VulnerabilityPublished 27 May 2026Updated 6 Nov 2026

CVE-2026-45923: Linux kernel · net: usb: catc: enable basic endpoint checking

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in eade522d3e6ac3f3bfb51bfa5b5b4b32bd0b846f : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:20 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in eade522d3e6ac3f3bfb51bfa5b5b4b32bd0b846f, ac7739b78ded519e1d9919a814da3b34120bec8c, a488001a8197da4f9c413eec8f6acbff71c60145 +4

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < eade522d3e6ac3f3bfb51bfa5b5b4b32bd0b846f	Fixed in eade522d3e6ac3f3bfb51bfa5b5b4b32bd0b846f
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ac7739b78ded519e1d9919a814da3b34120bec8c	Fixed in ac7739b78ded519e1d9919a814da3b34120bec8c
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a488001a8197da4f9c413eec8f6acbff71c60145	Fixed in a488001a8197da4f9c413eec8f6acbff71c60145
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 163d04897e57633c5d2e69734e4e4b22bb63f50d	Fixed in 163d04897e57633c5d2e69734e4e4b22bb63f50d
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 36c28b028efba0f42218d41fed12c47ce217c1f1	Fixed in 36c28b028efba0f42218d41fed12c47ce217c1f1
LinuxLinux	Affected ≥ 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 9e7021d2aeae57c323a6f722ed7915686cdcc123	Fixed in 9e7021d2aeae57c323a6f722ed7915686cdcc123

AI-suggested

A fix is available and has been applied in the Linux kernel source as indicated by multiple fixed commit versions. Users and administrators should update to a Linux kernel version including these fixes to ensure endpoint checking is enabled in the catc USB driver. No additional mitigation steps are indicated or required.

Description

A vulnerability in the Linux kernel's USB catc driver was fixed by adding endpoint type verification during device probing. The driver previously used hardcoded endpoint pipes without checking if the USB device's endpoint descriptors matched expected transfer types. This could allow a malformed USB device to present endpoints with unexpected transfer types, potentially causing improper driver behavior. The fix introduces explicit checks of bulk and interrupt endpoints after interface setting, rejecting devices with mismatched descriptors at probe time.

Impact

The vulnerability could allow malformed USB devices to bypass endpoint type validation, potentially causing the driver to misinterpret endpoint behavior. While no direct exploit in the wild is known, this could lead to driver instability or unexpected behavior when interacting with malicious USB devices. No further impact details or exploitation scenarios are provided.

Summary

The Linux kernel's net: usb: catc driver had a flaw where catc_probe() assigned three URBs to hardcoded endpoint pipes (bulk and interrupt) without verifying the endpoint descriptors. This lack of validation meant a malicious or malformed USB device could present endpoints with transfer types different from those assumed by the driver, potentially leading to incorrect operation or instability. The patch adds an enumeration for endpoint numbers and calls to usb_check_bulk_endpoints() and usb_check_int_endpoints() after usb_set_interface() to verify endpoint types before use, rejecting devices with mismatched descriptors during probe. This approach mirrors a previous fix applied to the rtl8150 driver.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 6 Nov 2026, 16:20 UTC

Technical details

References

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