FKIE_CVE-2026-53004

Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-06-24 17:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks sctp_getsockopt_peer_auth_chunks() checks that the caller's optval buffer is large enough for the peer AUTH chunk list with if (len < num_chunks) return -EINVAL; but then writes num_chunks bytes to p->gauth_chunks, which lives at offset offsetof(struct sctp_authchunks, gauth_chunks) == 8 inside optval. The check is missing the sizeof(struct sctp_authchunks) = 8-byte header. When the caller supplies len == num_chunks (for any num_chunks > 0) the test passes but copy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes past the declared buffer. The sibling function sctp_getsockopt_local_auth_chunks() at the next line already has the correct check: if (len < sizeof(struct sctp_authchunks) + num_chunks) return -EINVAL; Align the peer variant with its sibling. Reproducer confirms on v7.0-13-generic: an unprivileged userspace caller that opens a loopback SCTP association with AUTH enabled, queries num_chunks with a short optval, then issues the real getsockopt with len == num_chunks and sentinel bytes painted past the buffer observes those sentinel bytes overwritten with the peer's AUTH chunk type. The bytes written are under the peer's control but land in the caller's own userspace; this is not a kernel memory corruption, but it is a kernel-side contract violation that can silently corrupt adjacent userspace data.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0cf004ffb61cd32d140531c3a84afe975f9fc7ea
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2b5a2c957c7769d40110f725cf23987fcef50d75
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6849b995cda88a677bf08a05765d1db7905974fc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6bcf8fe4ef7967b22b814cbae9a57bbd3c853410
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/70a089cc9590aa347a61e84434116ab74619e3c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a132e199de69e2a45628aa8534df1bf5d44e1b6e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d45c7e99caf915b0f6c716bd8ffe9d45b9685761
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d67fbc6dea5dbf7f46c618ebf65910a276078e20
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a132e199de69e2a45628aa8534df1bf5d44e1b6e",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            },
            {
              "lessThan": "2b5a2c957c7769d40110f725cf23987fcef50d75",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            },
            {
              "lessThan": "d45c7e99caf915b0f6c716bd8ffe9d45b9685761",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            },
            {
              "lessThan": "d67fbc6dea5dbf7f46c618ebf65910a276078e20",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            },
            {
              "lessThan": "6849b995cda88a677bf08a05765d1db7905974fc",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            },
            {
              "lessThan": "70a089cc9590aa347a61e84434116ab74619e3c3",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            },
            {
              "lessThan": "6bcf8fe4ef7967b22b814cbae9a57bbd3c853410",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            },
            {
              "lessThan": "0cf004ffb61cd32d140531c3a84afe975f9fc7ea",
              "status": "affected",
              "version": "65b07e5d0d09c77e98050b5f0146ead29e5add32",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/sctp/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.24"
            },
            {
              "lessThan": "2.6.24",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.209",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.141",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.91",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.33",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: fix OOB write to userspace in sctp_getsockopt_peer_auth_chunks\n\nsctp_getsockopt_peer_auth_chunks() checks that the caller\u0027s optval\nbuffer is large enough for the peer AUTH chunk list with\n\n    if (len \u003c num_chunks)\n            return -EINVAL;\n\nbut then writes num_chunks bytes to p-\u003egauth_chunks, which lives\nat offset offsetof(struct sctp_authchunks, gauth_chunks) == 8\ninside optval.  The check is missing the sizeof(struct\nsctp_authchunks) = 8-byte header.  When the caller supplies\nlen == num_chunks (for any num_chunks \u003e 0) the test passes but\ncopy_to_user() writes sizeof(struct sctp_authchunks) = 8 bytes\npast the declared buffer.\n\nThe sibling function sctp_getsockopt_local_auth_chunks() at the\nnext line already has the correct check:\n\n    if (len \u003c sizeof(struct sctp_authchunks) + num_chunks)\n            return -EINVAL;\n\nAlign the peer variant with its sibling.\n\nReproducer confirms on v7.0-13-generic: an unprivileged userspace\ncaller that opens a loopback SCTP association with AUTH enabled,\nqueries num_chunks with a short optval, then issues the real\ngetsockopt with len == num_chunks and sentinel bytes painted past\nthe buffer observes those sentinel bytes overwritten with the\npeer\u0027s AUTH chunk type.  The bytes written are under the peer\u0027s\ncontrol but land in the caller\u0027s own userspace; this is not a\nkernel memory corruption, but it is a kernel-side contract\nviolation that can silently corrupt adjacent userspace data."
    }
  ],
  "id": "CVE-2026-53004",
  "lastModified": "2026-06-24T17:17:11.510",
  "metrics": {},
  "published": "2026-06-24T17:17:11.510",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0cf004ffb61cd32d140531c3a84afe975f9fc7ea"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2b5a2c957c7769d40110f725cf23987fcef50d75"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6849b995cda88a677bf08a05765d1db7905974fc"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6bcf8fe4ef7967b22b814cbae9a57bbd3c853410"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/70a089cc9590aa347a61e84434116ab74619e3c3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a132e199de69e2a45628aa8534df1bf5d44e1b6e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d45c7e99caf915b0f6c716bd8ffe9d45b9685761"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d67fbc6dea5dbf7f46c618ebf65910a276078e20"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}


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