sctp: fix a TOCTOU race in SCTP_CMD_TIMER_START
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- Partial Red Hat: 7 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 4.19.126 to before 4.20; 5.4.44 to before 5.5; 5.6.16 to before 5.7 | 4.20, 5.5, 5.7 | Patch available | CNA |
| Linux | Linux | 5.7 and later | 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3 | Patch available | CNA |
- Linux VendorLinux Affected 4.19.126 to before 4.20; 5.4.44 to before 5.5; 5.6.16 to before 5.7 Fixed in 4.20, 5.5, 5.7 Patch available CNA
- Linux VendorLinux Affected 5.7 and later Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 4.19.126 to before 4.20; 5.4.44 to before 5.5; 5.6.16 to before 5.7; 5.7.1 to before 5.10.271; 5.11 to before 5.15.222; 5.16 to before 6.1.189; 6.2 to before 6.6.158; 6.7 to before 6.12.111; 6.13 to before 6.18.53; 6.19 to before 7.2.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:* | 5.7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:5.7:rc7:*:*:*:*:*:* | 5.7 rc7 | Vulnerable | Linux |
| cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:* | 7.3 rc1 | Vulnerable | Linux |
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* Versions 4.19.126 to before 4.20; 5.4.44 to before 5.5; 5.6.16 to before 5.7; 5.7.1 to before 5.10.271; 5.11 to before 5.15.222; 5.16 to before 6.1.189; 6.2 to before 6.6.158; 6.7 to before 6.12.111; 6.13 to before 6.18.53; 6.19 to before 7.2.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.7:-:*:*:*:*:*:* Versions 5.7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:5.7:rc7:*:*:*:*:*:* Versions 5.7 rc7 Vulnerable ·Linux
- cpe:2.3:o:linux:linux_kernel:7.3:rc1:*:*:*:*:*:* Versions 7.3 rc1 Vulnerable ·Linux
Remediation
- Fix · CNA Linux (Linux) Fixed in 4.20, 5.5, 5.7
- Fix · CNA Linux (Linux) Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2.7, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet |
| Red Hat Enterprise Linux 8 | Affected | No fix yet |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-98130
- 2026-10-03 Alias added: GHSA-8fp7-88m9-24jc
- 2026-10-03 Fix available: Linux/Linux@09e7f9290d63178f56095d5c18fb9f9470153db5, Linux/Linux@3205a20f837f5b1f009427ac3d9f706bf8a6fbec, Linux/[email protected] +5 · CNA
- 2026-10-03 4 new references · CNA
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-10-23 Weakness changed · NVD
- 2026-10-30 Affected versions changed · Red Hat
References
Patch 8
- 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
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Sources
- CVE-2026-98130 · CVE Program
- CVE-2026-98130 · NVD
- FIRST EPSS
- GHSA-8fp7-88m9-24jc · GitHub Advisory Database · CC BY 4.0
- CVE-2026-98130 · Red Hat security data · CC BY 4.0
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