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    Home»Security»Common Vulnerabilities and Exposures (CVEs)»CVE-2025-38339 – Linux Kernel PowerPC BPF Trampoline JIT Code Size Calculation Vulnerability

    CVE-2025-38339 – Linux Kernel PowerPC BPF Trampoline JIT Code Size Calculation Vulnerability

    July 10, 2025

    CVE ID : CVE-2025-38339

    Published : July 10, 2025, 9:15 a.m. | 4 hours, 51 minutes ago

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

    powerpc/bpf: fix JIT code size calculation of bpf trampoline

    arch_bpf_trampoline_size() provides JIT size of the BPF trampoline
    before the buffer for JIT’ing it is allocated. The total number of
    instructions emitted for BPF trampoline JIT code depends on where
    the final image is located. So, the size arrived at with the dummy
    pass in arch_bpf_trampoline_size() can vary from the actual size
    needed in arch_prepare_bpf_trampoline(). When the instructions
    accounted in arch_bpf_trampoline_size() is less than the number of
    instructions emitted during the actual JIT compile of the trampoline,
    the below warning is produced:

    WARNING: CPU: 8 PID: 204190 at arch/powerpc/net/bpf_jit_comp.c:981 __arch_prepare_bpf_trampoline.isra.0+0xd2c/0xdcc

    which is:

    /* Make sure the trampoline generation logic doesn’t overflow */
    if (image && WARN_ON_ONCE(&image[ctx->idx] >
    (u32 *)rw_image_end – BPF_INSN_SAFETY)) {

    So, during the dummy pass, instead of providing some arbitrary image
    location, account for maximum possible instructions if and when there
    is a dependency with image location for JIT’ing.

    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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