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CVE-2025-21680 – “QEMU Pktgen Array Out-of-Bounds Write Vulnerability”

The following table lists the changes that have been made to the
CVE-2025-21680 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jan. 31, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    pktgen: Avoid out-of-bounds access in get_imix_entries

    Passing a sufficient amount of imix entries leads to invalid access to the
    pkt_dev->imix_entries array because of the incorrect boundary check.

    UBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24
    index 20 is out of range for type ‘imix_pkt [20]’
    CPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 #121
    Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
    Call Trace:

    dump_stack_lvl lib/dump_stack.c:117
    __ubsan_handle_out_of_bounds lib/ubsan.c:429
    get_imix_entries net/core/pktgen.c:874
    pktgen_if_write net/core/pktgen.c:1063
    pde_write fs/proc/inode.c:334
    proc_reg_write fs/proc/inode.c:346
    vfs_write fs/read_write.c:593
    ksys_write fs/read_write.c:644
    do_syscall_64 arch/x86/entry/common.c:83
    entry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130

    Found by Linux Verification Center (linuxtesting.org) with SVACE.

    [ fp: allow to fill the array completely; minor changelog cleanup ]
    Added Reference https://git.kernel.org/stable/c/1a9b65c672ca9dc4ba52ca2fd54329db9580ce29
    Added Reference https://git.kernel.org/stable/c/3450092cc2d1c311c5ea92a2486daa2a33520ea5
    Added Reference https://git.kernel.org/stable/c/76201b5979768500bca362871db66d77cb4c225e
    Added Reference https://git.kernel.org/stable/c/7cde21f52042aa2e29a654458166b873d2ae66b3
    Added Reference https://git.kernel.org/stable/c/e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486
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