Answer in brief
CVE-2026-98493 records a Unknown severity vulnerability in net: ipconfig: bound DHCP option construction. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), 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.
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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <abcba6f080c63e403037ecdffde43170d242376a || >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <24e79508b237dd2a69bc6fb6ac5cf7f126178307 || >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <cbaad2922bd5d4d303055ae9afecc8999e6b40c9 || >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <e47a1958e12abc3a17b5231a4f21c8f1bf662e08 | abcba6f080c63e403037ecdffde43170d242376a, 24e79508b237dd2a69bc6fb6ac5cf7f126178307, cbaad2922bd5d4d303055ae9afecc8999e6b40c9, e47a1958e12abc3a17b5231a4f21c8f1bf662e08 |
| Linux/Linuxgeneric | 2.6.36 | Not reported |
| Linux/Linuxgeneric | >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <38a6a118260ebfc82d0c653194d616bdfbd236ac || >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <abcba6f080c63e403037ecdffde43170d242376a || >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <24e79508b237dd2a69bc6fb6ac5cf7f126178307 || >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <cbaad2922bd5d4d303055ae9afecc8999e6b40c9 || >=130c0f47fdf9c533deb1136cad5136f6cb7020f0 <e47a1958e12abc3a17b5231a4f21c8f1bf662e08 | 38a6a118260ebfc82d0c653194d616bdfbd236ac, abcba6f080c63e403037ecdffde43170d242376a, 24e79508b237dd2a69bc6fb6ac5cf7f126178307, cbaad2922bd5d4d303055ae9afecc8999e6b40c9, e47a1958e12abc3a17b5231a4f21c8f1bf662e08 |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 18, 2026
In the Linux kernel, the following vulnerability has been resolved: net: ipconfig: bound DHCP option construction ic_dhcp_init_options() appends the hostname (option 12), vendor-class (option 60) and client-ID (option 61) options into the fixed 312-byte bootp_pkt.exten[] buffer. Only the client-ID branch checked the remaining space; the hostname and vendor-class writes were unbounded. A 64-byte hostname together with the maximum 252-byte dhcpclass= identifier needs 18 + (2 + 64) + (2 + 252) = 338 of the 312 available bytes even before the terminating END marker, so the vendor-class memcpy runs past the end of exten[]. With CONFIG_FORTIFY_SOURCE this is reported as a field-spanning write and, when the kernel is booted with panic_on_warn=1, aborts boot with a panic. Route the optional options through a common helper that makes sure the option, its 2-byte header and the END marker all fit and drops an option that would not. Configurations with short options keep sending exactly the same bytes as before.
Quoted source text, attributed separately from HOL analysis.