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CVE-2026-72350

HIGHCVSS 7.8/10EPSS 0.22%

Last modified

CVE-2026-72350 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.22% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.22%

12.8th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < ca7c92d9701249e6daf132087756a88cbf2bb2a3; >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < b33b44250d57ab0e5a1e2571b5285fb0d0a7f382; >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < 728f479dc0447ae7eaef87926ff49142e415a811; >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < 0a8b7a6d763775709c601f584e709ae48bcc000a; >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < cce42014415cecd98aa49b3950e7b02ee7c81268; >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < a597a722fb71a534138c20359b655726622b5f17; >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < 00d034fe8230dfc5832fe011ff2d81c1a2cc7a29; >= 1b50b8a371e90a5e110f466e4ac02cf6b5f681de, < 64cdf7d30ac18e43df6c48004435febb965809a8
LinuxLinux2.6.23

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-72350?
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.
How severe is CVE-2026-72350?
CVE-2026-72350 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.22% probability of exploitation in the next 30 days.
How do I fix CVE-2026-72350?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST