netfilter: xt_connmark: reject invalid shift parameters
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_connmark: reject invalid shift parameters Revision 2 of the CONNMARK target accepts user-controlled shift parameters and applies them to 32-bit mark values in connmark_tg_shift(). A shift_bits value of 32 or more triggers an undefined-shift bug when the rule is evaluated. Invalid shift_dir values are also accepted and silently fall back to the left-shift path. Reject invalid revision-2 shift parameters in connmark_tg_check() so malformed rules fail at installation time, before they can reach the packet path.
CVE-2026-72347
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-2026-72347
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": "472a73e00757b971d613d796374d2727b2e4954d",
"lessThan": "d8ce63d928b457fba7ed1e302492dfd32293671c",
"versionType": "git"
},
{
"status": "affected",
"version": "472a73e00757b971d613d796374d2727b2e4954d",
"lessThan": "9657bb11a6376ab0a79f05d433713d6944111e9d",
"versionType": "git"
},
{
"status": "affected",
"version": "472a73e00757b971d613d796374d2727b2e4954d",
"lessThan": "8ace320ac4416f5e5fbcd065309fb2dfcce787b0",
"versionType": "git"
},
{
"status": "affected",
"version": "472a73e00757b971d613d796374d2727b2e4954d",
"lessThan": "c3fa852d117b3fda72265e4230e3967db4a74fcf",
"versionType": "git"
},
{
"status": "affected",
"version": "472a73e00757b971d613d796374d2727b2e4954d",
"lessThan": "4eef84b09a3836919360c4232b0f16651a155eec",
"versionType": "git"
},
{
"status": "affected",
"version": "472a73e00757b971d613d796374d2727b2e4954d",
"lessThan": "230173cc6105bdfb2696d37e6e56687b003fbe63",
"versionType": "git"
},
{
"status": "affected",
"version": "472a73e00757b971d613d796374d2727b2e4954d",
"lessThan": "1b47026fb4b35bac850ad6e8a4ad7fc018e09ebc",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/xt_connmark.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.17"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.17",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/xt_connmark.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-72347
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #33032 · Revision 1
- Added to Heist Feed
- Publisher date