Linux Kernel up to 7.2.4 i2c i2c_del_adapter use after free

CVSS Meta Temp Score
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CTI Interest Score
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7.8$0-$5k0.44

Summaryinfo

A vulnerability, which was classified as very critical, has been found in Linux Kernel up to 7.2.4. The impacted element is the function i2c_del_adapter of the component i2c. Performing a manipulation results in use after free. This vulnerability is cataloged as CVE-2026-89983. The attack must be initiated from a local position. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as very critical has been found in Linux Kernel up to 7.2.4. This affects the function i2c_del_adapter of the component i2c. The manipulation with an unknown input leads to a use after free vulnerability. CWE is classifying the issue as CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. 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: i2c: core: fix debugfs UAF on adapter removal i2c_del_adapter() frees the adapter's debugfs directory before it unregisters the adapter device, but the new_device sysfs attribute stays writable until device_del(). A write racing with removal still reaches i2c_device_probe(), which passes the freed adap->debugfs to debugfs_create_dir() as the new client's parent: BUG: KASAN: slab-use-after-free in lookup_noperm_common+0x407/0x430 Read of size 4 at addr ffff88803ef87810 by task syz.0.61/6090 lookup_noperm_common+0x407/0x430 simple_start_creating+0x9c/0x110 debugfs_start_creating+0xdb/0x1a0 debugfs_create_dir+0x24/0x350 i2c_device_probe+0x814/0xbf0 It's technically possible to create a client after i2c_deregister_clients has run. That client will never be unregistered and make wait_for_completion hang. Close the window by removing the new_device attribute at the start of i2c_del_adapter(). device_remove_file() will drain any clients left.

It is possible to read the advisory at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-89983 since 09/11/2026. The exploitability is told to be easy. Attacking locally is a requirement. Additional levels of successful authentication are needed 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 09/16/2026).

Upgrading to version 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.51, 7.2.5 or 7.3-rc1 eliminates this vulnerability. Applying the patch dc33a9762538b3250ed6b5644a4d44c748be33a6/1f1bcd4eca6caa3e4258d9a31925112539406eb6/f9094ace03e0a532cc6505d2e97b61ae738da4ed/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b/112b3d48084c820bbccf41d9783fd122e3ac4cb0/552836be2d95c688eede6371f85532abe1a71232/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622 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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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 8.2
VulDB Meta Temp Score: 7.8

VulDB Base Score: 8.2
VulDB Temp Score: 7.8
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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

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 5.15.221/6.1.188/6.6.157/6.12.110/6.18.51/7.2.5/7.3-rc1
Patch: dc33a9762538b3250ed6b5644a4d44c748be33a6/1f1bcd4eca6caa3e4258d9a31925112539406eb6/f9094ace03e0a532cc6505d2e97b61ae738da4ed/643fb872aa04342d27dbef52b2b3cf3fe71b2c7b/112b3d48084c820bbccf41d9783fd122e3ac4cb0/552836be2d95c688eede6371f85532abe1a71232/b15b548d52b43ba8ac4652bc2c7244a8dd1e9622

Timelineinfo

09/11/2026 CVE reserved
09/16/2026 +5 days Advisory disclosed
09/16/2026 +0 days VulDB entry created
09/16/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-89983 (🔒)
GCVE (CVE): GCVE-0-2026-89983
GCVE (VulDB): GCVE-100-405819

Entryinfo

Created: 09/16/2026 15:10
Changes: 09/16/2026 15:10 (59)
Complete: 🔍
Cache ID: 216::103

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