CVE-2021-46935

Local Binder IPC interruption via free-space under-accounting

Published Feb 27, 2024 · Updated May 11, 2026

Resource-accounting error in the Binder allocator in Linux allows local users to deplete asynchronous transaction capacity with small parcels. The binder_alloc_free_buf path restores async_free_space with the logical payload size instead of the larger allocated buffer size for parcels under eight bytes. A local low-privileged process must access a Binder device; repeated small asynchronous parcels can exhaust the per-process quota and interrupt Binder IPC.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-accounting error in the Binder allocator in Linux allows local users to deplete asynchronous transaction capacity with small parcels. The binder_alloc_free_buf path restores async_free_space with the logical payload size instead of the larger allocated buffer size for parcels under eight bytes. A local low-privileged process must access a Binder device; repeated small asynchronous parcels can exhaust the per-process quota and interrupt Binder IPC.

The record

CVE
CVE-2021-46935
Published
Feb 27, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-668, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 27, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.14
  2. Affected versionversion=74310e06be4d74dcf67cd108366710dee5c576d5 <103b16a8c51f96d5fe063022869ea906c256e5da
  3. Affected versionversion=74310e06be4d74dcf67cd108366710dee5c576d5 <17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff
  4. Affected versionversion=74310e06be4d74dcf67cd108366710dee5c576d5 <1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4
  5. Affected versionversion=74310e06be4d74dcf67cd108366710dee5c576d5 <2d2df539d05205fd83c404d5f2dff48d36f9b495
  6. Affected versionversion=74310e06be4d74dcf67cd108366710dee5c576d5 <7c7064402609aeb6fb11be1b4ec10673ff17b593
  7. Affected versionversion=74310e06be4d74dcf67cd108366710dee5c576d5 <cfd0d84ba28c18b531648c9d4a35ecca89ad9901

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.14; version=74310e06be4d74dcf67cd108366710dee5c576d5 <103b16a8c51f96d5fe063022869ea906c256e5da; version=74310e06be4d74dcf67cd108366710dee5c576d5 <17691bada6b2f1d5f1c0f6d28cd9d0727023b0ff; version=74310e06be4d74dcf67cd108366710dee5c576d5 <1cb8444f3114f0bb2f6e3bcadcf09aa4a28425d4; version=74310e06be4d74dcf67cd108366710dee5c576d5 <2d2df539d05205fd83c404d5f2dff48d36f9b495; version=74310e06be4d74dcf67cd108366710dee5c576d5 <7c7064402609aeb6fb11be1b4ec10673ff17b593; version=74310e06be4d74dcf67cd108366710dee5c576d5 <cfd0d84ba28c18b531648c9d4a35ecca89ad9901

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-668Exposure of Resource to Wrong Sphere
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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