EUVD-2026-67452
GHSA-fq3m-cvqw-wrvh
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
C:H overstates a fixed 4-byte leak with no attacker content control; C:L is correct. All other metrics match the unauthenticated network INIT path.
Primary rating from Vendor (Linux).
CVSS VectorVendor: Linux
Lifecycle Timeline
5DescriptionCVE.org
In the Linux kernel, the following vulnerability has been resolved:
sctp: validate Adaptation Indication parameter length
The Adaptation Layer Indication parameter contains a fixed 32-bit Adaptation Code Point after its parameter header. However, sctp_verify_param() accepts a header-only parameter because the generic parameter walker only requires the header to be present.
sctp_process_param() then reads adaptation_ind beyond the declared parameter. When the malformed parameter is last in an INIT, the read starts at the receive skb tail, and the value is copied into the state cookie returned in the INIT ACK. This may disclose four receive-buffer tail bytes.
Require the declared parameter length to match the fixed structure size and abort the association through the existing invalid parameter length path otherwise.
AnalysisAI
Out-of-bounds read in the Linux kernel SCTP subsystem leaks up to four bytes of receive-buffer tail memory to remote unauthenticated attackers via a malformed INIT chunk. When an Adaptation Layer Indication parameter is sent with only its 4-byte header (omitting the mandatory 32-bit Adaptation Code Point), the kernel reads past the declared parameter boundary and copies those bytes into the state cookie of the INIT ACK response, exposing them to the peer. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the SCTP kernel module is loaded on the target system and that at least one SCTP socket is reachable by the attacker, or that the kernel's SCTP stack responds to INIT chunks at all - a peer can initiate an INIT to any port and still receive an INIT ACK even without a listening socket in some configurations. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The NVD CVSS 3.1 score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N) reflects zero-authentication, network-accessible exploitation, but the C:H rating is overstated relative to the actual impact: only four bytes of receive-buffer tail memory are disclosed per exploit attempt, with no attacker control over content. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | Upgrade to a patched Linux kernel stable release: 5.10.265 or later for the 5.10 LTS branch, 5.15.216 or later for 5.15 LTS, 6.1.183 or later for 6.1 LTS, 6.6.151 or later for 6.6 LTS, 6.12.103 or later for 6.12 LTS, 6.18.44 or later for 6.18, 7.1.8 or later for 7.1, or 7.2 and later for mainline. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, identify all systems running Linux with SCTP enabled and assess their exposure-common in network appliances, telecommunications stacks, and specialized services. …
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External POC / Exploit Code
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