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CVE-2026-72447 (GCVE-0-2026-72447)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:56 – Updated: 2026-08-17 05:14
VLAI
Title
sctp: hold socket lock when dumping endpoints in sctp_diag
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < f98c294a9369b6fe89e652c06357ee594be4dfa2 (git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 8b38e3dcfde3077dbc03eb8ef88e03cc19f70b8a (git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < ec3c2d59a192e17e1014ba71afc368ba162ecac3 (git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 722576aba0a6d9423714550b1c03239b0f0def77 (git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < abe7f8828e6ac8be858870c2bf836258844f97d5 (git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 207bb4ce8fe7de961ae7bb33569ad2cd61f44954 (git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < f09a245f33e567b604efa1960b7a2d25dd9c8713 (git)
Affected: 8f840e47f190cbe61a96945c13e9551048d42cef , < 7d8297e26b4e20b5d1c3c3fe51fe81a1c7fbc823 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.7
Unaffected: 0 , < 4.7 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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    "dateReserved": "2026-08-09T03:40:39.931Z",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-19T17:46:16+00:00",
      "cve": "CVE-2026-72447",
      "id": "CVE-2026-72447",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: sctp: hold socket lock when dumping endpoints in sctp_diag",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72447.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.