052416152443f585",
              "versionType": "git"
            },
            {
              "lessThan": "6dd7a06894d6d3dc84319bd0b7d1a7c27df9d902",
              "status": "affected",
              "version": "64ed3a049e3e81b801e7c5bb052416152443f585",
              "versionType": "git"
            },
            {
              "lessThan": "3ea2fd344d93e3cf9503739b09fd702c0d8f8f0b",
              "status": "affected",
              "version": "64ed3a049e3e81b801e7c5bb052416152443f585",
              "versionType": "git"
            },
            {
              "lessThan": "91542863abade2fd4f2b361991f5386ad9d19c8c",
              "status": "affected",
              "version": "64ed3a049e3e81b801e7c5bb052416152443f585",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/ring_buffer.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.17"
            },
            {
              "lessThan": "5.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.152",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.104",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nring-buffer: Fix crash passing ERR_PTR to kthread_stop()\n\nIn test_ringbuffer()\u0027s out_free cleanup loop, the check\n`!rb_threads[cpu]` only catches NULL entries and misses entries that\nhold an ERR_PTR.\n\nrb_threads[] is static, so unassigned slots are NULL. But when\nkthread_run_on_cpu() fails for a cpu, it stores ERR_PTR(-ENOMEM) (or\n-EINTR) in rb_threads[cpu] before the creation loop jumps to out_free.\nThat entry is non-NULL, so the old `!ptr` check does not break, and the\ncleanup proceeds to call kthread_stop() on the ERR_PTR. kthread_stop()\nthen dereferences the bogus pointer, crashing the kernel during the\nlate_initcall self-test.\n\ncrash logs:\n  BUG: kernel NULL pointer dereference, address: 000000000000001c\n  Oops: 0002 [#1] SMP NOPTI\n  CPU: 1 PID: 1 Comm: swapper/0 Not tainted 7.2.0-rc6-dirty #7 PREEMPT(lazy)\n  RIP: 0010:kthread_stop+0x2e/0x220\n  RBX: fffffffffffffff4\n  CR2: 000000000000001c\n  Call Trace:\n   \u003cTASK\u003e\n   test_ringbuffer+0x1ec/0x650\n   do_one_initcall+0x6c/0x2c0\n   kernel_init_freeable+0x21d/0x420\n   kernel_init+0x15/0x1c0\n   ret_from_fork+0x21b/0x320\n   \u003c/TASK\u003e\n  Kernel panic - not syncing: Fatal exception"
    }
  ],
  "id": "CVE-2026-80730",
  "lastModified": "2026-09-03T13:06:11.550",
  "metrics": {},
  "published": "2026-09-03T13:06:11.550",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3ea2fd344d93e3cf9503739b09fd702c0d8f8f0b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/51d78fad30dd9ae45721224103662bdbcf210096"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6dd7a06894d6d3dc84319bd0b7d1a7c27df9d902"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8532983c312e8b875d7c9e440f8ee4674ea4b711"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/91542863abade2fd4f2b361991f5386ad9d19c8c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/93e7044b548a72022208595d2c1b188bb225ce83"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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