cipso: adjust cached option offsets when removing CIPSO
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.
CVE-2026-99064
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-99064
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
"lessThan": "b965977126a90e01825814c859ba4788691eddd3",
"versionType": "git"
},
{
"status": "affected",
"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
"lessThan": "2200fe1d6148b78e1b8f00f4b2bd47760015077f",
"versionType": "git"
},
{
"status": "affected",
"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
"lessThan": "6e49d611a9cfbaac927b8fa80ebd4f6b1f37ada0",
"versionType": "git"
},
{
"status": "affected",
"version": "89aa3619d141d6cfb6040a561aebb6d99d3e2285",
"lessThan": "6d25ffca055a77787c21a36b66c253f76239411b",
"versionType": "git"
}
],
"programFiles": [
"net/ipv4/cipso_ipv4.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.10"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.10",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.12.113",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.57",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.11",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/ipv4/cipso_ipv4.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-99064
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #55746 · Revision 1
- Added to Heist Feed
- Publisher date