Linux Kernel up to 7.2.5 mt7915 mt7915_register_ext_phy use after free

CVSS Meta Temp Score
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CTI Interest Score
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8.7$5k-$25k0.00+

Summaryinfo

A vulnerability identified as very critical has been detected in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. Affected by this issue is the function mt7915_register_ext_phy of the component mt7915. This manipulation causes use after free. This vulnerability is handled as CVE-2026-90353. The attack can be initiated remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 6.1.187/6.6.156/6.12.109/6.18.51/7.2.5. Affected by this vulnerability is the function mt7915_register_ext_phy of the component mt7915. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: wifi: mt76: mt7915: fix ext PHY use-after-free on register error path After mt7915_register_ext_phy() succeeded, a failure of the main PHY mt7915_init_debugfs() or mt7915_coredump_register() unwound through free_phy2, which called ieee80211_free_hw() on the ext PHY hw while it was still registered with mac80211, since mt76_unregister_device() only unregisters the main hw. Unregister the ext PHY (thermal + phy + hw) first and skip the redundant free.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2026-90353 since 09/11/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation needs additional levels of successful authentication. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 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 aa55bec92ba7747dd08feff409f8074c5e052e71/ad706fcf6255494613b94418e7243d98065dbeaf/34058ad122f7524e33df8e38caba4b1d803b025a/a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5/648f5f03ff50d4bd719106ace0cdf1d8be02cbdd/15b960014f24dce5388d4a2e7274e6490cb3c421 is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 9.1
VulDB Meta Temp Score: 8.7

VulDB Base Score: 9.1
VulDB Temp Score: 8.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Use after free
CWE: CWE-416 / 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 6.1.188/6.6.157/6.12.110/6.18.52/7.2.6/7.3-rc1
Patch: aa55bec92ba7747dd08feff409f8074c5e052e71/ad706fcf6255494613b94418e7243d98065dbeaf/34058ad122f7524e33df8e38caba4b1d803b025a/a7fd3bae8e11a7c00df6a5021d9ef248ae9f9bf5/648f5f03ff50d4bd719106ace0cdf1d8be02cbdd/15b960014f24dce5388d4a2e7274e6490cb3c421

Timelineinfo

09/11/2026 CVE reserved
09/17/2026 +6 days Advisory disclosed
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-2026-90353 (🔒)
GCVE (CVE): GCVE-0-2026-90353
GCVE (VulDB): GCVE-100-406891

Entryinfo

Created: 09/17/2026 21:47
Changes: 09/17/2026 21:47 (59)
Complete: 🔍
Cache ID: 216::103

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