ipvs: avoid out-of-bounds write in ip_vs_nat_icmp (CVE-2026-74724) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-74724

ipvs: avoid out-of-bounds write in ip_vs_nat_icmp

Answer in brief

CVE-2026-74724 records a Unknown severity vulnerability in ipvs: avoid out-of-bounds write in ip_vs_nat_icmp. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 22, 2026Updated Aug 22, 2026Source checked Aug 22, 2026First seen by HOL Aug 22, 2026Material review Aug 22, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3b8f79af0e98f27b932b0b416e9c52b692d31ff9 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c779b258c9c3c3567af68d4f45c2f751f35bd0e \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <be65fa324640c7a95e30b146159a2be5cc73f22e \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a69a4b3fff5814d079beff9a1e9d369994b2ed47 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <243d0187ec4c3837b9b0004f18d1068e46115760 \|\| >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <646922a0379496154e8c8faca4f8e2fd9100cacc	3b8f79af0e98f27b932b0b416e9c52b692d31ff9, 3c779b258c9c3c3567af68d4f45c2f751f35bd0e, be65fa324640c7a95e30b146159a2be5cc73f22e, a69a4b3fff5814d079beff9a1e9d369994b2ed47, 243d0187ec4c3837b9b0004f18d1068e46115760, 646922a0379496154e8c8faca4f8e2fd9100cacc
Linux/Linuxgeneric	2.6.12	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 3b8f79af0e98f27b932b0b416e9c52b692d31ff9 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 22, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 22, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ipvs: avoid out-of-bounds write in ip_vs_nat_icmp Sashiko warns that local attacker can modify the packet while it is processed by IPVS. Some places read the IP ihl field multiple times which can cause out-of-bounds access. One such place is ip_vs_nat_icmp where we can write after the validated area. Fix it by providing ciph argument just like it is done for IPv6 and use ciph->len as offset to the embedded transport header. Modify some IPv4 header checks by reading the ihl field only once.

Quoted source text, attributed separately from HOL analysis.