Answer in brief
CVE-2026-99064 records a High severity (CVSS 8.1) vulnerability in cipso: adjust cached option offsets when removing CIPSO. 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.
CVSS is 8.1. 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 | >=89aa3619d141d6cfb6040a561aebb6d99d3e2285 <b965977126a90e01825814c859ba4788691eddd3 || >=89aa3619d141d6cfb6040a561aebb6d99d3e2285 <2200fe1d6148b78e1b8f00f4b2bd47760015077f || >=89aa3619d141d6cfb6040a561aebb6d99d3e2285 <6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0 || >=89aa3619d141d6cfb6040a561aebb6d99d3e2285 <6d25ffca055a77787c21a36b66c253f76239411b | b965977126a90e01825814c859ba4788691eddd3, 2200fe1d6148b78e1b8f00f4b2bd47760015077f, 6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0, 6d25ffca055a77787c21a36b66c253f76239411b |
| Linux/Linuxgeneric | 6.10 | Not reported |
Published upstream
Oct 23, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 23, 2026
In the Linux kernel, the following vulnerability has been resolved: cipso: adjust cached option offsets when removing CIPSO cipso_v4_skbuff_delattr() removes the CIPSO bytes but does not adjust cached offsets for options that follow them. For example, with a valid 10-byte CIPSO option followed by a seven-byte RR option, parsing records rr at offset 30. Removing CIPSO moves RR to offset 20, while the cached offset remains 30. Consumers such as ip_forward_options() and __ip_options_echo() then access the wrong bytes; the latter may interpret packet data as the option length and copy it into fixed-size option storage. Mirror cipso_v4_delopt() and subtract cipso_len from the srr, rr, ts and router_alert offsets when they follow CIPSO. cipso_len is the distance the first memmove() shifts those options. The later header move and network-header reset relocate the bytes and their offset base together.
Quoted source text, attributed separately from HOL analysis.