Linux Kernel up to 7.1.3 pcrypt pcrypt_aead_done improper synchronization

CVSS Meta Temp Score
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CTI Interest Score
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9.5$0-$5k1.59-

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.3. It has been declared as very critical. Impacted is the function pcrypt_aead_done of the component pcrypt. Such manipulation leads to improper synchronization. This vulnerability is uniquely identified as CVE-2026-64312. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 7.1.3. It has been rated as very critical. Affected by this issue is the function pcrypt_aead_done of the component pcrypt. The manipulation with an unknown input leads to a improper synchronization vulnerability. Using CWE to declare the problem leads to CWE-662. The product utilizes multiple threads or processes to allow temporary access to a shared resource that can only be exclusive to one process at a time, but it does not properly synchronize these actions, which might cause simultaneous accesses of this resource by multiple threads or processes. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: crypto: pcrypt - restore callback for non-parallel fallback pcrypt installs pcrypt_aead_done() on the child AEAD request before trying to submit it through padata. If padata_do_parallel() returns -EBUSY, pcrypt falls back to calling the child AEAD directly. That fallback must not keep the padata completion callback. Otherwise an asynchronous completion runs pcrypt_aead_done() even though the request was never enrolled in padata. Restore the original request callback and callback data before calling the child AEAD directly. This keeps the fallback path aligned with a direct AEAD request while leaving the parallel path unchanged.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2026-64312 since 07/19/2026. The exploitation is known to be easy. The attack may be launched remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch 81ce16d938db9b88cdc231522c0358395ae8c6b5/3920c5f6edc341729d20d0507e466c6d3b11f372/ae93c5b3e2a2968b56d772ca1d06615927b7cc36/82789a44415e3e31168229421b138278dfb16412/4711ca06bd169a2cbc9cc59a6de2ed512c41a880/c4bd2f4c35b0e15b6040c2f7e7e7986780c066cf/83fa1397d5853de1e27dd52ec44b068ff358ca18/ed459fe319376e876de433d12b6c6772e612ca36 is able to eliminate this problem.

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Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.9
VulDB Meta Temp Score: 9.5

VulDB Base Score: 9.9
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: Improper synchronization
CWE: CWE-662
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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 5.10.261/5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: 81ce16d938db9b88cdc231522c0358395ae8c6b5/3920c5f6edc341729d20d0507e466c6d3b11f372/ae93c5b3e2a2968b56d772ca1d06615927b7cc36/82789a44415e3e31168229421b138278dfb16412/4711ca06bd169a2cbc9cc59a6de2ed512c41a880/c4bd2f4c35b0e15b6040c2f7e7e7986780c066cf/83fa1397d5853de1e27dd52ec44b068ff358ca18/ed459fe319376e876de433d12b6c6772e612ca36

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64312 (🔒)
GCVE (CVE): GCVE-0-2026-64312
GCVE (VulDB): GCVE-100-383102

Entryinfo

Created: 07/25/2026 14:42
Changes: 07/25/2026 14:42 (59)
Complete: 🔍
Cache ID: 216::103

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