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Review reviewHigh

CVE-2025-40094

Linux

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_acm: Refactor bind path to use __free() After an bind/unbind cycle, the acm->notify_req is left stale. If a subsequent bind fails, the unified error label attempts to free this stale request, leading to a NULL pointer dereference when accessing ep->ops->free_request. Refactor the error handling in the bind path to use the __free() automatic cleanup mechanism. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 Call trace: usb_ep_free_request+0x2c/0xec gs_free_req+0x30/0x44 acm...

CVSS
7.8
EPSS
0.14%
4.16% percentile
CISA KEV
Not listed
Published
2025.10.30
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_acm: Refactor bind path to use __free() After an bind/unbind cycle, the acm->notify_req is left stale. If a subsequent bind fails, the unified error label attempts to free this stale request, leading to a NULL pointer dereference when accessing ep->ops->free_request. Refactor the error handling in the bind path to use the __free() automatic cleanup mechanism. Unable to handle kernel NULL pointer dereference at virtual address 0000000000000020 Call trace: usb_ep_free_request+0x2c/0xec gs_free_req+0x30/0x44 acm...

Affected product and versions

Product
Linux
Affected versions
>= 1f1ba11b64947051fc32aa15fcccef6463b433f7 < c5d116862dd3ed162d079738a5ebddf9fceea850, >= 1f1ba11b64947051fc32aa15fcccef6463b433f7 < 2b1546f7c5fc6c44555a8e7a2b34229d1dcd2175, >= 1f1ba11b64947051fc32aa15fcccef6463b433f7 < e348d18fb0124b662cfefb3001733b49da428215, >= 1f1ba11b64947051fc32aa15fcccef6463b433f7 < 201a66d8e6630762e760e1d78f1d149da1691e7b, >= 1f1ba11b64947051fc32aa15fcccef6463b433f7 < c4301e4dd6b32faccb744f1c2320e64235b68d3b, >= 1f1ba11b64947051fc32aa15fcccef6463b433f7 < 47b2116e54b4a854600341487e8b55249e926324, >= 2.6.27
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available