EUVD-2026-38840
GHSA-9qr8-jp95-w4m5
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Local unprivileged user can reach AF_ALG (AV:L, PR:L); reliably triggering and shaping the integer-overflow corruption is non-trivial (AC:H); kernel memory corruption yields full C/I/A impact.
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Lifecycle Timeline
7DescriptionNVD
In the Linux kernel, the following vulnerability has been resolved:
crypto: af_alg - Cap AEAD AD length to 0x80000000
In order to prevent arithmetic overflows when checking the TX buffer size, cap the associated data length to 0x80000000.
AnalysisAI
Integer overflow in the Linux kernel's AF_ALG socket interface (crypto/af_alg.c) lets a local user supply an oversized AEAD associated-data length that wraps during TX buffer size arithmetic, corrupting size checks; the fix caps AD length to 0x80000000. Carrying CVSS 7.0 (AV:L/AC:H/PR:L), it affects any kernel exposing the algif AEAD interface and threatens confidentiality, integrity, and availability through resulting memory corruption. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires local code execution as an unprivileged user (PR:L) on a kernel where the AF_ALG socket family and the algif_aead module are available and reachable - the attacker must be able to open an AF_ALG socket and issue an AEAD request with an attacker-controlled associated-data length. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Signals are internally consistent and point to a real-but-not-urgent local issue rather than a mass-exploitation threat. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | A local low-privileged user (or a process inside a container with AF_ALG access) opens an algif_aead socket and submits an AEAD operation declaring a crafted, oversized associated-data length that overflows the kernel's TX buffer size computation, defeating the bounds check and corrupting kernel memory. Given high attack complexity, the attacker would chain this into a controlled heap/memory corruption primitive aiming at local privilege escalation or a kernel crash (DoS). … |
| Remediation | Vendor-released patch: upgrade to a fixed stable kernel - 5.10.258, 5.15.209, 6.1.175, 6.6.141, 6.12.91, 6.18.33, or 7.0.10 (or later in your series), or apply the upstream stable commits listed at git.kernel.org (e.g. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: identify Linux systems with AF_ALG AEAD interface enabled via kernel configuration audit. …
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Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Integer Overflow
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External POC / Exploit Code
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