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Linux Kernel CVE-2026-72319

| EUVDEUVD-2026-59218 CRITICAL
2026-08-15 Linux GHSA-67vj-f5vq-78c5
Information Disclosure Linux Red Hat Suse
Critical
Disputed · 9.8 Vendor: Linux
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Severity by source

Sources disagree (Medium–Critical)
Vendor (Linux) PRIMARY
9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
6.5 MEDIUM

Network-delivered ICMP but requires non-default IPVS tunnel config and a crafted inner header (AC:H); unauthenticated (PR:N); impact is out-of-bounds read info leak (C:L) and kernel crash (A:H), not code execution.

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

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
Aug 17, 2026 - 08:25 vuln.today
CVSS changed
Aug 17, 2026 - 06:22 NVD
9.8 (CRITICAL)
Patch available
Aug 15, 2026 - 07:20 EUVD
CVE Published
Aug 15, 2026 - 05:55 cve.org
CRITICAL 9.8
CVE Published
Aug 15, 2026 - 05:55 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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

ipvs: ensure inner headers in ICMP errors are in headroom

Sashiko points out that after stripping the outer headers with pskb_pull() we should ensure the inner IP headers in ICMP errors from tunnels are present in the skb headroom for functions like ipv4_update_pmtu(), icmp_send() and IP_VS_DBG().

Also, add more checks for the length of the inner headers.

AnalysisAI

Improper handling of ICMP error packets in the Linux kernel's IPVS (IP Virtual Server) subsystem allows crafted ICMP errors from tunneled traffic to reference inner IP headers that are not guaranteed to reside in the skb headroom after pskb_pull() strips the outer headers, leading to out-of-bounds access in path-MTU update, icmp_send() and debug paths. The flaw affects hosts using IPVS load balancing with tunnel encapsulation; the practical consequence is an out-of-bounds read (information disclosure per source tags) or kernel crash rather than code execution. No public exploit identified at time of analysis, EPSS is low (0.22%, 13th percentile), and it is not listed in CISA KEV.

Technical ContextAI

The vulnerability lives in the IPVS (IP Virtual Server) code within the Linux kernel netfilter/load-balancing stack, specifically the handling of ICMP error messages associated with tunneled connections. When IPVS processes an ICMP error it uses pskb_pull() to remove the outer encapsulation headers so it can inspect the inner IP header of the packet that triggered the error. After that pull, the code did not verify that the inner headers were still linearly present in the skb headroom, nor did it fully validate the inner header length. Downstream helpers such as ipv4_update_pmtu(), icmp_send() and the IP_VS_DBG() debug macro then dereference those inner headers, reading memory that may lie outside the valid packet buffer. The root cause is a missing bounds/linearization check on network-supplied data (an out-of-bounds read class, akin to CWE-125), even though the feed reports CWE as N/A. The affected CPE is cpe:2.3:a:linux:linux, i.e. the mainline/stable kernel.

RemediationAI

Vendor-released patch: update to a fixed stable kernel - 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 7.1.5 (or mainline 7.2-rc3) or later on your branch - using the kernel.org stable commits (https://git.kernel.org/stable/c/19657b3a17b774ae4e2f2635b5ae8638c9344a40 and the related hashes), then reboot to load the patched kernel. Where immediate patching is not possible, reduce exposure by disabling IPVS tunnel (IPIP) mode and switching virtual services to direct-routing or NAT forwarding if the topology allows, or by unloading the IPVS modules on hosts that do not need load balancing (modprobe -r ip_vs and tunnel helpers) - note this disables load-balancing functionality and is only viable on non-director nodes. Additionally, filter or rate-limit inbound ICMP error messages to IPVS director hosts at the network edge to limit crafted-packet delivery, accepting that overly aggressive ICMP filtering can break legitimate path-MTU discovery. Treat the kernel patch as the durable fix rather than relying on these mitigations.

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Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

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CVE-2026-72319 vulnerability details – vuln.today
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