Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.1.4 Handshake handshake_nl_done_doit privileges management

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k1.40+

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.1.4. It has been declared as critical. This vulnerability affects the function handshake_nl_done_doit of the component Handshake. The manipulation results in privileges management. This vulnerability was named CVE-2026-74270. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.144/6.12.96/6.18.39/7.1.4. It has been classified as critical. Affected is the function handshake_nl_done_doit of the component Handshake. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: handshake: Require admin permission for DONE command ACCEPT and DONE are the two downcalls of the handshake genl family, both intended for use by the trusted handshake agent (tlshd). ACCEPT already requires GENL_ADMIN_PERM; DONE has no privilege check at all. The fd-lookup in handshake_nl_done_doit() only confirms that some pending handshake request exists for the supplied sockfd; it does not authenticate the sender. An unprivileged process that guesses or observes a valid sockfd can therefore submit a DONE with HANDSHAKE_A_DONE_STATUS == 0, leaving the kernel consumer to proceed as if the handshake succeeded. A non-zero status on a forged DONE tears down a legitimate in-flight handshake before tlshd can report its real result.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-74270 since 08/15/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/15/2026). The MITRE ATT&CK project declares the attack technique as T1068.

Upgrading to version 6.6.145, 6.12.97, 6.18.40, 7.1.5 or 7.2-rc1 eliminates this vulnerability. Applying the patch 25fb53e43ec006ac69b9e825a7e8a11d63a6083e/b6557f912509abe8e70223373dd7a44d1d4a0d6c/67cec2f1eb9e58719d622e92e2278ceda72dbd85/4dafc411948469277b276724c3b2b4408c02c04c/81246a65303d9635266b1334490142caaf86a11f 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: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
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: Privileges management
CWE: CWE-269 / CWE-266
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 6.6.145/6.12.97/6.18.40/7.1.5/7.2-rc1
Patch: 25fb53e43ec006ac69b9e825a7e8a11d63a6083e/b6557f912509abe8e70223373dd7a44d1d4a0d6c/67cec2f1eb9e58719d622e92e2278ceda72dbd85/4dafc411948469277b276724c3b2b4408c02c04c/81246a65303d9635266b1334490142caaf86a11f

Timelineinfo

08/15/2026 Advisory disclosed
08/15/2026 +0 days CVE reserved
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-2026-74270 (🔒)
GCVE (CVE): GCVE-0-2026-74270
GCVE (VulDB): GCVE-100-390228

Entryinfo

Created: 08/15/2026 08:41
Changes: 08/15/2026 08:41 (59)
Complete: 🔍
Cache ID: 216::103

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