CVE-2026-43424 (GCVE-0-2026-43424)

Vulnerability from cvelistv5 – Published: 2026-05-08 14:21 – Updated: 2026-05-11 22:24
VLAI
Title
usb: gadget: f_tcm: Fix NULL pointer dereferences in nexus handling
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_tcm: Fix NULL pointer dereferences in nexus handling The `tpg->tpg_nexus` pointer in the USB Target driver is dynamically managed and tied to userspace configuration via ConfigFS. It can be NULL if the USB host sends requests before the nexus is fully established or immediately after it is dropped. Currently, functions like `bot_submit_command()` and the data transfer paths retrieve `tv_nexus = tpg->tpg_nexus` and immediately dereference `tv_nexus->tvn_se_sess` without any validation. If a malicious or misconfigured USB host sends a BOT (Bulk-Only Transport) command during this race window, it triggers a NULL pointer dereference, leading to a kernel panic (local DoS). This exposes an inconsistent API usage within the module, as peer functions like `usbg_submit_command()` and `bot_send_bad_response()` correctly implement a NULL check for `tv_nexus` before proceeding. Fix this by bringing consistency to the nexus handling. Add the missing `if (!tv_nexus)` checks to the vulnerable BOT command and request processing paths, aborting the command gracefully with an error instead of crashing the system.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c52661d60f636d17e26ad834457db333bd1df494 , < b9b26d7f3aa288cfa54a7bc68612bab1f153f156 (git)
Affected: c52661d60f636d17e26ad834457db333bd1df494 , < 2a2ef846a54a06c33b5c2d4b0d918583e1e7c0b7 (git)
Affected: c52661d60f636d17e26ad834457db333bd1df494 , < d146f27758049fa55ae4c53785a852d3cf7a18d6 (git)
Affected: c52661d60f636d17e26ad834457db333bd1df494 , < f962ca3b020e13d6714f27e8c36fe742441c58d1 (git)
Affected: c52661d60f636d17e26ad834457db333bd1df494 , < 679d9535aeb15c10bce89c44102004b96624d706 (git)
Affected: c52661d60f636d17e26ad834457db333bd1df494 , < 3d309b37633c4a847fc149939a2c9576f1aa1065 (git)
Affected: c52661d60f636d17e26ad834457db333bd1df494 , < b9fde507355342a2d64225d582dc8b98ff5ecb19 (git)
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Linux Linux Affected: 3.5
Unaffected: 0 , < 3.5 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.