CVE-2026-80730 (GCVE-0-2026-80730)

Vulnerability from cvelistv5 – Published: 2026-09-03 08:21 – Updated: 2026-09-03 08:21
VLAI
Title
ring-buffer: Fix crash passing ERR_PTR to kthread_stop()
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 64ed3a049e3e81b801e7c5bb052416152443f585 , < 51d78fad30dd9ae45721224103662bdbcf210096 (git)
Affected: 64ed3a049e3e81b801e7c5bb052416152443f585 , < 93e7044b548a72022208595d2c1b188bb225ce83 (git)
Affected: 64ed3a049e3e81b801e7c5bb052416152443f585 , < 8532983c312e8b875d7c9e440f8ee4674ea4b711 (git)
Affected: 64ed3a049e3e81b801e7c5bb052416152443f585 , < 6dd7a06894d6d3dc84319bd0b7d1a7c27df9d902 (git)
Affected: 64ed3a049e3e81b801e7c5bb052416152443f585 , < 3ea2fd344d93e3cf9503739b09fd702c0d8f8f0b (git)
Affected: 64ed3a049e3e81b801e7c5bb052416152443f585 , < 91542863abade2fd4f2b361991f5386ad9d19c8c (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.17
Unaffected: 0 , < 5.17 (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.152 , ≤ 6.6.* (semver)
Unaffected: 6.12.104 , ≤ 6.12.* (semver)
Unaffected: 6.18.45 , ≤ 6.18.* (semver)
Unaffected: 7.1.9 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.183",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.152",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.104",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.45",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.9",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "5.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-03T08:21:48.325Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/51d78fad30dd9ae45721224103662bdbcf210096"
        },
        {
          "url": "https://git.kernel.org/stable/c/93e7044b548a72022208595d2c1b188bb225ce83"
        },
        {
          "url": "https://git.kernel.org/stable/c/8532983c312e8b875d7c9e440f8ee4674ea4b711"
        },
        {
          "url": "https://git.kernel.org/stable/c/6dd7a06894d6d3dc84319bd0b7d1a7c27df9d902"
        },
        {
          "url": "https://git.kernel.org/stable/c/3ea2fd344d93e3cf9503739b09fd702c0d8f8f0b"
        },
        {
          "url": "https://git.kernel.org/stable/c/91542863abade2fd4f2b361991f5386ad9d19c8c"
        }
      ],
      "title": "ring-buffer: Fix crash passing ERR_PTR to kthread_stop()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80730",
    "datePublished": "2026-09-03T08:21:48.325Z",
    "dateReserved": "2026-08-26T14:34:25.789Z",
    "dateUpdated": "2026-09-03T08:21:48.325Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-80730",
      "date": "2026-09-20",
      "epss": "0.00205",
      "percentile": "0.10916"
    },
    "microsoft_vex": {
      "current_release_date": "2026-09-11T01:46:56.000Z",
      "cve": "CVE-2026-80730",
      "id": "msrc_CVE-2026-80730",
      "initial_release_date": "2026-09-04T01:05:20.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "ring-buffer: Fix crash passing ERR_PTR to kthread_stop()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-80730.json",
      "version": "2"
    },
    "nvd": {
      "cve": {
        "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"
      }
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.