netfilter: x_tables: guard option walkers against 1-byte tail reads
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: guard option walkers against 1-byte tail reads When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area. Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.
CVE-2026-43452
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-2026-43452
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": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "c2a445367a496a3c25dbc940c10c8bd1cfd4c14a",
"versionType": "git"
},
{
"status": "affected",
"version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "ae1e1267650638136b84c23f2b31250f0ccb6823",
"versionType": "git"
},
{
"status": "affected",
"version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "c39f84e4be1be63fc60ca7141ea7b76edcea5907",
"versionType": "git"
},
{
"status": "affected",
"version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "9b94f0e42ed248eb31929da84ed9f5310d7ff540",
"versionType": "git"
},
{
"status": "affected",
"version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c",
"versionType": "git"
},
{
"status": "affected",
"version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "bc18551c6169eac5ed813778d3e3e484002dbbe5",
"versionType": "git"
},
{
"status": "affected",
"version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "d04800323336eebf441d153f43234eac9b833d36",
"versionType": "git"
},
{
"status": "affected",
"version": "2e4e6a17af35be359cc8f1c924f8f198fbd478cc",
"lessThan": "cfe770220ac2dbd3e104c6b45094037455da81d4",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/xt_dccp.c",
"net/netfilter/xt_tcpudp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "2.6.16",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.167",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.19",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.9",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/xt_dccp.c",
"net/netfilter/xt_tcpudp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-43452
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #40078 · Revision 1
- Added to Heist Feed
- Publisher date