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CVE-2024-40909 (GCVE-0-2024-40909)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2026-08-05 11:33
VLAI
Title
bpf: Fix a potential use-after-free in bpf_link_free()
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-09-10 17:06 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 876941f533e7b47fc69977fc4551c02f2d18af97 , < 91cff53136daeff50816b0baeafd38a6976f6209 (git)
Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < fa97b8fed9896f1e89cb657513e483a152d4c382 (git)
Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < 2884dc7d08d98a89d8d65121524bb7533183a63a (git)
Affected: 5d8d447777564b35f67000e7838e7ccb64d525c8 (git)
Affected: 6.6.26 , < 6.6.35 (semver)
Affected: 6.8.5 , < 6.9 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T18:47:39+00:00",
      "cve": "CVE-2024-40909",
      "id": "CVE-2024-40909",
      "initial_release_date": "2024-07-12T00:00:00+00:00",
      "product_status:known_affected": "28",
      "product_status:known_not_affected": "170",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bpf: Fix a potential use-after-free in bpf_link_free()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-40909.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-02T01:28:16Z",
      "cve": "CVE-2024-40909",
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      "initial_release_date": "2024-07-16T02:35:01Z",
      "product_status:known_affected": "330",
      "product_status:known_not_affected": "292",
      "product_status:recommended": "667",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-40909",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-40909.json",
      "version": "117"
    },
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      "cveMetadata": "{\"cveId\": \"CVE-2024-40909\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-23T15:50:39.144Z\", \"dateReserved\": \"2024-07-12T12:17:45.580Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-07-12T12:20:48.447Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.