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    Home»Security»Common Vulnerabilities and Exposures (CVEs)»CVE-2024-58100 – Linux Kernel bpf Changes_pkt_data Property Vulnerability

    CVE-2024-58100 – Linux Kernel bpf Changes_pkt_data Property Vulnerability

    May 5, 2025

    CVE ID : CVE-2024-58100

    Published : May 5, 2025, 3:15 p.m. | 18 minutes ago

    Description : In the Linux kernel, the following vulnerability has been resolved:

    bpf: check changes_pkt_data property for extension programs

    When processing calls to global sub-programs, verifier decides whether
    to invalidate all packet pointers in current state depending on the
    changes_pkt_data property of the global sub-program.

    Because of this, an extension program replacing a global sub-program
    must be compatible with changes_pkt_data property of the sub-program
    being replaced.

    This commit:
    – adds changes_pkt_data flag to struct bpf_prog_aux:
    – this flag is set in check_cfg() for main sub-program;
    – in jit_subprogs() for other sub-programs;
    – modifies bpf_check_attach_btf_id() to check changes_pkt_data flag;
    – moves call to check_attach_btf_id() after the call to check_cfg(),
    because it needs changes_pkt_data flag to be set:

    bpf_check:
    … …
    – check_attach_btf_id resolve_pseudo_ldimm64
    resolve_pseudo_ldimm64 –> bpf_prog_is_offloaded
    bpf_prog_is_offloaded check_cfg
    check_cfg + check_attach_btf_id
    … …

    The following fields are set by check_attach_btf_id():
    – env->ops
    – prog->aux->attach_btf_trace
    – prog->aux->attach_func_name
    – prog->aux->attach_func_proto
    – prog->aux->dst_trampoline
    – prog->aux->mod
    – prog->aux->saved_dst_attach_type
    – prog->aux->saved_dst_prog_type
    – prog->expected_attach_type

    Neither of these fields are used by resolve_pseudo_ldimm64() or
    bpf_prog_offload_verifier_prep() (for netronome and netdevsim
    drivers), so the reordering is safe.

    Severity: 0.0 | NA

    Visit the link for more details, such as CVSS details, affected products, timeline, and more…

    Source: Read More

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    Previous ArticleCVE-2024-58237 – Linux Kernel BPF Packet Pointer Invalidation Vulnerability
    Next Article CVE-2024-58098 – Linux Kernel BPF Packet Pointer Invalidation Vulnerability

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