CVE-2026-63956

USB: serial: cypress_m8: fix memory corruption with small endpoint

HIGH

7.8

CVSS Score

Published: July 19, 2026 at 02:55 PM UTC

Updated: October 30, 2026 at 02:32 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.2%

Description

In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: fix memory corruption with small endpoint Make sure that the interrupt-out endpoint max packet size is at least eight bytes to avoid user-controlled slab corruption or NULL-pointer dereference should a malicious device report a smaller size.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.26 ≤ v < 5.10.2595.11 ≤ v < 5.15.2105.16 ≤ v < 6.1.1766.13 ≤ v < 6.18.356.19 ≤ v < 7.0.126.2 ≤ v < 6.6.1436.7 ≤ v < 6.12.932.6.263416eaa1f8f8d516b77de514e14cf8da256d28fb7.1

Vendor states this is fixed in 1ef25704bd3b625fd151c09feee459479f71ee64 (fixed)

Vendor states this is fixed in 284105c40fc31fff90cdab8a0377aaeb92f87f0e (fixed)

Vendor states this is fixed in 4bcaa59f403dbde6328604a500d65ee8d40975d9 (fixed)

Vendor states this is fixed in 4fcb22218f0a7229b7ce3b3952fb644def293fa5 (fixed)

Vendor states this is fixed in 52e18ae0c47c5c89e18fcd8022f287f7cc8802ec (fixed)

Vendor states this is fixed in 6c13f3bb652bc8665e709ba07122612586aea648 (fixed)

Vendor states this is fixed in ad3d1628a46134276546d7a12fedf04be9979158 (fixed)

Vendor states this is fixed in e1a9d791fd66ab2431b9e6f6f835823809869047 (fixed)

Vendor states this is fixed in 2.6.26 (unaffected)

Vendor states this is fixed in 5.10.259 (unaffected)

Vendor states this is fixed in 5.15.210 (unaffected)

Vendor states this is fixed in 6.1.176 (unaffected)