CVE-2026-43501 (GCVE-0-2026-43501)

Vulnerability from cvelistv5 – Published: 2026-05-21 12:17 – Updated: 2026-07-02 12:05
VLAI
Title
ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
  • CWE-131 - Incorrect Calculation of Buffer Size
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < bde199c72d319a4e207f88daabc888317504e2fb (git)
Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6e (git)
Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < 0a9e8053f1f8a8e1bfc1dd61ffe67be6c1180402 (git)
Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < 8e8be63465a5e80394c70324603dfea1bfdad48f (git)
Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < 4babc2d9fda2df43823b85d08a0180b68f1b0854 (git)
Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < c261d07a80576dc8ccf394ef8f074f8c67a06b37 (git)
Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < 7398ebefbfd4f8a31d4f665a4213302fa995494b (git)
Affected: 8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3 , < 9e6bf146b55999a095bb14f73a843942456d1adc (git)
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Linux Linux Affected: 5.7
Unaffected: 0 , < 5.7 (semver)
Unaffected: 5.10.258 , ≤ 5.10.* (semver)
Unaffected: 5.15.209 , ≤ 5.15.* (semver)
Unaffected: 6.1.175 , ≤ 6.1.* (semver)
Unaffected: 6.6.140 , ≤ 6.6.* (semver)
Unaffected: 6.12.86 , ≤ 6.12.* (semver)
Unaffected: 6.18.27 , ≤ 6.18.* (semver)
Unaffected: 7.0.4 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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Red Hat Red Hat Enterprise Linux AppStream EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux AppStream (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::appstream
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Red Hat Red Hat Enterprise Linux AppStream E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::appstream
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Red Hat Red Hat Enterprise Linux AppStream EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::appstream
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Red Hat Red Hat Enterprise Linux AppStream (v. 9)     cpe:/a:redhat:enterprise_linux:9::appstream
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux BaseOS (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.2)     cpe:/o:redhat:rhel_e4s:9.2::baseos
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Red Hat Red Hat Enterprise Linux BaseOS E4S (v.9.4)     cpe:/o:redhat:rhel_e4s:9.4::baseos
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Red Hat Red Hat Enterprise Linux BaseOS EUS (v.9.6)     cpe:/o:redhat:rhel_eus:9.6::baseos
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Red Hat Red Hat Enterprise Linux BaseOS (v. 9)     cpe:/o:redhat:enterprise_linux:9::baseos
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat CodeReady Linux Builder EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::crb
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Red Hat Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)     cpe:/a:redhat:enterprise_linux:9::crb
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux Real Time for NFV (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::nfv
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Red Hat Red Hat Enterprise Linux Real Time for NFV (v. 9)     cpe:/a:redhat:enterprise_linux:9::nfv
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Red Hat Red Hat Enterprise Linux Real Time EUS (v. 10.0)     cpe:/o:redhat:enterprise_linux_eus:10.0
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Red Hat Red Hat Enterprise Linux Real Time (v. 10)     cpe:/o:redhat:enterprise_linux:10.2
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Red Hat Red Hat Enterprise Linux Real Time E4S (v.9.2)     cpe:/a:redhat:rhel_e4s:9.2::realtime
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Red Hat Red Hat Enterprise Linux Real Time E4S (v.9.4)     cpe:/a:redhat:rhel_e4s:9.4::realtime
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Red Hat Red Hat Enterprise Linux Real Time EUS (v.9.6)     cpe:/a:redhat:rhel_eus:9.6::realtime
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Red Hat Red Hat Enterprise Linux Real Time (v. 9)     cpe:/a:redhat:enterprise_linux:9::realtime
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Red Hat Red Hat Enterprise Linux 9     cpe:/o:redhat:enterprise_linux:9
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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        "title": "kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows",
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            "value": "To mitigate this issue, disable IPv6 Source Routing by setting the `accept_source_route` sysctl parameter to 0 for all IPv6 interfaces. This can prevent the kernel from processing IPv6 Source Routing Headers, thereby avoiding the vulnerable code path.\n\nTo disable IPv6 Source Routing:\n`sysctl -w net.ipv6.conf.all.accept_source_route=0`\n`sysctl -w net.ipv6.conf.default.accept_source_route=0`\n\nTo make this change persistent across reboots, add the following lines to `/etc/sysctl.d/99-disable-ipv6-srh.conf`:\n`net.ipv6.conf.all.accept_source_route = 0`\n`net.ipv6.conf.default.accept_source_route = 0`\n\nThen, apply the changes with:\n`sysctl --system`\n\nDisabling IPv6 Source Routing may impact network configurations that rely on this feature."
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          "product": "Linux",
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
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      "providerMetadata": {
        "dateUpdated": "2026-06-14T17:45:41.875Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/bde199c72d319a4e207f88daabc888317504e2fb"
        },
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          "url": "https://git.kernel.org/stable/c/be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6e"
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        },
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          "url": "https://git.kernel.org/stable/c/8e8be63465a5e80394c70324603dfea1bfdad48f"
        },
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        },
        {
          "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",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-43501",
    "datePublished": "2026-05-21T12:17:49.885Z",
    "dateReserved": "2026-05-01T14:12:56.014Z",
    "dateUpdated": "2026-07-02T12:05:28.257Z",
    "state": "PUBLISHED"
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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/exthdrs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"bde199c72d319a4e207f88daabc888317504e2fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"be1fa0aa9b4fdd5a8b7a61ba520a690a68391e6e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"0a9e8053f1f8a8e1bfc1dd61ffe67be6c1180402\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"8e8be63465a5e80394c70324603dfea1bfdad48f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"4babc2d9fda2df43823b85d08a0180b68f1b0854\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"c261d07a80576dc8ccf394ef8f074f8c67a06b37\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"7398ebefbfd4f8a31d4f665a4213302fa995494b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"8610c7c6e3bd647ff98d21c8bc0580e77bc2f8b3\",\"lessThan\":\"9e6bf146b55999a095bb14f73a843942456d1adc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/exthdrs.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.7\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.7\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.258\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.209\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.175\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.140\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.86\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.27\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.4\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\",\"affectedData\":[{\"vendor\":\"Red 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  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.