Linux Kernel up to 6.6.151/6.12.103/6.18.44/7.1.8 Fastrpc fastrpc_req_munmap_impl race condition

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-$5k2.15-

Summaryinfo

A vulnerability, which was classified as very critical, was found in Linux Kernel up to 6.6.151/6.12.103/6.18.44/7.1.8. This affects the function fastrpc_req_munmap_impl of the component Fastrpc. Such manipulation leads to race condition. This vulnerability is traded as CVE-2026-74647. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.151/6.12.103/6.18.44/7.1.8. It has been rated as very critical. Affected by this issue is the function fastrpc_req_munmap_impl of the component Fastrpc. The manipulation with an unknown input leads to a race condition vulnerability. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: Remove buffer from list prior to unmap operation fastrpc_req_munmap_impl() is called to unmap any buffer. The buffer is getting removed from the list after it is unmapped from DSP. This can create potential race conditions if multiple threads invoke unmap concurrently, where one thread may remove the entry from the list while another thread's unmap operation is still ongoing. Fix this by removing the buffer entry from the list before calling the unmap operation. If the unmap fails, the entry is re-added to the list so that userspace can retry the unmap, or alternatively, the buffer will be cleaned up during device release when the DSP process is torn down and all DSP-side mappings are freed along with remaining buffers in the list.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2026-74647 since 08/15/2026. The exploitation is known to be easy. The attack may be launched remotely. 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 08/22/2026).

Upgrading to version 6.6.152, 6.12.104, 6.18.45 or 7.1.9 eliminates this vulnerability. Applying the patch 97273624f7b356eaf8261609a75cfcb8738a165a/fe70329055977fc1e8dc6291318d0dd75470795a/9bf22a7d950cec2d1efeca7f16bb20fcca84c36a/0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5/6102ceb4eab845743ee57acd3863fbd06e93c927 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: Race condition
CWE: CWE-362
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 6.6.152/6.12.104/6.18.45/7.1.9
Patch: 97273624f7b356eaf8261609a75cfcb8738a165a/fe70329055977fc1e8dc6291318d0dd75470795a/9bf22a7d950cec2d1efeca7f16bb20fcca84c36a/0beaa9bd7eb10d9b5e6352ed5161f3f3bbd4c3c5/6102ceb4eab845743ee57acd3863fbd06e93c927

Timelineinfo

08/15/2026 CVE reserved
08/22/2026 +7 days Advisory disclosed
08/22/2026 +0 days VulDB entry created
08/22/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-74647 (🔒)
GCVE (CVE): GCVE-0-2026-74647
GCVE (VulDB): GCVE-100-394424

Entryinfo

Created: 08/22/2026 18:35
Changes: 08/22/2026 18:35 (59)
Complete: 🔍
Cache ID: 216::103

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