CVE-2026-63912 (GCVE-0-2026-63912)
Vulnerability from cvelistv5
Published
2026-07-19 14:55
Modified
2026-10-19 20:17
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: xfrm: esp: restore combined single-frag length gate The ESP out-of-place fast path appends the trailer in esp_output_head() before esp_output_tail() allocates the destination page frag. The head-side gate currently checks skb->data_len and tailen separately, but the tail code allocates a single destination frag from the combined post-trailer skb->data_len. Reject the page-frag fast path when the combined aligned length exceeds a page. Otherwise skb_page_frag_refill() may fall back to a single page while the destination sg still spans the combined skb->data_len. Restore this combined-length page gate for both IPv4 and IPv6.
References
Impacted products
Vendor Product Version
Linux Linux Version: c075c3ea031757f8ea2d34567565b61a868c08d5
Version: a583f2f3c8788bffd7fd7baeb76bd6d80543d7ea
Version: 5bd8baab087dff657e05387aee802e70304cc813
Version: 5bd8baab087dff657e05387aee802e70304cc813
Version: 5bd8baab087dff657e05387aee802e70304cc813
Version: 5bd8baab087dff657e05387aee802e70304cc813
Version: 5bd8baab087dff657e05387aee802e70304cc813
Version: 5bd8baab087dff657e05387aee802e70304cc813
Version: 2c66b0c95bb0aa7652ba1eba293d0d5993b35a38
Version: ef6f83df1209a7d9bd1c605a62457d4c00f9179e
Version: 3defefd22ad5fbbe639b6157fb7e6311b2bf333d
Version: b657030870bb5351c5b1e84d4e9f186da6ca0496
Version: 5.10.113   ≤
Version: 5.15.36   ≤
Version: 4.14.288   ≤
Version: 4.19.252   ≤
Version: 5.4.205   ≤
Version: 5.17.5   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: esp: restore combined single-frag length gate\n\nThe ESP out-of-place fast path appends the trailer in esp_output_head()\nbefore esp_output_tail() allocates the destination page frag. The\nhead-side gate currently checks skb-\u003edata_len and tailen separately, but\nthe tail code allocates a single destination frag from the combined\npost-trailer skb-\u003edata_len.\n\nReject the page-frag fast path when the combined aligned length exceeds a\npage. Otherwise skb_page_frag_refill() may fall back to a single page while\nthe destination sg still spans the combined skb-\u003edata_len.\n\nRestore this combined-length page gate for both IPv4 and IPv6."
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      "title": "xfrm: esp: restore combined single-frag length gate",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63912",
    "datePublished": "2026-07-19T14:55:17.188Z",
    "dateReserved": "2026-07-19T07:54:57.020Z",
    "dateUpdated": "2026-10-19T20:17:55.311Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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A network peer can influence outbound skb fragment sizes to hit the vulnerable fast path without local shell access.\\nAC:L - An attacker can reliably craft payload sizes so ALIGN(skb-\u003edata_len) and ALIGN(tailen) each pass the broken per-field PAGE_SIZE gate while their combined aligned length exceeds PAGE_SIZE, repeatedly probing until the out-of-place page-frag path is taken.\\nPR:N - Exploitation does not require configuring xfrm or host admin rights; it only needs the target to already run ESP and the attacker to send traffic that is encrypted on output (e.g., as a remote VPN/site-to-site peer), which is network-layer access rather than local OS privilege.\\nUI:N - Triggering the vulnerable ESP output path requires only attacker-controlled network traffic and does not depend on any victim user action such as mounting a filesystem or opening a file.\\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security authority, not a 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\"affected\", \"version\": \"4.14.288\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"4.19.252\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.4.205\", \"lessThan\": \"5.5\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.17.5\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}], \"programFiles\": [\"net/ipv4/esp4.c\", \"net/ipv6/esp6.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.259\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.210\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.176\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.143\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.93\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.35\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0.12\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.0.*\"}, {\"status\": \"unaffected\", \"version\": \"7.1\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/ipv4/esp4.c\", \"net/ipv6/esp6.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/566295735530ee513326049b0540f32ec050bf2e\"}, {\"url\": \"https://git.kernel.org/stable/c/5d7ab86e2b6bc23054616bf6ac562013bf60af8c\"}, {\"url\": \"https://git.kernel.org/stable/c/36519e3d941fc99d3b52c134dbaf311f987a4708\"}, {\"url\": \"https://git.kernel.org/stable/c/322e48187e0245ab2fff6fec2220b0cae677dbec\"}, {\"url\": \"https://git.kernel.org/stable/c/b84091ceddc9f133229dceab3ccc930bf27f9cba\"}, {\"url\": \"https://git.kernel.org/stable/c/c093468aea8277f77272a4f199b2e15e19cabb59\"}, {\"url\": \"https://git.kernel.org/stable/c/65f3b3fc2347b89fe21db1e92c7681368415f095\"}, {\"url\": \"https://git.kernel.org/stable/c/dfa0d7b0ff1eb6b2c416b8fdb9b4f2cefba57a40\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm: esp: restore combined single-frag length gate\\n\\nThe ESP out-of-place fast path appends the trailer in esp_output_head()\\nbefore esp_output_tail() allocates the destination page frag. The\\nhead-side gate currently checks skb-\u003edata_len and tailen separately, but\\nthe tail code allocates a single destination frag from the combined\\npost-trailer skb-\u003edata_len.\\n\\nReject the page-frag fast path when the combined aligned length exceeds a\\npage. Otherwise skb_page_frag_refill() may fall back to a single page while\\nthe destination sg still spans the combined skb-\u003edata_len.\\n\\nRestore this combined-length page gate for both IPv4 and IPv6.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.259\", \"versionStartIncluding\": \"5.10.113\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.210\", \"versionStartIncluding\": \"5.15.36\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.176\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.143\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.93\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.35\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0.12\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.14.288\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"4.19.252\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.4.205\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.17.5\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:37:06.161Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-63912\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T20:17:55.311Z\", \"dateReserved\": \"2026-07-19T07:54:57.020Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-07-19T14:55:17.188Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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