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ipv6: account for fraggap on the paged allocation path

Type: advisorySource: Official CVE ListKnown exploited1 source record

In the Linux kernel, the following vulnerability has been resolved: ipv6: account for fraggap on the paged allocation path In __ip6_append_data(), when the paged-allocation branch is taken (MSG_MORE / NETIF_F_SG / large fraglen), alloclen and pagedlen are computed as alloclen = fragheaderlen + transhdrlen; pagedlen = datalen - transhdrlen; datalen already includes fraggap (datalen = length + fraggap). When fraggap is non-zero, this is not the first skb and transhdrlen is zero. The fraggap bytes carried over from the previous skb are copied just past the fragment headers in the new skb's linear area. The linear area is therefore undersized by fraggap bytes while pagedlen is overstated by the same amount, and the copy writes past skb->end into the trailing skb_shared_info. An unprivileged user can trigger this via a UDPv6 socket using MSG_MORE together with MSG_SPLICE_PAGES. The bad accounting was introduced by commit 773ba4fe9104 ("ipv6: avoid partial copy for zc"). Before commit ce650a166335 ("udp6: Fix __ip6_append_data()'s handling of MSG_SPLICE_PAGES"), the negative copy value caused -EINVAL to be returned. That later commit allowed MSG_SPLICE_PAGES to proceed in this case, making the corruption triggerable. The non-paged branch sets alloclen to fraglen, which already accounts for fraggap because datalen does. Bring the paged branch in line by adding fraggap to alloclen and subtracting it from pagedlen. After this adjustment, copy no longer collapses to -fraggap on the pag

Announced Source revision 1
Original source ↗

CVE-2026-53362

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53362

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "773ba4fe9104a64a54d1c00f0fb6ffb95def2b03",
        "lessThan": "14200d435af9a9eeb444f529fc2f689a236b7962",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "773ba4fe9104a64a54d1c00f0fb6ffb95def2b03",
        "lessThan": "65fb14cbebb0cd0eff903a22d33537ddc8b95769",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "773ba4fe9104a64a54d1c00f0fb6ffb95def2b03",
        "lessThan": "46f201f8b4c39633a1fa3dc12459f506d470993d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "773ba4fe9104a64a54d1c00f0fb6ffb95def2b03",
        "lessThan": "6374fb9edf72c67a118a2c214a0dddd04c921e0a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "773ba4fe9104a64a54d1c00f0fb6ffb95def2b03",
        "lessThan": "e9eacf19281ea2498b36291b56c9606118c2d74e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "773ba4fe9104a64a54d1c00f0fb6ffb95def2b03",
        "lessThan": "736b380e28d0480c7bc3e022f1950f31fe53a7c5",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_output.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "6.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "6.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.1.177",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.144",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.95",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.38",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.3",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/ipv6/ip6_output.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53362

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-53362 · Unrated

Kernel · Known exploited (CISA KEV)

Event
#28454 · Revision 1
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