CVE-2026-72350netfilter: xt_u32: reject invalid shift counts
Updated under an hour ago ()
Does this affect you?
It affects Linux. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1b50b8a371e90a5e110f466e4ac02cf6b5f681de before ca7c92d9701249e6daf132087756a88cbf2bb2a3; from 1b50b8a371e90a5e110f466e4ac02cf6b5f681de before b33b44250d57ab0e5a1e2571b5285fb0d0a7f382; from 1b50b8a371e90a5e110f466e4ac02cf6b5f681de before 728f479dc0447ae7eaef87926ff49142e415a811; 1b50b8a371e90a5e110f466e4ac02cf6b5f681de builds before 0a8b7a6d763775709c601f584e709ae48bcc000a; from 1b50b8a371e90a5e110f466e4ac02cf6b5f681de before cce42014415cecd98aa49b3950e7b02ee7c81268; from 1b50b8a371e90a5e110f466e4ac02cf6b5f681de before a597a722fb71a534138c20359b655726622b5f17; 1b50b8a371e90a5e110f466e4ac02cf6b5f681de builds before 00d034fe8230dfc5832fe011ff2d81c1a2cc7a29; from 1b50b8a371e90a5e110f466e4ac02cf6b5f681de before 64cdf7d30ac18e43df6c48004435febb965809a8 | CNA record |
References
- https://git.kernel.org/stable/c/ca7c92d9701249e6daf132087756a88cbf2bb2a3
- https://git.kernel.org/stable/c/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382
- https://git.kernel.org/stable/c/728f479dc0447ae7eaef87926ff49142e415a811
- https://git.kernel.org/stable/c/0a8b7a6d763775709c601f584e709ae48bcc000a
- https://git.kernel.org/stable/c/cce42014415cecd98aa49b3950e7b02ee7c81268
- https://git.kernel.org/stable/c/a597a722fb71a534138c20359b655726622b5f17
- https://git.kernel.org/stable/c/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29
- https://git.kernel.org/stable/c/64cdf7d30ac18e43df6c48004435febb965809a8
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.