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Linux Kernel CVE-2026-53246

| EUVDEUVD-2026-39197 CRITICAL
Out-of-bounds Write (CWE-787)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-48jv-x8c6-486c
Buffer Overflow Linux Memory Corruption Red Hat Suse
Critical
Disputed · 9.8 Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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Severity by source

Sources disagree (Medium–Critical)
Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
8.6 HIGH

Remote unauthenticated over SCTP so AV:N/AC:L/PR:N, but reliable impact is OOB read and crash (A:H), with corruption only 'potential' so C:L/I:L rather than H.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
8.6 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Red Hat
7.0 MEDIUM
qualitative

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

5
Analysis Generated
Jun 28, 2026 - 09:43 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
9.8 (CRITICAL)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 cve.org
CRITICAL 9.8

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing

When a listening SCTP server processes a COOKIE_ECHO chunk, the cached peer INIT chunk embedded after the cookie is parsed and its parameters are later walked by sctp_process_init() using sctp_walk_params().

However, the chunk header length of this cached INIT chunk was not validated against the remaining buffer in the COOKIE_ECHO payload. If the length field is inflated, the parameter walk can run beyond the actual received data, leading to out-of-bounds reads and potential memory corruption during later parameter handling (e.g. STATE_COOKIE processing and kmemdup() copies).

Add a bounds check in sctp_unpack_cookie() to ensure the cached INIT chunk length does not exceed the available data in the COOKIE_ECHO buffer before it is used.

AnalysisAI

Out-of-bounds memory access in the Linux kernel's SCTP stack lets a remote peer corrupt kernel memory by sending a COOKIE_ECHO chunk whose embedded cached INIT chunk advertises an inflated length, which sctp_unpack_cookie() failed to validate against the remaining COOKIE_ECHO buffer before sctp_process_init() walked its parameters. Any host running an SCTP listening server (kernels from 2.6.12 up to the fixed stable releases) is affected, with the kernel-assigned CVSS rating it 9.8/network-unauthenticated, though EPSS is low (0.17%, 7th percentile) and there is no public exploit identified at time of analysis. Impact ranges from out-of-bounds reads to potential heap corruption during STATE_COOKIE handling and kmemdup() copies.

Technical ContextAI

SCTP (Stream Control Transmission Protocol, RFC 4960) uses a stateless cookie handshake: a server echoes a signed STATE_COOKIE in the COOKIE_ECHO, and the peer's original INIT chunk is cached inside that cookie blob so the server can reconstruct association parameters without holding state. When the COOKIE_ECHO arrives, sctp_unpack_cookie() extracts that cached INIT chunk, and sctp_process_init() later iterates its TLV parameters with sctp_walk_params(). The bug is a classic missing length validation (CWE-130/CWE-20, manifesting as a CWE-125 out-of-bounds read, consistent with the 'Buffer Overflow' tag): the cached INIT chunk's header length field was trusted without checking it against the bytes actually present in the COOKIE_ECHO payload, so an inflated length drives the parameter walk past the received data. The fix adds a bounds check ensuring the cached INIT length does not exceed available buffer data.

RemediationAI

Vendor-released patch: upgrade to a fixed stable kernel - 6.18.36, 7.0.13, or 7.1 or later - or apply your distribution's backport of stable commits 0861615c28de, cc272185c9a9, or edccbf3d63b0 (https://git.kernel.org/stable/c/0861615c28de668669d748ef4eb913ea9262d13b and the two sibling commits). Where immediate patching is not possible, the most effective compensating control is to disable SCTP if unused: blacklist the module (e.g. 'install sctp /bin/true' in modprobe.d) which removes the attack surface entirely but breaks any SCTP-dependent service; if SCTP is required, restrict reachability of SCTP listening ports with firewall rules (nftables/iptables) so only trusted peers can send COOKIE_ECHO chunks, accepting that this does not help against trusted-but-malicious or spoofed on-path peers. There is no application-level configuration toggle that mitigates this within the SCTP handshake itself, so patching or module removal are the durable fixes.

Same weakness CWE-787 – Out-of-bounds Write

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Same technique Buffer Overflow

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CVE-2017-7269 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2015-3113 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2020-0796 CRITICAL POC
10.0
CVE-2019-11043 CRITICAL POC
9.8
CVE-2009-0927 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Important
Product Status
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

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CVE-2026-53246 vulnerability details – vuln.today
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