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CVE-2025-40281 (GCVE-0-2025-40281)

Vulnerability from cvelistv5 – Published: 2025-12-06 21:51 – Updated: 2026-06-16 19:35
VLAI
Title
sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto
Summary
In the Linux kernel, the following vulnerability has been resolved: sctp: prevent possible shift-out-of-bounds in sctp_transport_update_rto syzbot reported a possible shift-out-of-bounds [1] Blamed commit added rto_alpha_max and rto_beta_max set to 1000. It is unclear if some sctp users are setting very large rto_alpha and/or rto_beta. In order to prevent user regression, perform the test at run time. Also add READ_ONCE() annotations as sysctl values can change under us. [1] UBSAN: shift-out-of-bounds in net/sctp/transport.c:509:41 shift exponent 64 is too large for 32-bit type 'unsigned int' CPU: 0 UID: 0 PID: 16704 Comm: syz.2.2320 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x16c/0x1f0 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:233 [inline] __ubsan_handle_shift_out_of_bounds+0x27f/0x420 lib/ubsan.c:494 sctp_transport_update_rto.cold+0x1c/0x34b net/sctp/transport.c:509 sctp_check_transmitted+0x11c4/0x1c30 net/sctp/outqueue.c:1502 sctp_outq_sack+0x4ef/0x1b20 net/sctp/outqueue.c:1338 sctp_cmd_process_sack net/sctp/sm_sideeffect.c:840 [inline] sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1372 [inline]
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:35 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < 0e0413e3315199b23ff4aec295e256034cd0a6e4 (git)
Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < 834e65be429c0fa4f9bb5945064bd57f18ed2187 (git)
Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < abb086b9a95d0ed3b757ee59964ba3c4e4b2fc1a (git)
Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < d0d858652834dcf531342c82a0428170aa7c2675 (git)
Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < ed71f801249d2350c77a73dca2c03918a15a62fe (git)
Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < 1cfa4eac275cc4875755c1303d48a4ddfe507ca8 (git)
Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < aaba523dd7b6106526c24b1fd9b5fc35e5aaa88d (git)
Affected: b58537a1f5629bdc98a8b9dc2051ce0e952f6b4b , < 1534ff77757e44bcc4b98d0196bc5c0052fce5fa (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.16
Unaffected: 0 , < 3.16 (semver)
Unaffected: 5.4.302 , ≤ 5.4.* (semver)
Unaffected: 5.10.247 , ≤ 5.10.* (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.59 , ≤ 6.12.* (semver)
Unaffected: 6.17.9 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Siemens RUGGEDCOM RST2428P Affected: 0 , < V4.0 (custom)
guessed Create a notification for this product.
Show details on NVD website
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        "lastModified": "2026-06-17T09:21:35.297",
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      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-40281.json",
      "version": "20"
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}



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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

Author Source Type Date Other

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.