Answer in brief
CVE-2026-98631 records a Unknown severity vulnerability in xsk: Use a 32-bit compare in xsk_map_gen_lookup. 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.
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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=e65650f291ee72fc578d6346080fc4699204ef2c <c6d5c582d55a8f229d75e98d62eaa065b0deb18d || >=e65650f291ee72fc578d6346080fc4699204ef2c <227ec890559e922e235eb543646e3bf0bd8269b0 || >=e65650f291ee72fc578d6346080fc4699204ef2c <11d9be35c1f4233798e99be98bc474f83a254c6c || >=e65650f291ee72fc578d6346080fc4699204ef2c <123f90f394ca404ab8796a7c8072ff7fa5b65a9c || >=e65650f291ee72fc578d6346080fc4699204ef2c <36461e58f88a1b723f86693f437ac12e60ff4363 || >=e65650f291ee72fc578d6346080fc4699204ef2c <b5c0cff0c5331582ab01c4c423731453a8381acc || >=e65650f291ee72fc578d6346080fc4699204ef2c <3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24 || >=e65650f291ee72fc578d6346080fc4699204ef2c <70504de0bb627848667207bec7ccfd647deb8814 | c6d5c582d55a8f229d75e98d62eaa065b0deb18d, 227ec890559e922e235eb543646e3bf0bd8269b0, 11d9be35c1f4233798e99be98bc474f83a254c6c, 123f90f394ca404ab8796a7c8072ff7fa5b65a9c, 36461e58f88a1b723f86693f437ac12e60ff4363, b5c0cff0c5331582ab01c4c423731453a8381acc, 3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24, 70504de0bb627848667207bec7ccfd647deb8814 |
| Linux/Linuxgeneric | 5.5 | Not reported |
Published upstream
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 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: xsk: Use a 32-bit compare in xsk_map_gen_lookup xsk_map_gen_lookup() loads a u32 key and compares it with max_entries using BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a max_entries value of 0x80000000 or higher becomes a threshold larger than every zero-extended 32-bit key. An out-of-range index then skips the bounds check and the generated lookup reads past xsk_map[]. Compare with BPF_JMP32_IMM so the check stays in 32-bit unsigned range.
Quoted source text, attributed separately from HOL analysis.