Linux Kernel up to 7.2.5 configfs os_desc_qw_sign_show out-of-bounds

CVSS Meta Temp Score
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CTI Interest Score
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4.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.2.5. It has been rated as problematic. The affected element is the function os_desc_qw_sign_show of the component configfs. Performing a manipulation results in out-of-bounds. This vulnerability is reported as CVE-2026-93120. The attack is possible to be carried out remotely. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 7.2.5. This affects the function os_desc_qw_sign_show of the component configfs. The manipulation with an unknown input leads to a out-of-bounds vulnerability. CWE is classifying the issue as CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: usb: gadget: configfs: fix out-of-bounds read of qw_sign os_desc_qw_sign_show() passes OS_STRING_QW_SIGN_LEN as the input length to utf16s_to_utf8s(), but that argument counts UTF-16 code units while OS_STRING_QW_SIGN_LEN (14) is the byte size of qw_sign[]. The array holds only OS_STRING_QW_SIGN_LEN / 2 (7) code units, so the conversion reads up to 7 units (14 bytes) past the end of qw_sign[] into the following members of struct gadget_info when the stored signature fills the array without a NUL terminator, exposing those bytes through the configfs attribute. The store path halves the count for its input bound but passes the full byte count as the utf8s_to_utf16s() output limit; use the destination code-unit count in both directions.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-93120 since 09/17/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch b895dbed8ac9e12a5ffa1a2165575a8469f8340d/9b45125501aad2dff7730970461b455b0e0658ee/f6da500b0f8106882598b6dec87fe37d653946cf/a28c486434634f6d1e120711d2b09f3eddea6c98/7e94cb967778e074411940db4db97f22ed77560c/afbf39c0f2297c6abef6d670a82a2079b0836191/36315a330e067f7773196940552feacb1debbef1/f63edb54d8f738f9c21e2068c777ae1c097df6b7 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.7
VulDB Meta Temp Score: 4.5

VulDB Base Score: 4.7
VulDB Temp Score: 4.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.10.270/5.15.221/6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: b895dbed8ac9e12a5ffa1a2165575a8469f8340d/9b45125501aad2dff7730970461b455b0e0658ee/f6da500b0f8106882598b6dec87fe37d653946cf/a28c486434634f6d1e120711d2b09f3eddea6c98/7e94cb967778e074411940db4db97f22ed77560c/afbf39c0f2297c6abef6d670a82a2079b0836191/36315a330e067f7773196940552feacb1debbef1/f63edb54d8f738f9c21e2068c777ae1c097df6b7

Timelineinfo

09/17/2026 Advisory disclosed
09/17/2026 +0 days CVE reserved
09/17/2026 +0 days VulDB entry created
09/17/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-93120 (🔒)
GCVE (CVE): GCVE-0-2026-93120
GCVE (VulDB): GCVE-100-407127

Entryinfo

Created: 09/17/2026 23:18
Changes: 09/17/2026 23:18 (59)
Complete: 🔍
Cache ID: 216::103

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