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CVE-2026-98547: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: af_packet: fix integer overflow in prb_calc_retire_blk_tmo() prb_calc_retire_blk_tmo() computes in 32-bit int arithmetic: mbits = (blk_size_in_bytes * 8) / (1024 * 1024); If I'm reading the validation right, tp_block_size is user controlled and packet_set_ring() only rejects values that are <= 0 as int or not page aligned, so a 256MiB block goes right through (and alloc_one_pg_vec_page() even has a vzalloc fallback for it). 0x10000000 * 8 wraps to INT_MIN, and on a NIC reporting 1 Gbps (div == 1) the function ends up returning -2047. The condition is actually (8 * size) mod 2^32 >= 2^31 && div == 1, so the trigger set is [256,512), [768,1024), [1280,1536) and [1792,2048) MiB. Other sizes wrap to non-negative values and faster links divide the unsigned value back below 2^31, which is why this doesn't blow up for everyone. What makes it fatal is what happens next in init_prb_bdqc(): p1->interval_ktime = ms_to_ktime(prb_calc_retire_blk_tmo(...)); hrtimer_start(&p1->retire_blk_timer, p1->interval_ktime, HRTIMER_MODE_REL_SOFT); A negative relative timeout expires immediately. The callback unconditionally returns HRTIMER_RESTART, and hrtimer_forward() turns the negative interval into hrtimer_resolution: if (interval < hrtimer_resolution) interval = hrtimer_resolution; So the SOFT timer re-fires at the maximum rate forever, holding sk_receive_queue.lock each pass. One CPU spins in softirq until the socket is closed. Repeat with more rings and the machine is gone. The overflow itself is ancient - it was introduced together with TPACKET_V3 in f6fb8f100b80 ("af-packet: TPACKET_V3 flexible buffer implementation."). Its effect prior to f7460d2989fa ("net: af_packet: Use hrtimer to do the retire operation", v6.18) was not as clear-cut, though: the return value was stored into an unsigned short retire_blk_tov, so a negative result wa

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    • Linux Linux: f6fb8f100b807378fda19e83e5ac6828b638603a преди 02afd75649a4e001031ed82153a5c39312ec0737; f6fb8f100b807378fda19e83e5ac6828b638603a преди eb5b3838b9200dac04bfe33483db0ee8287456fb; f6fb8f100b807378fda19e83e5ac6828b638603a преди 297acc571d5813db76b147c745b91031d5f9c960; f6fb8f100b807378fda19e83e5ac6828b638603a преди be1aacff399d519cc48d6b34354a54dd79041140; f6fb8f100b807378fda19e83e5ac6828b638603a преди b2bcc6a254d6f27823a56787668ae4ee8cdb6e71; f6fb8f100b807378fda19e83e5ac6828b638603a преди 6279211e7d2456ecd195d236c9ee5e5c6fa5a17a; f6fb8f100b807378fda19e83e5ac6828b638603a преди 218a944b9e035d4b47d59c69af6ca13319da15fb; f6fb8f100b807378fda19e83e5ac6828b638603a преди 56d82862a0a243ac14ba11b6d7b57ddc2d064b95
    • Linux Linux: 3.2; преди 3.2; 5.10.271 до 5.10.*; 5.15.222 до 5.15.*; 6.1.189 до 6.1.*; 6.6.158 до 6.6.*; 6.12.112 до 6.12.*; 6.18.55 до 6.18.*; 7.2.9 до 7.2.*; от 7.3 нататък

    История

    • 18 октомври 2026 Публикувано

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