Linux Kernel up to 7.2-rc2 xt_u32 u32_mt_checkentry out-of-bounds

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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9.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2-rc2. It has been rated as very critical. This affects the function u32_mt_checkentry of the component xt_u32. This manipulation causes out-of-bounds. This vulnerability appears as CVE-2026-72350. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.2-rc2. It has been declared as very critical. Affected by this vulnerability is the function u32_mt_checkentry of the component xt_u32. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2026-72350 since 08/09/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/15/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc3 eliminates this vulnerability. Applying the patch ca7c92d9701249e6daf132087756a88cbf2bb2a3/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382/728f479dc0447ae7eaef87926ff49142e415a811/0a8b7a6d763775709c601f584e709ae48bcc000a/cce42014415cecd98aa49b3950e7b02ee7c81268/a597a722fb71a534138c20359b655726622b5f17/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29/64cdf7d30ac18e43df6c48004435febb965809a8 is able to eliminate this problem.

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Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 10.0
VulDB Meta Temp Score: 9.5

VulDB Base Score: 10.0
VulDB Temp Score: 9.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.261/5.15.212/6.1.178/6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc3
Patch: ca7c92d9701249e6daf132087756a88cbf2bb2a3/b33b44250d57ab0e5a1e2571b5285fb0d0a7f382/728f479dc0447ae7eaef87926ff49142e415a811/0a8b7a6d763775709c601f584e709ae48bcc000a/cce42014415cecd98aa49b3950e7b02ee7c81268/a597a722fb71a534138c20359b655726622b5f17/00d034fe8230dfc5832fe011ff2d81c1a2cc7a29/64cdf7d30ac18e43df6c48004435febb965809a8

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72350 (🔒)
GCVE (CVE): GCVE-0-2026-72350
GCVE (VulDB): GCVE-100-390733

Entryinfo

Created: 08/15/2026 14:34
Changes: 08/15/2026 14:34 (59)
Complete: 🔍
Cache ID: 216::103

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