sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START (Linux Linux)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.45 % · percentile 39 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- Linux
- NVD status
- Analyzed
Description
In the Linux kernel, the following vulnerability has been resolved: sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START The SCTP_CMD_TIMER_START handler checks timer_pending() before calling timer_reduce(). The timer can expire and detach between these operations, causing timer_reduce() to rearm the timer without taking the association reference required for the newly armed timer. The timer callback later unconditionally drops its association reference, which can leave the association reference count unbalanced and result in use-after-free during association teardown. Use the return value of timer_reduce() to determine whether the timer was actually armed. Take the association reference only when timer_reduce() successfully starts a new timer, closing the race between checking the timer state and rearming it. This issue was reported by Nico Yip (@_cyeaa_) working with TrendAI Zero Day Initiative.
Weaknesses (CWE)
- CWE-362 — Concurrent Execution using Shared Resource with Improper Synchronization
References
- https://git.kernel.org/stable/c/cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c
- https://git.kernel.org/stable/c/3205a20f837f5b1f009427ac3d9f706bf8a6fbec
- https://git.kernel.org/stable/c/755d70ca845fd9b87c7b338ae6ae832b08cd0005
- https://git.kernel.org/stable/c/09e7f9290d63178f56095d5c18fb9f9470153db5
- https://git.kernel.org/stable/c/e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9
- https://git.kernel.org/stable/c/00b841bac10230c557be6b38efc48508198fe23e
- https://git.kernel.org/stable/c/3d698d1e6c8bc41e3e1707777a016f1bdd07842d
- https://git.kernel.org/stable/c/2188569e7e1b0bc3f3b557dc97ab7a02befc11c8
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | Linux |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H | NVD · 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (Secondary) |
European references
- ENISA EUVD · EUVD-2026-86961
- GCVE · GCVE-0-2026-98130
CERT-FR advisories
- CERTFR-2026-AVI-1432 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1375 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1289 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1253 — Multiples vulnérabilités dans le noyau Linux de Debian · cert.ssi.gouv.fr
Affected configurations (NVD CPE)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.19.126 < 4.20cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.4.44 < 5.5cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.6.16 < 5.7cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.7.1 < 5.10.271cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.11 < 5.15.222cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.16 < 6.1.189cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.2 < 6.6.158cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.111cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.53cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 7.2.7cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:5.7:rc7:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:*
Affected products
| Product | Versions |
|---|---|
| Linux · Linux | affected 20a785aa52c82246055a089e55df9dac47d67da1 < cbf2df9aac4202f9fb0b361a7fe8c79b29fad92c ; affected 20a785aa52c82246055a089e55df9dac47d67da1 < 3205a20f837f5b1f009427ac3d9f706bf8a6fbec ; affected 20a785aa52c82246055a089e55df9dac47d67da1 < 755d70ca845fd9b87c7b338ae6ae832b08cd0005 ; affected 20a785aa52c82246055a089e55df9dac47d67da1 < 09e7f9290d63178f56095d5c18fb9f9470153db5 ; affected 20a785aa52c82246055a089e55df9dac47d67da1 < e42ba56281ca3ae2dcb3558bebee9a1c9a4831d9 ; affected 20a785aa52c82246055a089e55df9dac47d67da1 < 00b841bac10230c557be6b38efc48508198fe23e |
| Linux · Linux | affected 5.7 ; unaffected 0 < 5.7 ; unaffected 5.10.271 ≤ 5.10.* ; unaffected 5.15.222 ≤ 5.15.* ; unaffected 6.1.189 ≤ 6.1.* ; unaffected 6.6.158 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |