Vulnerability-Lookup

FKIE_CVE-2026-93173

Vulnerability from fkie_nvd - Published: 2026-09-17 17:18 - Updated: 2026-09-17 17:18

Severity

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks __bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs. security_bpf_prog_free() called from there fires bpf_prog_free in softirq; if a sleepable LSM prog is attached to that hook, might_fault() BUGs: BUG: sleeping function called from invalid context in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038 preempt_count: 101, expected: 0 Call Trace: <IRQ> __bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255 bpf_trampoline_6442549705+0x53/0xd7 security_bpf_prog_free+0xde/0x130 security/security.c:5465 __bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365 rcu_do_batch kernel/rcu/tree.c:2617 [inline] handle_softirqs+0x236/0x800 kernel/softirq.c:622 </IRQ> The call_rcu/call_rcu_tasks_trace split reflects the freed program's sleepability, not that of any attached observer. security_bpf_prog_free() also frees prog->aux->security, which has to stay after the grace period, so drop bpf_prog_free from sleepable_lsm_hooks rather than move the call. Non-sleepable observers still run there.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/bpf_lsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2135f661fae7160a7fc603cab43cbc7999e8bfce",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            },
            {
              "lessThan": "d5f2f741a900123fbcb7c7c0a002b81306fbe242",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            },
            {
              "lessThan": "915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            },
            {
              "lessThan": "2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/bpf_lsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nbpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks\n\n__bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs.\nsecurity_bpf_prog_free() called from there fires bpf_prog_free in softirq;\nif a sleepable LSM prog is attached to that hook, might_fault() BUGs:\n\n  BUG: sleeping function called from invalid context\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038\n  preempt_count: 101, expected: 0\n  Call Trace:\n   \u003cIRQ\u003e\n   __bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255\n   bpf_trampoline_6442549705+0x53/0xd7\n   security_bpf_prog_free+0xde/0x130 security/security.c:5465\n   __bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365\n   rcu_do_batch kernel/rcu/tree.c:2617 [inline]\n   handle_softirqs+0x236/0x800 kernel/softirq.c:622\n   \u003c/IRQ\u003e\n\nThe call_rcu/call_rcu_tasks_trace split reflects the freed program\u0027s\nsleepability, not that of any attached observer.\n\nsecurity_bpf_prog_free() also frees prog-\u003eaux-\u003esecurity, which has to stay\nafter the grace period, so drop bpf_prog_free from sleepable_lsm_hooks\nrather than move the call. Non-sleepable observers still run there."
    }
  ],
  "id": "CVE-2026-93173",
  "lastModified": "2026-09-17T17:18:13.057",
  "metrics": {},
  "published": "2026-09-17T17:18:13.057",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-93173 (GCVE-0-2026-93173)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:12 – Updated: 2026-09-17 16:12

Title

bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks

Summary

Severity

No CVSS data available.

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/2135f661fae7160a7…
https://git.kernel.org/stable/c/d5f2f741a900123fb…
https://git.kernel.org/stable/c/915c2d9d69fc6c5f9…
https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1b67772e4e3f16cd647b229cae95fc06d120be08 , < 2135f661fae7160a7fc603cab43cbc7999e8bfce (git) Affected: 1b67772e4e3f16cd647b229cae95fc06d120be08 , < d5f2f741a900123fbcb7c7c0a002b81306fbe242 (git) Affected: 1b67772e4e3f16cd647b229cae95fc06d120be08 , < 915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62 (git) Affected: 1b67772e4e3f16cd647b229cae95fc06d120be08 , < 2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8 (git)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/bpf_lsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2135f661fae7160a7fc603cab43cbc7999e8bfce",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            },
            {
              "lessThan": "d5f2f741a900123fbcb7c7c0a002b81306fbe242",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            },
            {
              "lessThan": "915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            },
            {
              "lessThan": "2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8",
              "status": "affected",
              "version": "1b67772e4e3f16cd647b229cae95fc06d120be08",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/bpf/bpf_lsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "lessThan": "6.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks\n\n__bpf_prog_put_rcu() is the call_rcu() callback for non-sleepable programs.\nsecurity_bpf_prog_free() called from there fires bpf_prog_free in softirq;\nif a sleepable LSM prog is attached to that hook, might_fault() BUGs:\n\n  BUG: sleeping function called from invalid context\n  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5038\n  preempt_count: 101, expected: 0\n  Call Trace:\n   \u003cIRQ\u003e\n   __bpf_prog_enter_sleepable+0x1cd/0x320 kernel/bpf/trampoline.c:1255\n   bpf_trampoline_6442549705+0x53/0xd7\n   security_bpf_prog_free+0xde/0x130 security/security.c:5465\n   __bpf_prog_put_rcu+0xab/0xd0 kernel/bpf/syscall.c:2365\n   rcu_do_batch kernel/rcu/tree.c:2617 [inline]\n   handle_softirqs+0x236/0x800 kernel/softirq.c:622\n   \u003c/IRQ\u003e\n\nThe call_rcu/call_rcu_tasks_trace split reflects the freed program\u0027s\nsleepability, not that of any attached observer.\n\nsecurity_bpf_prog_free() also frees prog-\u003eaux-\u003esecurity, which has to stay\nafter the grace period, so drop bpf_prog_free from sleepable_lsm_hooks\nrather than move the call. Non-sleepable observers still run there."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-17T16:12:03.229Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2135f661fae7160a7fc603cab43cbc7999e8bfce"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5f2f741a900123fbcb7c7c0a002b81306fbe242"
        },
        {
          "url": "https://git.kernel.org/stable/c/915c2d9d69fc6c5f9f41d12bf4a9c51293aaee62"
        },
        {
          "url": "https://git.kernel.org/stable/c/2ce3f548cfc6a1fe4c53479cf8a21931cdfd51d8"
        }
      ],
      "title": "bpf,lsm: Drop bpf_prog_free from sleepable_lsm_hooks",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-93173",
    "datePublished": "2026-09-17T16:12:03.229Z",
    "dateReserved": "2026-09-17T16:02:15.090Z",
    "dateUpdated": "2026-09-17T16:12:03.229Z",
    "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.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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