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CVE-2025-40078 (GCVE-0-2025-40078)

Vulnerability from cvelistv5 – Published: 2025-10-28 11:48 – Updated: 2026-09-08 08:42
VLAI
Title
bpf: Explicitly check accesses to bpf_sock_addr
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: Explicitly check accesses to bpf_sock_addr Syzkaller found a kernel warning on the following sock_addr program: 0: r0 = 0 1: r2 = *(u32 *)(r1 +60) 2: exit which triggers: verifier bug: error during ctx access conversion (0) This is happening because offset 60 in bpf_sock_addr corresponds to an implicit padding of 4 bytes, right after msg_src_ip4. Access to this padding isn't rejected in sock_addr_is_valid_access and it thus later fails to convert the access. This patch fixes it by explicitly checking the various fields of bpf_sock_addr in sock_addr_is_valid_access. I checked the other ctx structures and is_valid_access functions and didn't find any other similar cases. Other cases of (properly handled) padding are covered in new tests in a subsequent patch.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < de44cdc50d2dce8718cb57deddf9cf1be9a7759f (git)
Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < 76e04bbb4296fb6eac084dbfc27e02ccc744db3e (git)
Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < 6d8b1a21fd5c34622b0c3893c61e4a38d8ba53ec (git)
Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < 4f00858cd9bbbdf67159e28b85a8ca9e77c83622 (git)
Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < cdeafacb4f9ff261a96baef519e29480fd7b1019 (git)
Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < fe9d33f0470350558cb08cecb54cf2267b3a45d2 (git)
Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69 (git)
Affected: 1cedee13d25ab118d325f95588c1a084e9317229 , < 6fabca2fc94d33cdf7ec102058983b086293395f (git)
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Linux Linux Affected: 4.18
Unaffected: 0 , < 4.18 (semver)
Unaffected: 5.4.301 , ≤ 5.4.* (semver)
Unaffected: 5.10.246 , ≤ 5.10.* (semver)
Unaffected: 5.15.195 , ≤ 5.15.* (semver)
Unaffected: 6.1.156 , ≤ 6.1.* (semver)
Unaffected: 6.6.112 , ≤ 6.6.* (semver)
Unaffected: 6.12.53 , ≤ 6.12.* (semver)
Unaffected: 6.17.3 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
guessed Create a notification for this product.
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ad8b4fe5617e3c85fc23267f02500c4f3bf0ff69"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/cdeafacb4f9ff261a96baef519e29480fd7b1019"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/de44cdc50d2dce8718cb57deddf9cf1be9a7759f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/fe9d33f0470350558cb08cecb54cf2267b3a45d2"
          },
          {
            "source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
            "url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-30T10:27:53+00:00",
      "cve": "CVE-2025-40078",
      "id": "CVE-2025-40078",
      "initial_release_date": "2025-10-28T00:00:00+00:00",
      "product_status:known_affected": "246",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel: Denial of Service via improper access validation in bpf_sock_addr",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40078.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-11T01:55:59Z",
      "cve": "CVE-2025-40078",
      "id": "CVE-2025-40078",
      "initial_release_date": "2025-10-29T00:24:38Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "630",
      "product_status:known_not_affected": "96",
      "product_status:recommended": "493",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40078",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40078.json",
      "version": "52"
    }
  }
}



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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.