Linux Kernel up to 7.2-rc2 netfilter input validation

CVSS Meta Temp Score
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CTI Interest Score
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9.5$5k-$25k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2-rc2. It has been rated as very critical. This vulnerability affects unknown code of the component netfilter. This manipulation causes input validation. This vulnerability appears as CVE-2026-72348. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2-rc2. Affected by this vulnerability is an unknown function of the component netfilter. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. 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: ip6tables: mark malformed IPv6 extension headers for hotdrop The ah, hbh and rt matches check that the fixed extension header is present, then use the header length field to derive the advertised extension header length for matching. For the ah match, add the missing advertised-length check. For hbh and rt, update the existing advertised-length checks. In all three cases, set hotdrop to true before returning false when the advertised extension header length exceeds the available skb data. Returning false treats the packet as a rule mismatch. Set hotdrop to true and drop malformed packets so they cannot bypass rules intended to drop packets with these IPv6 extension headers.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-72348 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. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $5k-$25k 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 f16d856b6af5fd0e7cb0b0212f70825b599ef72e/fc416870100cf16d5b9495199355a679c3a02d48/f775fcf384b06f35b612f78fa5601fee99eb6513/2fd89a50a9783eed8ed23866b11c8b3d8779a7a8/3578b6d92a5b1e603ae6e8c8f5538a709f03aba4/3d441be2b1c5e98167302fa1c7b61960a067b112/d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7/43ccc20b5a733226417832cf16ef45322e594990 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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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Input validation
CWE: CWE-20
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: f16d856b6af5fd0e7cb0b0212f70825b599ef72e/fc416870100cf16d5b9495199355a679c3a02d48/f775fcf384b06f35b612f78fa5601fee99eb6513/2fd89a50a9783eed8ed23866b11c8b3d8779a7a8/3578b6d92a5b1e603ae6e8c8f5538a709f03aba4/3d441be2b1c5e98167302fa1c7b61960a067b112/d5e39e5eb6b30bc4a3bb7aba54c293cf36a806c7/43ccc20b5a733226417832cf16ef45322e594990

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-2026-72348 (🔒)
GCVE (CVE): GCVE-0-2026-72348
GCVE (VulDB): GCVE-100-390943

Entryinfo

Created: 08/15/2026 16:30
Changes: 08/15/2026 16:30 (58)
Complete: 🔍
Cache ID: 216::103

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