Vulnerability-Lookup

FKIE_CVE-2026-74477

Vulnerability from fkie_nvd - Published: 2026-08-15 13:17 - Updated: 2026-08-17 06:19

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: uprobes: Fix NULL pointer dereference in hprobe_expire() Forking a task that has a pending uretprobe can oops the kernel with a NULL pointer dereference in the clone() path: BUG: kernel NULL pointer dereference, address: 0000000000000018 Oops: 0002 [#1] SMP NOPTI RIP: 0010:hprobe_expire CR2: 0000000000000018 Call Trace: uprobe_copy_process copy_process kernel_clone __x64_sys_clone do_syscall_64 entry_SYSCALL_64_after_hwframe This was found on real hosts on Meta fleet. I've got the impression that this is what is happening: CPU 1 CPU 2 (traced task) ----- ------------------- hit uprobe, prepare_uretprobe(): hprobe LEASED, refcount >= 1 uprobe_unregister() put_uprobe(): refcount -> 0 fork() -> dup_utask() hprobe_expire(hprobe, true) try_get_uprobe() -> NULL get_uprobe(NULL) <-- Oops Only take the extra reference when the uprobe is non-NULL; a NULL means it is gone and is the correct value to return.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/uprobes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3bd35a5e272a1b7a3fb43acad9bdc599281b13fa",
              "status": "affected",
              "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb",
              "versionType": "git"
            },
            {
              "lessThan": "06c275a6c0a953ef1d763d11a6891fcc69ae2ac0",
              "status": "affected",
              "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb",
              "versionType": "git"
            },
            {
              "lessThan": "cc679d7a6303e84d769f2afcde1fc51c51f127cd",
              "status": "affected",
              "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/uprobes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "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\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  Oops: 0002 [#1] SMP NOPTI\n  RIP: 0010:hprobe_expire\n  CR2: 0000000000000018\n  Call Trace:\n   uprobe_copy_process\n   copy_process\n   kernel_clone\n   __x64_sys_clone\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI\u0027ve got the impression that this is what is happening:\n\n  CPU 1                          CPU 2 (traced task)\n  -----                          -------------------\n                                 hit uprobe, prepare_uretprobe():\n                                   hprobe LEASED, refcount \u003e= 1\n  uprobe_unregister()\n    put_uprobe(): refcount -\u003e 0\n                                 fork() -\u003e dup_utask()\n                                   hprobe_expire(hprobe, true)\n                                     try_get_uprobe() -\u003e NULL\n                                     get_uprobe(NULL)   \u003c-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return."
    }
  ],
  "id": "CVE-2026-74477",
  "lastModified": "2026-08-17T06:19:43.777",
  "metrics": {},
  "published": "2026-08-15T13:17:52.497",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-74477 (GCVE-0-2026-74477)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:27 – Updated: 2026-08-17 05:20

Title

uprobes: Fix NULL pointer dereference in hprobe_expire()

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

3 references

URL	Tags
https://git.kernel.org/stable/c/3bd35a5e272a1b7a3…
https://git.kernel.org/stable/c/06c275a6c0a953ef1…
https://git.kernel.org/stable/c/cc679d7a6303e84d7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: dd1a7567784e2b1f80258be04f57bcfa82c997eb , < 3bd35a5e272a1b7a3fb43acad9bdc599281b13fa (git) Affected: dd1a7567784e2b1f80258be04f57bcfa82c997eb , < 06c275a6c0a953ef1d763d11a6891fcc69ae2ac0 (git) Affected: dd1a7567784e2b1f80258be04f57bcfa82c997eb , < cc679d7a6303e84d769f2afcde1fc51c51f127cd (git)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 6.18.44 , ≤ 6.18.* (semver) Unaffected: 7.1.8 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/uprobes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3bd35a5e272a1b7a3fb43acad9bdc599281b13fa",
              "status": "affected",
              "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb",
              "versionType": "git"
            },
            {
              "lessThan": "06c275a6c0a953ef1d763d11a6891fcc69ae2ac0",
              "status": "affected",
              "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb",
              "versionType": "git"
            },
            {
              "lessThan": "cc679d7a6303e84d769f2afcde1fc51c51f127cd",
              "status": "affected",
              "version": "dd1a7567784e2b1f80258be04f57bcfa82c997eb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/events/uprobes.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.44",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.8",
              "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": "6.18.44",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.8",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nuprobes: Fix NULL pointer dereference in hprobe_expire()\n\nForking a task that has a pending uretprobe can oops the kernel with a\nNULL pointer dereference in the clone() path:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000018\n  Oops: 0002 [#1] SMP NOPTI\n  RIP: 0010:hprobe_expire\n  CR2: 0000000000000018\n  Call Trace:\n   uprobe_copy_process\n   copy_process\n   kernel_clone\n   __x64_sys_clone\n   do_syscall_64\n   entry_SYSCALL_64_after_hwframe\n\nThis was found on real hosts on Meta fleet.\n\nI\u0027ve got the impression that this is what is happening:\n\n  CPU 1                          CPU 2 (traced task)\n  -----                          -------------------\n                                 hit uprobe, prepare_uretprobe():\n                                   hprobe LEASED, refcount \u003e= 1\n  uprobe_unregister()\n    put_uprobe(): refcount -\u003e 0\n                                 fork() -\u003e dup_utask()\n                                   hprobe_expire(hprobe, true)\n                                     try_get_uprobe() -\u003e NULL\n                                     get_uprobe(NULL)   \u003c-- Oops\n\nOnly take the extra reference when the uprobe is non-NULL; a NULL means\nit is gone and is the correct value to return."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:20:09.952Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3bd35a5e272a1b7a3fb43acad9bdc599281b13fa"
        },
        {
          "url": "https://git.kernel.org/stable/c/06c275a6c0a953ef1d763d11a6891fcc69ae2ac0"
        },
        {
          "url": "https://git.kernel.org/stable/c/cc679d7a6303e84d769f2afcde1fc51c51f127cd"
        }
      ],
      "title": "uprobes: Fix NULL pointer dereference in hprobe_expire()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74477",
    "datePublished": "2026-08-15T12:27:11.938Z",
    "dateReserved": "2026-08-15T05:44:03.903Z",
    "dateUpdated": "2026-08-17T05:20:09.952Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

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FKIE_CVE-2026-74477

CVE-2026-74477 (GCVE-0-2026-74477)

Tags

Sightings

Nomenclature