CVE-2026-53362 (GCVE-0-2026-53362)

Vulnerability from cvelistv5 – Published: 2026-07-04 11:56 – Updated: 2026-07-18 07:33
VLAI
Title
ipv6: account for fraggap on the paged allocation path
Summary
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 paged path, so remove the stale comment describing that old arithmetic. Since a negative copy is no longer expected for a valid MSG_SPLICE_PAGES case, remove the MSG_SPLICE_PAGES exception from the negative copy check.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 , < 14200d435af9a9eeb444f529fc2f689a236b7962 (git)
Affected: 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 , < 65fb14cbebb0cd0eff903a22d33537ddc8b95769 (git)
Affected: 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 , < 46f201f8b4c39633a1fa3dc12459f506d470993d (git)
Affected: 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 , < 6374fb9edf72c67a118a2c214a0dddd04c921e0a (git)
Affected: 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 , < e9eacf19281ea2498b36291b56c9606118c2d74e (git)
Affected: 773ba4fe9104a64a54d1c00f0fb6ffb95def2b03 , < 736b380e28d0480c7bc3e022f1950f31fe53a7c5 (git)
Create a notification for this product.
Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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The linear area is\\ntherefore undersized by fraggap bytes while pagedlen is overstated by the\\nsame amount, and the copy writes past skb-\u003eend into the trailing\\nskb_shared_info.\\n\\nAn unprivileged user can trigger this via a UDPv6 socket using\\nMSG_MORE together with MSG_SPLICE_PAGES.\\n\\nThe bad accounting was introduced by commit 773ba4fe9104 (\\\"ipv6:\\navoid partial copy for zc\\\"). Before commit ce650a166335 (\\\"udp6: Fix\\n__ip6_append_data()\u0027s handling of MSG_SPLICE_PAGES\\\"), the negative\\ncopy value caused -EINVAL to be returned. That later commit allowed\\nMSG_SPLICE_PAGES to proceed in this case, making the corruption\\ntriggerable.\\n\\nThe non-paged branch sets alloclen to fraglen, which already accounts\\nfor fraggap because datalen does. Bring the paged branch in line by\\nadding fraggap to alloclen and subtracting it from pagedlen.\\n\\nAfter this adjustment, copy no longer collapses to -fraggap on the\\npaged path, so remove the stale comment describing that old arithmetic.\\nSince a negative copy is no longer expected for a valid MSG_SPLICE_PAGES\\ncase, remove the MSG_SPLICE_PAGES exception from the negative copy 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    "redhat_vex": {
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      "current_release_date": "2026-07-22T21:41:18+00:00",
      "cve": "CVE-2026-53362",
      "id": "CVE-2026-53362",
      "initial_release_date": "2026-06-21T00:00:00+00:00",
      "product_status:fixed": "669",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: kernel: ipv6 frag escape",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53362.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-21T23:48:56Z",
      "cve": "CVE-2026-53362",
      "id": "CVE-2026-53362",
      "initial_release_date": "2026-07-05T01:58:40Z",
      "product_status:first_fixed": "127",
      "product_status:known_affected": "29",
      "product_status:known_not_affected": "179",
      "product_status:recommended": "275",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-53362",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-53362.json",
      "version": "12"
    }
  }
}



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