Bug 2516474 (CVE-2026-72319)

Summary: CVE-2026-72319 kernel: ipvs: ensure inner headers in ICMP errors are in headroom
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's IP Virtual Server (IPVS) component. This vulnerability occurs when the system processes Internet Control Message Protocol (ICMP) errors originating from network tunnels. Specifically, after stripping outer packet headers, the IPVS component fails to ensure that the inner IP headers are correctly positioned in the packet buffer's headroom. This improper handling of network packet headers could lead to incorrect packet processing, potentially resulting in a denial of service (DoS) or other forms of network instability.
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Description OSIDB Bzimport 2026-08-15 06:14:26 UTC 
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.
Comment 1 Keith Grant 2026-08-18 20:38:13 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081506-CVE-2026-72319-792e@gregkh/T