CVE-2026-43501 (GCVE-0-2026-43501)
Vulnerability from cvelistv5
Published
2026-05-21 12:17
Modified
2026-08-05 12:28
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows ipv6_rpl_srh_rcv() decompresses an RFC 6554 Source Routing Header, swaps the next segment into ipv6_hdr->daddr, recompresses, then pulls the old header and pushes the new one plus the IPv6 header back. The recompressed header can be larger than the received one when the swap reduces the common-prefix length the segments share with daddr (CmprI=0, CmprE>0, seg[0][0] != daddr[0] gives the maximum +8 bytes). pskb_expand_head() was gated on segments_left == 0, so on earlier segments the push consumed unchecked headroom. Once skb_push() leaves fewer than skb->mac_len bytes in front of data, skb_mac_header_rebuild()'s call to: skb_set_mac_header(skb, -skb->mac_len); will store (data - head) - mac_len into the u16 mac_header field, which wraps to ~65530, and the following memmove() writes mac_len bytes ~64KiB past skb->head. A single AF_INET6/SOCK_RAW/IPV6_HDRINCL packet over lo with a two segment type-3 SRH (CmprI=0, CmprE=15) reaches headroom 8 after one pass; KASAN reports a 14-byte OOB write in ipv6_rthdr_rcv. Fix this by expanding the head whenever the remaining room is less than the push size plus mac_len, and request that much extra so the rebuilt MAC header fits afterwards.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
Version: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3
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          "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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            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:28:24.185Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/bde199c72d319a4e207f88daabc888317504e2fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6e"
        },
        {
          "url": "https://git.kernel.org/stable/c/0a9e8053f1f8a8e1bfc1dd61ffe67be6c1180402"
        },
        {
          "url": "https://git.kernel.org/stable/c/8e8be63465a5e80394c70324603dfea1bfdad48f"
        },
        {
          "url": "https://git.kernel.org/stable/c/4babc2d9fda2df43823b85d08a0180b68f1b0854"
        },
        {
          "url": "https://git.kernel.org/stable/c/c261d07a80576dc8ccf394ef8f074f8c67a06b37"
        },
        {
          "url": "https://git.kernel.org/stable/c/7398ebefbfd4f8a31d4f665a4213302fa995494b"
        },
        {
          "url": "https://git.kernel.org/stable/c/9e6bf146b55999a095bb14f73a843942456d1adc"
        }
      ],
      "title": "ipv6: rpl: reserve mac_len headroom when recompressed SRH grows",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43501",
    "datePublished": "2026-05-21T12:17:49.885Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-08-05T12:28:24.185Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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