Vulnerability-Lookup

FKIE_CVE-2024-56694

Vulnerability from fkie_nvd - Published: 2024-12-28 10:15 - Updated: 2026-08-04 11:22

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: bpf: fix recursive lock when verdict program return SK_PASS When the stream_verdict program returns SK_PASS, it places the received skb into its own receive queue, but a recursive lock eventually occurs, leading to an operating system deadlock. This issue has been present since v6.9. ''' sk_psock_strp_data_ready write_lock_bh(&sk->sk_callback_lock) strp_data_ready strp_read_sock read_sock -> tcp_read_sock strp_recv cb.rcv_msg -> sk_psock_strp_read # now stream_verdict return SK_PASS without peer sock assign __SK_PASS = sk_psock_map_verd(SK_PASS, NULL) sk_psock_verdict_apply sk_psock_skb_ingress_self sk_psock_skb_ingress_enqueue sk_psock_data_ready read_lock_bh(&sk->sk_callback_lock) <= dead lock ''' This topic has been discussed before, but it has not been fixed. Previous discussion: https://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/01f1b88acfd79103da0610b45471f6c88ea98d72	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/221109ba2127eabd0aa64718543638b58b15df56
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/386efa339e08563dd33e83bc951aea5d407fe578	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/6694f7acd625ed854bf6342926e771d65dad7f69	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8ca2a1eeadf09862190b2810697702d803ceef2d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/da2bc8a0c8f3ac66fdf980fc59936f851a083561	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f84c5ef6ca23cc2f72f3b830d74f67944684bb05	Patch
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
af854a3a-2127-422b-91ae-364da2661108	https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/skmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "c0809c128dad4c3413818384eb06a341633db973",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "5965bc7535fb87510b724e5465ccc1a1cf00916d",
              "versionType": "git"
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              "status": "affected",
              "version": "39dc9e1442385d6e9be0b6491ee488dddd55ae27",
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              "lessThan": "da2bc8a0c8f3ac66fdf980fc59936f851a083561",
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              "version": "b397a0ab8582c533ec0c6b732392f141fc364f87",
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            {
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              "version": "6648e613226e18897231ab5e42ffc29e63fa3365",
              "versionType": "git"
            },
            {
              "lessThan": "f84c5ef6ca23cc2f72f3b830d74f67944684bb05",
              "status": "affected",
              "version": "6648e613226e18897231ab5e42ffc29e63fa3365",
              "versionType": "git"
            },
            {
              "lessThan": "8ca2a1eeadf09862190b2810697702d803ceef2d",
              "status": "affected",
              "version": "6648e613226e18897231ab5e42ffc29e63fa3365",
              "versionType": "git"
            },
            {
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              "version": "772d5729b5ff0df0d37b32db600ce635b2172f80",
              "versionType": "git"
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            {
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              "status": "affected",
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            },
            {
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              "status": "affected",
              "version": "5.15.159",
              "versionType": "semver"
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              "status": "affected",
              "version": "6.1.91",
              "versionType": "semver"
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              "version": "6.6.31",
              "versionType": "semver"
            },
            {
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              "status": "affected",
              "version": "6.8.10",
              "versionType": "semver"
            }
          ]
        },
        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
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              "status": "unaffected",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "5.10.233",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.15.174",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.64",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.11",
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            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.2",
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            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "CA30912E-AC28-4CAA-B0BF-82A5ABF6555D",
              "versionEndExcluding": "5.11",
              "versionStartIncluding": "5.10.223",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "AE68EECA-B500-4C8F-BA03-6297422D3BE3",
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            },
            {
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              "matchCriteriaId": "C14BE86F-46F8-45CE-942E-3CB49D3AAB95",
              "versionEndExcluding": "6.6.64",
              "versionStartIncluding": "6.6.31",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "DC02F628-9D7C-48E7-93BD-4A25BD2C74CF",
              "versionEndExcluding": "6.11.11",
              "versionStartIncluding": "6.8.10",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D8882B1B-2ABC-4838-AC1D-DBDBB5764776",
              "versionEndExcluding": "6.12.2",
              "versionStartIncluding": "6.12",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix recursive lock when verdict program return SK_PASS\n\nWhen the stream_verdict program returns SK_PASS, it places the received skb\ninto its own receive queue, but a recursive lock eventually occurs, leading\nto an operating system deadlock. This issue has been present since v6.9.\n\n\u0027\u0027\u0027\nsk_psock_strp_data_ready\n    write_lock_bh(\u0026sk-\u003esk_callback_lock)\n    strp_data_ready\n      strp_read_sock\n        read_sock -\u003e tcp_read_sock\n          strp_recv\n            cb.rcv_msg -\u003e sk_psock_strp_read\n              # now stream_verdict return SK_PASS without peer sock assign\n              __SK_PASS = sk_psock_map_verd(SK_PASS, NULL)\n              sk_psock_verdict_apply\n                sk_psock_skb_ingress_self\n                  sk_psock_skb_ingress_enqueue\n                    sk_psock_data_ready\n                      read_lock_bh(\u0026sk-\u003esk_callback_lock) \u003c= dead lock\n\n\u0027\u0027\u0027\n\nThis topic has been discussed before, but it has not been fixed.\nPrevious discussion:\nhttps://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf: se corrige el bloqueo recursivo cuando el programa de veredicto devuelve SK_PASS Cuando el programa stream_verdict devuelve SK_PASS, coloca el skb recibido en su propia cola de recepci\u00f3n, pero finalmente se produce un bloqueo recursivo que provoca un bloqueo del sistema operativo. Este problema ha estado presente desde la versi\u00f3n v6.9. \u0027\u0027\u0027 sk_psock_strp_data_ready write_lock_bh(\u0026amp;sk-\u0026gt;sk_callback_lock) strp_data_ready strp_read_sock read_sock -\u0026gt; tcp_read_sock strp_recv cb.rcv_msg -\u0026gt; sk_psock_strp_read # ahora stream_verdict devuelve SK_PASS sin asignaci\u00f3n de sock de pares __SK_PASS = sk_psock_map_verd(SK_PASS, NULL) sk_psock_verdict_apply sk_psock_skb_ingress_self sk_psock_skb_ingress_enqueue sk_psock_data_ready read_lock_bh(\u0026amp;sk-\u0026gt;sk_callback_lock) \u0026lt;= bloqueo muerto \u0027\u0027\u0027 Este tema se ha discutido antes, pero no se ha solucionado. Discusi\u00f3n anterior: https://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch"
    }
  ],
  "id": "CVE-2024-56694",
  "lastModified": "2026-08-04T11:22:22.090",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-12-28T10:15:15.203",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/01f1b88acfd79103da0610b45471f6c88ea98d72"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/221109ba2127eabd0aa64718543638b58b15df56"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/386efa339e08563dd33e83bc951aea5d407fe578"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/6694f7acd625ed854bf6342926e771d65dad7f69"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/8ca2a1eeadf09862190b2810697702d803ceef2d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/da2bc8a0c8f3ac66fdf980fc59936f851a083561"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/f84c5ef6ca23cc2f72f3b830d74f67944684bb05"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2024-56694 (GCVE-0-2024-56694)

Vulnerability from cvelistv5 – Published: 2024-12-28 09:46 – Updated: 2026-08-05 11:46

Title

bpf: fix recursive lock when verdict program return SK_PASS

Summary

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6653 records in the last 180 days details

References

9 references

URL	Tags
https://git.kernel.org/stable/c/221109ba2127eabd0…
https://git.kernel.org/stable/c/6694f7acd625ed854…
https://git.kernel.org/stable/c/386efa339e08563dd…
https://git.kernel.org/stable/c/da2bc8a0c8f3ac66f…
https://git.kernel.org/stable/c/01f1b88acfd79103d…
https://git.kernel.org/stable/c/f84c5ef6ca23cc2f7…
https://git.kernel.org/stable/c/8ca2a1eeadf098621…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: c0809c128dad4c3413818384eb06a341633db973 , < 221109ba2127eabd0aa64718543638b58b15df56 (git) Affected: 5965bc7535fb87510b724e5465ccc1a1cf00916d , < 6694f7acd625ed854bf6342926e771d65dad7f69 (git) Affected: 39dc9e1442385d6e9be0b6491ee488dddd55ae27 , < 386efa339e08563dd33e83bc951aea5d407fe578 (git) Affected: b397a0ab8582c533ec0c6b732392f141fc364f87 , < da2bc8a0c8f3ac66fdf980fc59936f851a083561 (git) Affected: 6648e613226e18897231ab5e42ffc29e63fa3365 , < 01f1b88acfd79103da0610b45471f6c88ea98d72 (git) Affected: 6648e613226e18897231ab5e42ffc29e63fa3365 , < f84c5ef6ca23cc2f72f3b830d74f67944684bb05 (git) Affected: 6648e613226e18897231ab5e42ffc29e63fa3365 , < 8ca2a1eeadf09862190b2810697702d803ceef2d (git) Affected: 772d5729b5ff0df0d37b32db600ce635b2172f80 (git) Affected: 5.10.223 , < 5.10.233 (semver) Affected: 5.15.159 , < 5.15.174 (semver) Affected: 6.1.91 , < 6.1.120 (semver) Affected: 6.6.31 , < 6.6.64 (semver) Affected: 6.8.10 , < 6.9 (semver)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 5.10.233 , ≤ 5.10.* (semver) Unaffected: 5.15.174 , ≤ 5.15.* (semver) Unaffected: 6.1.120 , ≤ 6.1.* (semver) Unaffected: 6.6.64 , ≤ 6.6.* (semver) Unaffected: 6.11.11 , ≤ 6.11.* (semver) Unaffected: 6.12.2 , ≤ 6.12.* (semver) Unaffected: 6.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-03T20:52:43.997Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/skmsg.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "221109ba2127eabd0aa64718543638b58b15df56",
              "status": "affected",
              "version": "c0809c128dad4c3413818384eb06a341633db973",
              "versionType": "git"
            },
            {
              "lessThan": "6694f7acd625ed854bf6342926e771d65dad7f69",
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              "versionType": "git"
            },
            {
              "lessThan": "386efa339e08563dd33e83bc951aea5d407fe578",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "da2bc8a0c8f3ac66fdf980fc59936f851a083561",
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              "versionType": "git"
            },
            {
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              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
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            {
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              "status": "affected",
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              "versionType": "semver"
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            {
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              "status": "affected",
              "version": "5.15.159",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.120",
              "status": "affected",
              "version": "6.1.91",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6.64",
              "status": "affected",
              "version": "6.6.31",
              "versionType": "semver"
            },
            {
              "lessThan": "6.9",
              "status": "affected",
              "version": "6.8.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/core/skmsg.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": "5.10.*",
              "status": "unaffected",
              "version": "5.10.233",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.174",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.120",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.64",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.11.*",
              "status": "unaffected",
              "version": "6.11.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.233",
                  "versionStartIncluding": "5.10.223",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.174",
                  "versionStartIncluding": "5.15.159",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.120",
                  "versionStartIncluding": "6.1.91",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.64",
                  "versionStartIncluding": "6.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.11.11",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.2",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "6.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.8.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: fix recursive lock when verdict program return SK_PASS\n\nWhen the stream_verdict program returns SK_PASS, it places the received skb\ninto its own receive queue, but a recursive lock eventually occurs, leading\nto an operating system deadlock. This issue has been present since v6.9.\n\n\u0027\u0027\u0027\nsk_psock_strp_data_ready\n    write_lock_bh(\u0026sk-\u003esk_callback_lock)\n    strp_data_ready\n      strp_read_sock\n        read_sock -\u003e tcp_read_sock\n          strp_recv\n            cb.rcv_msg -\u003e sk_psock_strp_read\n              # now stream_verdict return SK_PASS without peer sock assign\n              __SK_PASS = sk_psock_map_verd(SK_PASS, NULL)\n              sk_psock_verdict_apply\n                sk_psock_skb_ingress_self\n                  sk_psock_skb_ingress_enqueue\n                    sk_psock_data_ready\n                      read_lock_bh(\u0026sk-\u003esk_callback_lock) \u003c= dead lock\n\n\u0027\u0027\u0027\n\nThis topic has been discussed before, but it has not been fixed.\nPrevious discussion:\nhttps://lore.kernel.org/all/6684a5864ec86_403d20898@john.notmuch"
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The deadlock is triggered by inbound TCP data arriving on a sockmap-managed socket, driven from softirq packet-receive context (`tcp_data_queue` \u2192 `sk_data_ready` \u2192 `sk_psock_strp_data_ready`). On a host running a sockmap/sk_skb-accelerated proxy or load balancer, a remote peer sending a message that the verdict program passes is sufficient.\nAC:L - In an affected configuration the deadlock is deterministic \u2014 every `SK_PASS` return without a redirect peer re-enters `sk_callback_lock` \u2014 with no race to win, no memory-layout requirement, and no state the attacker cannot induce by simply sending data.\nPR:N - The remote peer needs no credentials on the target: the sockmap parser/verdict programs run on data as soon as it lands in the socket\u0027s receive path, before any application-level authentication, so an unauthenticated client connecting to the service triggers it.\nUI:N - No victim action is needed; sending data on an established TCP connection is enough, and the kernel processes it asynchronously in softirq.\nS:U - The hang is confined to the kernel of the affected host \u2014 the same security authority as the vulnerable component \u2014 with no crossing of a VM, IOMMU, or sandbox boundary.\nC:N - The flaw is recursive acquisition of an rwlock; no memory is read out of bounds, no object is used after free, and no kernel data is disclosed to the attacker.\nI:N - No memory corruption, no out-of-bounds or arbitrary write, and no control-flow influence \u2014 the only consequence is that the lock is never released.\nA:H - The CPU spins forever inside `read_lock_bh()` with softirqs and preemption disabled while holding `sk_callback_lock` for write, wedging that CPU (hard lockup / RCU stall) and blocking all other CPUs touching the socket \u2014 a full operating-system deadlock as described in the commit."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T11:46:08.180Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/221109ba2127eabd0aa64718543638b58b15df56"
        },
        {
          "url": "https://git.kernel.org/stable/c/6694f7acd625ed854bf6342926e771d65dad7f69"
        },
        {
          "url": "https://git.kernel.org/stable/c/386efa339e08563dd33e83bc951aea5d407fe578"
        },
        {
          "url": "https://git.kernel.org/stable/c/da2bc8a0c8f3ac66fdf980fc59936f851a083561"
        },
        {
          "url": "https://git.kernel.org/stable/c/01f1b88acfd79103da0610b45471f6c88ea98d72"
        },
        {
          "url": "https://git.kernel.org/stable/c/f84c5ef6ca23cc2f72f3b830d74f67944684bb05"
        },
        {
          "url": "https://git.kernel.org/stable/c/8ca2a1eeadf09862190b2810697702d803ceef2d"
        }
      ],
      "title": "bpf: fix recursive lock when verdict program return SK_PASS",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-56694",
    "datePublished": "2024-12-28T09:46:18.826Z",
    "dateReserved": "2024-12-27T15:00:39.849Z",
    "dateUpdated": "2026-08-05T11:46:08.180Z",
    "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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

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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.

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.

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