{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63920",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63920"
  ],
  "published": "2026-07-19T14:56:29Z",
  "summary": "ipv6: validate extension header length before copying to cmsg",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: validate extension header length before copying to cmsg\n\nip6_datagram_recv_specific_ctl() builds IPV6_{HOPOPTS,DSTOPTS,RTHDR}\ncmsgs (and their IPV6_2292* legacy counterparts) by trusting the\non-wire hdrlen byte (ptr[1]) when computing the put_cmsg() length.\nThe length was validated only at parse time (ipv6_parse_hopopts(),\netc.).  An nftables payload-write expression can rewrite hdrlen after\nparsing and before the skb reaches recvmsg; the write itself is\nin-bounds but put_cmsg() then reads up to ((hdrlen+1) << 3) = 2040\nbytes from an 8-byte header.  nftables is reachable from an\nunprivileged user namespace, so this is an unprivileged\nslab-out-of-bounds read:\n\n  BUG: KASAN: slab-out-of-bounds in put_cmsg+0x3ac/0x540\n   put_cmsg+0x3ac/0x540\n   udpv6_recvmsg+0xca0/0x1250\n   sock_recvmsg+0xdf/0x190\n   ____sys_recvmsg+0x1b1/0x620\n\nAdd ipv6_get_exthdr_len() which validates that at least two bytes\nare accessible before reading the hdrlen field, then checks the\ncomputed length against skb_tail_pointer(skb), returning 0 on\nfailure.  Extension headers are kept in the linear skb area by\npskb_may_pull() during input, so skb_tail_pointer() is the correct\nbound.\n\nUse ipv6_get_exthdr_len() at all non-AH call sites: the five\nstandalone cmsg blocks (HbH, 2292HbH, 2292DSTOPTS x2, 2292RTHDR)\nand the three standard cases in the extension-header walk loop\n(DSTOPTS, ROUTING, default).  AH retains an inline bounds check\nbecause its length formula differs ((ptr[1]+2)<<2).\n\nThe walk loop also gets a pre-read bounds check at the top to\nvalidate ptr before any case accesses ptr[0] or ptr[1].\n\nWhen the walk loop detects a corrupted header, return from the\nfunction instead of continuing to process later socket options.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H"
    }
  ],
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      "cvss_v3_score": 7.1,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires local syscalls (nftables netlink to install a payload-set rule, setsockopt for IPV6_RECV* options, and recvmsg). Although the trigger packet is received over IPv6, the mandatory nftables corruption step is classified as Local per kernel guidance.\nAC:L - The attacker fully controls the nftables payload-set rule, the on-wire extension header, socket receive options, and the recvmsg call, making the slab out-of-bounds read reliably reproducible without races or external conditions.\nPR:L - An unprivileged local user can create a user+network namespace, obtain CAP_NET_ADMIN there, configure nftables, open a UDPv6/raw socket with extension-header cmsg options, and trigger the bug without real root in the initial namespace.\nUI:N - No victim interaction is required; the attacker can send the crafted IPv6 datagram and call recvmsg on their own socket to trigger the out-of-bounds read.\nS:U - Impact is confined to kernel memory disclosure and potential kernel instability within the same kernel security domain; it does not cross a VM/host or IOMMU boundary.\nC:H - put_cmsg() can copy up to 2040 bytes past the actual extension header into userspace ancillary data, leaking adjacent slab/kernel memory (confirmed by KASAN slab-out-of-bounds in put_cmsg).\nI:N - The bug is an out-of-bounds read that copies kernel data to userspace; it does not modify kernel memory, corrupt control structures, or provide a write primitive.\nA:H - The out-of-bounds slab read can provoke a KASAN fault/kernel oops during put_cmsg(), and repeated triggering can deny availability of the affected system."
    }
  }
}