netfilter: reject zero shift in nft_bitwise
In the Linux kernel, the following vulnerability has been resolved: netfilter: reject zero shift in nft_bitwise Reject zero shift operands for nft_bitwise left and right shift expressions during initialization. The carry propagation logic computes the carry from the adjacent 32-bit word using BITS_PER_TYPE(u32) - shift. A zero shift operand turns this into a 32-bit shift, which is undefined behaviour. Reject zero shift operands in the control plane, alongside the existing check for values greater than or equal to 32, so malformed rules never reach the packet path.
CVE-2026-46101
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-2026-46101
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": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "9baa08d6b6b096fad70049533f0d705d85fdc979",
"versionType": "git"
},
{
"status": "affected",
"version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "4fccea585631621c975883911a08d15b6671f7dc",
"versionType": "git"
},
{
"status": "affected",
"version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "9ad26c272405f53834871cc2e46b9b5393a666c3",
"versionType": "git"
},
{
"status": "affected",
"version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "bffef0acec9c3b837a785248a893137fb7f26c95",
"versionType": "git"
},
{
"status": "affected",
"version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "ca24f1243ad1a4d12d6a23876bbbe3ed02099853",
"versionType": "git"
},
{
"status": "affected",
"version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "6f820139d16a4c9865a145d4a9cf9c92cc632c14",
"versionType": "git"
},
{
"status": "affected",
"version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "f370205974f171a5868c13ff30d7642fed46e47b",
"versionType": "git"
},
{
"status": "affected",
"version": "567d746b55bc66d3800c9ae91d50f0c5deb2fd93",
"lessThan": "fe11e5c40817b84abaa5d83bfb6586d8412bfd07",
"versionType": "git"
}
],
"programFiles": [
"net/netfilter/nft_bitwise.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.258",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.140",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.86",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.27",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.0.4",
"versionType": "semver",
"lessThanOrEqual": "7.0.*"
},
{
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/netfilter/nft_bitwise.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-46101
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #28389 · Revision 1
- Added to Heist Feed
- Publisher date