CVE-2026-74689 (GCVE-0-2026-74689)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41
VLAI
Title
net/atm: fix slab-out-of-bounds read in vcc_setsockopt()
Summary
In the Linux kernel, the following vulnerability has been resolved: net/atm: fix slab-out-of-bounds read in vcc_setsockopt() vcc_setsockopt() contained an ineffective optlen check: if (__SO_LEVEL_MATCH(optname, level) && optlen != __SO_SIZE(optname)) return -EINVAL; If __SO_LEVEL_MATCH(optname, level) evaluated to false (e.g. if the caller passed a mismatched level), the length check optlen != __SO_SIZE(optname) was short-circuited and bypassed. Execution then fell through to switch(optname), calling copy_from_sockptr() assuming optval contained sufficient space. Furthermore, even if level matched, a cgroup BPF setsockopt filter could shrink optlen after entry. Because copy_from_sockptr() on kernel pointers uses memcpy(), this leads to a KASAN slab-out-of-bounds read when optlen is smaller than the expected structure size. Fix this by using copy_safe_from_sockptr(), which unconditionally validates that optlen is at least the expected size before copying. Also change the local 'value' variable type from 'unsigned long' to 'int' so that SO_SETCLP matches its sizeof(int) ABI encoding on 64-bit systems.
Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6665 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b3bcd5d65ac03c15787b2a5b36c718e26a689336 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 35f258fee9ed358c6d0f57f91c30bf029c3724af (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 6eb6af88710977eb529b558a07294874d8c40c4d (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9f77c1ab382188f5b51982fab6d913443b6dc59f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2c5988c7349c0b64a7e0441bfc6e1dca54f7116a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/atm: fix slab-out-of-bounds read in vcc_setsockopt()\n\nvcc_setsockopt() contained an ineffective optlen check:\n  if (__SO_LEVEL_MATCH(optname, level) \u0026\u0026 optlen != __SO_SIZE(optname))\n      return -EINVAL;\n\nIf __SO_LEVEL_MATCH(optname, level) evaluated to false (e.g. if the caller\npassed a mismatched level), the length check optlen != __SO_SIZE(optname)\nwas short-circuited and bypassed. Execution then fell through to switch(optname),\ncalling copy_from_sockptr() assuming optval contained sufficient space.\n\nFurthermore, even if level matched, a cgroup BPF setsockopt filter could shrink\noptlen after entry. Because copy_from_sockptr() on kernel pointers uses memcpy(),\nthis leads to a KASAN slab-out-of-bounds read when optlen is smaller than the\nexpected structure size.\n\nFix this by using copy_safe_from_sockptr(), which unconditionally validates\nthat optlen is at least the expected size before copying. Also change the local\n\u0027value\u0027 variable type from \u0027unsigned long\u0027 to \u0027int\u0027 so that SO_SETCLP matches\nits sizeof(int) ABI encoding on 64-bit systems."
        }
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            "version": "3.1"
          },
          "scenarios": [
            {
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              "value": "AV:L - The bug is reached only via the local setsockopt(2) syscall on an AF_ATMPVC/AF_ATMSVC socket (do_sock_setsockopt -\u003e pvc_setsockopt/svc_setsockopt -\u003e vcc_setsockopt); no remote ATM packet or network-facing handler invokes this path.\nAC:L - The attacker fully controls level, optname, and optlen; passing a mismatched level bypasses the short-circuited length check, and cgroup BPF setsockopt can shrink optlen after entry, deterministically triggering a full-size memcpy past a small kmalloc buffer with no race.\nPR:L - No capability check guards SO_ATMQOS or SO_SETCLP on unconnected ATM sockets; any unprivileged local user in init_net (required because ATM socket creation rejects non-init network namespaces) can open AF_ATMPVC sockets and issue the crafted setsockopt without CAP_NET_ADMIN.\nUI:N - The attacker triggers the out-of-bounds read entirely from their own process with a single crafted setsockopt call; no victim interaction or cooperation is required.\nS:U - Impact is kernel heap memory disclosure and potential crash within the host kernel security boundary; no VM escape, IOMMU bypass, or cross-sandbox boundary crossing occurs.\nC:H - copy_from_sockptr() performs a slab-out-of-bounds read of up to 92 bytes (struct atm_qos) or 8 bytes (SO_SETCLP) past a kmalloc buffer into kernel stack memory; adjacent slab contents can populate vcc-\u003eqos and be retrieved via subsequent SO_ATMQOS getsockopt.\nI:N - The defect is a pure out-of-bounds read with no arbitrary kernel write, heap corruption, or control-flow hijack primitive; although leaked bytes may influence vcc-\u003eqos if validation passes, no attacker-controlled data modification occurs.\nA:H - The KASAN-reported slab-out-of-bounds read triggers kernel oops on hardened kernels, and reading past a small kmalloc object into adjacent slab memory on production kernels risks faulting on unmapped redzone pages or corrupting adjacent objects leading to panic."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-25T05:41:33.932Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/6eb6af88710977eb529b558a07294874d8c40c4d"
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        {
          "url": "https://git.kernel.org/stable/c/d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3"
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      ],
      "title": "net/atm: fix slab-out-of-bounds read in vcc_setsockopt()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74689",
    "datePublished": "2026-08-22T15:32:54.034Z",
    "dateReserved": "2026-08-15T05:44:03.926Z",
    "dateUpdated": "2026-08-25T05:41:33.932Z",
    "state": "PUBLISHED"
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      "percentile": "0.02893"
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net/atm: fix slab-out-of-bounds read in vcc_setsockopt()",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-74689.json",
      "version": "4"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/atm: fix slab-out-of-bounds read in vcc_setsockopt()\n\nvcc_setsockopt() contained an ineffective optlen check:\n  if (__SO_LEVEL_MATCH(optname, level) \u0026\u0026 optlen != __SO_SIZE(optname))\n      return -EINVAL;\n\nIf __SO_LEVEL_MATCH(optname, level) evaluated to false (e.g. if the caller\npassed a mismatched level), the length check optlen != __SO_SIZE(optname)\nwas short-circuited and bypassed. Execution then fell through to switch(optname),\ncalling copy_from_sockptr() assuming optval contained sufficient space.\n\nFurthermore, even if level matched, a cgroup BPF setsockopt filter could shrink\noptlen after entry. Because copy_from_sockptr() on kernel pointers uses memcpy(),\nthis leads to a KASAN slab-out-of-bounds read when optlen is smaller than the\nexpected structure size.\n\nFix this by using copy_safe_from_sockptr(), which unconditionally validates\nthat optlen is at least the expected size before copying. Also change the local\n\u0027value\u0027 variable type from \u0027unsigned long\u0027 to \u0027int\u0027 so that SO_SETCLP matches\nits sizeof(int) ABI encoding on 64-bit systems."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet/atm: corrige lectura fuera de l\u00edmites de slab en vcc_setsockopt()\n\nvcc_setsockopt() conten\u00eda una comprobaci\u00f3n de optlen ineficaz:\n  if (__SO_LEVEL_MATCH(optname, level) \u0026\u0026 optlen != __SO_SIZE(optname))\n      return -EINVAL;\n\nSi __SO_LEVEL_MATCH(optname, level) evaluaba a falso (por ejemplo, si el llamador pasaba un nivel no coincidente), la comprobaci\u00f3n de longitud optlen != __SO_SIZE(optname) era cortocircuitada y omitida. La ejecuci\u00f3n entonces pasaba a switch(optname), llamando a copy_from_sockptr() asumiendo que optval conten\u00eda espacio suficiente.\n\nAdem\u00e1s, incluso si el nivel coincid\u00eda, un filtro setsockopt de cgroup BPF podr\u00eda reducir optlen despu\u00e9s de la entrada. Debido a que copy_from_sockptr() en punteros de kernel usa memcpy(), esto lleva a una lectura fuera de l\u00edmites de slab de KASAN cuando optlen es menor que el tama\u00f1o de estructura esperado.\n\nSolucione esto usando copy_safe_from_sockptr(), que valida incondicionalmente que optlen tiene al menos el tama\u00f1o esperado antes de copiar. Tambi\u00e9n cambie el tipo de la variable local \u0027value\u0027 de \u0027unsigned long\u0027 a \u0027int\u0027 para que SO_SETCLP coincida con su codificaci\u00f3n ABI sizeof(int) en sistemas de 64 bits."
          }
        ],
        "id": "CVE-2026-74689",
        "lastModified": "2026-10-14T13:10:00.187",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 7.1,
                "baseSeverity": "HIGH",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "NONE",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 1.8,
              "impactScore": 5.2,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-08-22T16:16:43.303",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2c5988c7349c0b64a7e0441bfc6e1dca54f7116a"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/35f258fee9ed358c6d0f57f91c30bf029c3724af"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/6eb6af88710977eb529b558a07294874d8c40c4d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/9f77c1ab382188f5b51982fab6d913443b6dc59f"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/b3bcd5d65ac03c15787b2a5b36c718e26a689336"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d0c80dbb970439bd2eeb0e5effff8c16a5f4e1e3"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-25T08:54:20+00:00",
      "cve": "CVE-2026-74689",
      "id": "CVE-2026-74689",
      "initial_release_date": "2026-08-22T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/atm: fix slab-out-of-bounds read in vcc_setsockopt()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74689.json",
      "version": "3"
    }
  }
}



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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

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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.
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  • 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.
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    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.