CVE-2024-58237 (GCVE-0-2024-58237)

Vulnerability from cvelistv5 – Published: 2025-05-05 14:53 – Updated: 2025-05-09 08:06
VLAI?
Title
bpf: consider that tail calls invalidate packet pointers
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf: consider that tail calls invalidate packet pointers Tail-called programs could execute any of the helpers that invalidate packet pointers. Hence, conservatively assume that each tail call invalidates packet pointers. Making the change in bpf_helper_changes_pkt_data() automatically makes use of check_cfg() logic that computes 'changes_pkt_data' effect for global sub-programs, such that the following program could be rejected: int tail_call(struct __sk_buff *sk) { bpf_tail_call_static(sk, &jmp_table, 0); return 0; } SEC("tc") int not_safe(struct __sk_buff *sk) { int *p = (void *)(long)sk->data; ... make p valid ... tail_call(sk); *p = 42; /* this is unsafe */ ... } The tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that can invalidate packet pointers. Otherwise, it can't be freplaced with tailcall_freplace.c:entry_freplace() that does a tail call.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 51c39bb1d5d105a02e29aa7960f0a395086e6342 , < f1692ee23dcaaddc24ba407b269707ee5df1301f (git)
Affected: 51c39bb1d5d105a02e29aa7960f0a395086e6342 , < 1c2244437f9ad3dd91215f920401a14f2542dbfc (git)
Affected: 51c39bb1d5d105a02e29aa7960f0a395086e6342 , < 1a4607ffba35bf2a630aab299e34dd3f6e658d70 (git)
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    Linux Linux Affected: 5.6
Unaffected: 0 , < 5.6 (semver)
Unaffected: 6.6.90 , ≤ 6.6.* (semver)
Unaffected: 6.12.9 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/core/filter.c",
            "tools/testing/selftests/bpf/progs/tc_bpf2bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f1692ee23dcaaddc24ba407b269707ee5df1301f",
              "status": "affected",
              "version": "51c39bb1d5d105a02e29aa7960f0a395086e6342",
              "versionType": "git"
            },
            {
              "lessThan": "1c2244437f9ad3dd91215f920401a14f2542dbfc",
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              "versionType": "git"
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            "tools/testing/selftests/bpf/progs/tc_bpf2bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.6"
            },
            {
              "lessThan": "5.6",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.90",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.90",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.12.9",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.13",
                  "versionStartIncluding": "5.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: consider that tail calls invalidate packet pointers\n\nTail-called programs could execute any of the helpers that invalidate\npacket pointers. Hence, conservatively assume that each tail call\ninvalidates packet pointers.\n\nMaking the change in bpf_helper_changes_pkt_data() automatically makes\nuse of check_cfg() logic that computes \u0027changes_pkt_data\u0027 effect for\nglobal sub-programs, such that the following program could be\nrejected:\n\n    int tail_call(struct __sk_buff *sk)\n    {\n    \tbpf_tail_call_static(sk, \u0026jmp_table, 0);\n    \treturn 0;\n    }\n\n    SEC(\"tc\")\n    int not_safe(struct __sk_buff *sk)\n    {\n    \tint *p = (void *)(long)sk-\u003edata;\n    \t... make p valid ...\n    \ttail_call(sk);\n    \t*p = 42; /* this is unsafe */\n    \t...\n    }\n\nThe tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that\ncan invalidate packet pointers. Otherwise, it can\u0027t be freplaced with\ntailcall_freplace.c:entry_freplace() that does a tail call."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-09T08:06:10.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f1692ee23dcaaddc24ba407b269707ee5df1301f"
        },
        {
          "url": "https://git.kernel.org/stable/c/1c2244437f9ad3dd91215f920401a14f2542dbfc"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a4607ffba35bf2a630aab299e34dd3f6e658d70"
        }
      ],
      "title": "bpf: consider that tail calls invalidate packet pointers",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-58237",
    "datePublished": "2025-05-05T14:53:34.153Z",
    "dateReserved": "2025-04-16T07:19:43.804Z",
    "dateUpdated": "2025-05-09T08:06:10.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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