CVE-2026-63908

Adjacent-object overwrite via off-by-one boundary check

Published Jul 19, 2026 · Updated Jul 19, 2026

Out-of-bounds write in the Linux kernel atmel_mxt_ts driver allows local users to overwrite adjacent memory via a crafted configuration file. The mxt_prepare_cfg_mem loop accepts an index equal to mxt_obj_size(object), calculates byte_offset for the extra byte, and writes into the next instance or object. Reachability requires a configuration file with an oversized object and the affected touchscreen driver; no consequence beyond the one-byte overwrite is documented.

CVSS severity2.1
Low
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the Linux kernel atmel_mxt_ts driver allows local users to overwrite adjacent memory via a crafted configuration file. The mxt_prepare_cfg_mem loop accepts an index equal to mxt_obj_size(object), calculates byte_offset for the extra byte, and writes into the next instance or object. Reachability requires a configuration file with an oversized object and the affected touchscreen driver; no consequence beyond the one-byte overwrite is documented.

The record

CVE
CVE-2026-63908
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 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=3.17
  2. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <1017e1c6c6c49cccbcda9bbcfa49e50b0b6dad39
  3. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <5c3681c3abc35cfac6b702251382312c60d96bc2
  4. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <6c6b989b4ebf22b086fdfcac2163b5cb55e34d8f
  5. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <7f95f4792c0dc767fcb8e405391e779ab419d55a
  6. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <862a1a32b5190241fce7a7d20229539a3926f31e
  7. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <ae92e334544263a02d9f99e18385e718c44392c9
  8. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <baa0210fb6a9dc3882509a9411b6d284d88fe30e
  9. Affected versionversion=50a77c658b80e7e3303e3bcec195b30e2b62d513 <e9b62996ba537774f68fecfd7eecb5aec1713952

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.17; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <1017e1c6c6c49cccbcda9bbcfa49e50b0b6dad39; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <5c3681c3abc35cfac6b702251382312c60d96bc2; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <6c6b989b4ebf22b086fdfcac2163b5cb55e34d8f; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <7f95f4792c0dc767fcb8e405391e779ab419d55a; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <862a1a32b5190241fce7a7d20229539a3926f31e; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <ae92e334544263a02d9f99e18385e718c44392c9; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <baa0210fb6a9dc3882509a9411b6d284d88fe30e; version=50a77c658b80e7e3303e3bcec195b30e2b62d513 <e9b62996ba537774f68fecfd7eecb5aec1713952

Published CVSS scores

2.1TenableAV:L/AC:L/Au:N/C:P/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write

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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