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FKIE_CVE-2026-72447

Vulnerability from fkie_nvd - Published: 2026-08-15 06:22 - Updated: 2026-08-17 06:19
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: hold socket lock when dumping endpoints in sctp_diag SCTP_DIAG endpoint dumping was traversing endpoint address lists without holding lock_sock(), while those lists could change concurrently via socket operations (e.g., bindx changes). This creates a race where nla_reserve() counts addresses under RCU protection, but the subsequent copy may see fewer entries, potentially leaking uninitialized memory to userspace. Fix this by: - Taking a reference on each endpoint during hash traversal - Moving socket operations (lock_sock()) outside read_lock_bh() - Serializing address list access during dump - Reworking sctp_for_each_endpoint() to support restart-based traversal with (net, pos) tracking Also: - Add WARN_ON_ONCE() for inconsistent address counts - Fix idiag_states filtering for LISTEN vs association cases - Skip dumping endpoints being freed (ep->base.dead) - Move dump position tracking into iterator, removing cb->args[4] and its comment for sctp_ep_dump()., - Update the comment for cb->args[4] and remove the comment for unused cb->args[5] for sctp_sock_dump(). Note: traversal is restart-based and may re-scan buckets multiple times, but this is acceptable due to small bucket sizes and required to support sleeping-safe callbacks. This issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero Day Initiative.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/207bb4ce8fe7de961ae7bb33569ad2cd61f44954
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/722576aba0a6d9423714550b1c03239b0f0def77
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/abe7f8828e6ac8be858870c2bf836258844f97d5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ec3c2d59a192e17e1014ba71afc368ba162ecac3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f09a245f33e567b604efa1960b7a2d25dd9c8713
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f98c294a9369b6fe89e652c06357ee594be4dfa2
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/net/sctp/sctp.h",
            "net/sctp/diag.c",
            "net/sctp/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f98c294a9369b6fe89e652c06357ee594be4dfa2",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            },
            {
              "lessThan": "8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            },
            {
              "lessThan": "ec3c2d59a192e17e1014ba71afc368ba162ecac3",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            },
            {
              "lessThan": "722576aba0a6d9423714550b1c03239b0f0def77",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            },
            {
              "lessThan": "abe7f8828e6ac8be858870c2bf836258844f97d5",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            },
            {
              "lessThan": "207bb4ce8fe7de961ae7bb33569ad2cd61f44954",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            },
            {
              "lessThan": "f09a245f33e567b604efa1960b7a2d25dd9c8713",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            },
            {
              "lessThan": "7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823",
              "status": "affected",
              "version": "8f840e47f190cbe61a96945c13e9551048d42cef",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/net/sctp/sctp.h",
            "net/sctp/diag.c",
            "net/sctp/socket.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.7"
            },
            {
              "lessThan": "4.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "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: hold socket lock when dumping endpoints in sctp_diag\n\nSCTP_DIAG endpoint dumping was traversing endpoint address lists without\nholding lock_sock(), while those lists could change concurrently via\nsocket operations (e.g., bindx changes). This creates a race where\nnla_reserve() counts addresses under RCU protection, but the subsequent\ncopy may see fewer entries, potentially leaking uninitialized memory to\nuserspace.\n\nFix this by:\n\n- Taking a reference on each endpoint during hash traversal\n- Moving socket operations (lock_sock()) outside read_lock_bh()\n- Serializing address list access during dump\n- Reworking sctp_for_each_endpoint() to support restart-based traversal\n  with (net, pos) tracking\n\nAlso:\n\n- Add WARN_ON_ONCE() for inconsistent address counts\n- Fix idiag_states filtering for LISTEN vs association cases\n- Skip dumping endpoints being freed (ep-\u003ebase.dead)\n- Move dump position tracking into iterator, removing cb-\u003eargs[4] and\n  its comment for sctp_ep_dump().,\n- Update the comment for cb-\u003eargs[4] and remove the comment for unused\n  cb-\u003eargs[5] for sctp_sock_dump().\n\nNote: traversal is restart-based and may re-scan buckets multiple times,\nbut this is acceptable due to small bucket sizes and required to support\nsleeping-safe callbacks.\n\nThis issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero\nDay Initiative."
    }
  ],
  "id": "CVE-2026-72447",
  "lastModified": "2026-08-17T06:19:12.170",
  "metrics": {},
  "published": "2026-08-15T06:22:18.600",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/207bb4ce8fe7de961ae7bb33569ad2cd61f44954"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/722576aba0a6d9423714550b1c03239b0f0def77"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/abe7f8828e6ac8be858870c2bf836258844f97d5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ec3c2d59a192e17e1014ba71afc368ba162ecac3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f09a245f33e567b604efa1960b7a2d25dd9c8713"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f98c294a9369b6fe89e652c06357ee594be4dfa2"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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