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

Vulnerability from cvelistv5 – Published: 2025-05-05 14:53 – Updated: 2025-05-09 08:06
VLAI?
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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{
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          "product": "Linux",
          "programFiles": [
            "net/core/filter.c",
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          "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."
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        "dateUpdated": "2025-05-09T08:06:10.185Z",
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    "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"
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  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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Detection rules are retrieved from Rulezet.