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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: rpl: reserve mac_len headroom when recompressed SRH grows\n\nipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps\nthe next segment into ipv6_hdr-\u003edaddr, recompresses, then pulls the old\nheader and pushes the new one plus the IPv6 header back.  The\nrecompressed header can be larger than the received one when the swap\nreduces the common-prefix length the segments share with daddr (CmprI=0,\nCmprE\u003e0, seg[0][0] != daddr[0] gives the maximum +8 bytes).\n\npskb_expand_head() was gated on segments_left == 0, so on earlier\nsegments the push consumed unchecked headroom.  Once skb_push() leaves\nfewer than skb-\u003emac_len bytes in front of data,\nskb_mac_header_rebuild()\u0027s call to:\n\n\tskb_set_mac_header(skb, -skb-\u003emac_len);\n\nwill store (data - head) - mac_len into the u16 mac_header field, which\nwraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB\npast skb-\u003ehead.\n\nA single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two\nsegment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one\npass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv.\n\nFix this by expanding the head whenever the remaining room is less than\nthe push size plus mac_len, and request that much extra so the rebuilt\nMAC header fits afterwards."
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              "value": "AV:N - The bug is in the IPv6 receive path processing a routing extension header (RFC 6554 RPL SRH); a remote attacker triggers it by sending a crafted unicast IPv6 packet addressed to a host that processes RPL source routing, with no link-locality requirement in the code.\nAC:L - Triggering is deterministic \u2014 a single packet drains headroom over loopback, and the attacker fully controls header compression and segment count (forcing repeated looped_back passes) to drive headroom below mac_len; success does not depend on uncontrolled memory layout.\nPR:N - Processing happens automatically during inbound packet handling with no authentication or capability check; an unauthenticated network peer needs only to send a packet.\nUI:N - The kernel processes the malicious extension header automatically on receipt; no victim action is required.\nS:U - The out-of-bounds write corrupts kernel heap memory within the kernel\u0027s own security authority; no crossing of a VM/IOMMU/sandbox boundary occurs.\nC:H - The out-of-bounds heap write is a memory-corruption primitive that can corrupt adjacent length/pointer fields to enable subsequent kernel memory disclosure, warranting High under the corruption-could-leak-info guidance.\nI:H - This is a heap out-of-bounds write (~64 KiB past skb-\u003ehead), directly corrupting kernel memory \u2014 out-of-bounds writes are High integrity impact and can be groomed toward control-flow hijacking.\nA:H - Writing mac_len bytes far past the skb buffer corrupts unrelated kernel memory, reliably producing an oops/panic (confirmed by KASAN), a High availability impact."
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    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-08-05T12:28:24.185Z",
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