HighFix available
netfilter: xt_u32: reject invalid shift counts
Type: advisorySources: OSV
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.
- Products
- Kernel
- Affected versions
- Not specified
- Fixed versions
- 5.10.261, 5.15.212, 6.1.178, 6.12.97, 6.18.40, 6.6.145, 7.1.5
- CVEs
- CVE-2026-72350
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 11:06 UTC · Revision 1
Source evidence
netfilter: xt_u32: reject invalid shift counts
core-osv · Original sourcePublished 15 Aug 2026, 05:55 UTC
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.
osv:CVE-2026-72350
Kernel
Fixed versions: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
Complete source record
{
"id": "973e315db9f0a878b21bcd1a34334a2e7a6cfccda3718c8a617933f06c3c05f0",
"url": "https://osv.dev/vulnerability/CVE-2026-72350",
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"title": "netfilter: xt_u32: reject invalid shift counts",
"summary": "In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.",
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"modified": "2026-10-28T02:30:50.557607110Z",
"provider": "osv",
"references": [
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"https://nvd.nist.gov/vuln/detail/CVE-2026-72350",
"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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"security_relevant": true,
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"source_id": "core-osv",
"document_id": 519081,
"published_at": "2026-08-15T05:55:53.532+00:00"
}