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CVE-2026-99033: Linux

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Оригинално описание

    In the Linux kernel, the following vulnerability has been resolved: net/packet: guard the ll header push in packet_rcv_spkt() packet_rcv_spkt() restores the link layer header with skb_push(skb, skb->data - skb_mac_header(skb)); That subtraction is only meaningful when the device actually has a link layer header. packet_rcv() and tpacket_rcv() both wrap it in dev_has_header(), which is also the predicate the block comment at the top of the file states the restore in terms of; packet_rcv_spkt() does not. commit d549699048b4 ("net/packet: fix packet receive on L3 devices without visible hard header") introduced the helper and changed the two call sites, and this one stayed behind. A device without a visible ll header can leave skb->mac_header at the 0xFFFF sentinel that __alloc_skb() initialises it to. A CAN skb does: init_can_skb() sets pkt_type and ip_summed but does not reset the headers, and commit 9f10374bb024 ("can: remove private CAN skb headroom infrastructure") dropped the skb_reset_*_header() calls that used to be there. skb_mac_header() is then 0xFFFF, the length becomes a large negative number and skb_push() reports it through skb_under_panic() -- from softirq context, so it is a full system panic even with panic_on_oops=0: skbuff: skb_under_panic: text:ffffffff8bd21bc1 len:-65455 put:-65471 head:... data:... tail:0x50 end:0x180 dev:can0 kernel BUG at net/core/skbuff.c:214! RIP: 0010:skb_panic+0x50/0x60 Call Trace: <IRQ> skb_push+0x38/0x40 packet_rcv_spkt+0xe1/0x170 __netif_receive_skb_core.constprop.0+0x7e8/0xd30 ... Kernel panic - not syncing: Fatal exception in interrupt The socket type is reachable: packet_create() accepts SOCK_PACKET alongside SOCK_RAW and SOCK_DGRAM behind the same CAP_NET_RAW check, and neither the socket length nor a capability check keeps it away from a CAN interface. The missing skb_reset_*_header() calls in init_can_skb() are a regression in their own right and are being fixed separately, but

    Засегнати продукти

    • Linux Linux: d549699048b4b5c22dd710455bcdb76966e55aa3 преди 48aa1155fa8d83362fc33d02d527a3c3fe40ce1c; d549699048b4b5c22dd710455bcdb76966e55aa3 преди 7f84ed94ccfe36091234a2891b88356dc06e6d66; d549699048b4b5c22dd710455bcdb76966e55aa3 преди b880df0e487caa85c3c7ffda37dcd05334b1aa80; d549699048b4b5c22dd710455bcdb76966e55aa3 преди d8a24b9e1774a93943caf68d48c5e17be432220b; d549699048b4b5c22dd710455bcdb76966e55aa3 преди 31c7b15b3716e8d0dad58d2c3cdf321dfd06f4be; d549699048b4b5c22dd710455bcdb76966e55aa3 преди 3efe0e0944157fdd2072b4dc7eb0491a317ed272; d549699048b4b5c22dd710455bcdb76966e55aa3 преди 00fbf71e74115f7628fc0880b855434b1e70c40c; d549699048b4b5c22dd710455bcdb76966e55aa3 преди 28bc1ef699610ee09ce3d46a00552f5a0a0144bd; dadddde259a19105ee69e788835f4d4552767aa9; 5.9.13 преди 5.10
    • Linux Linux: 5.10; преди 5.10; 5.10.273 до 5.10.*; 5.15.224 до 5.15.*; 6.1.191 до 6.1.*; 6.6.160 до 6.6.*; 6.12.113 до 6.12.*; 6.18.57 до 6.18.*; 7.2.11 до 7.2.*; от 7.3 нататък

    История

    • 23 октомври 2026 Публикувано

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    CVE-2026-99033: Linux | freedomonline.bg