CVE-2022-42896 — There are use-after-free vulnerabilities in the Linux kernel's net/bluetooth/l2c

There are use-after-free vulnerabilities in the Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect and l2cap_le_connect_req functions which may allow code execution and leaking kernel memory (respectively) remotely via Bluetooth. A remote attacker could execute c

01What is this vulnerability?

There are use-after-free vulnerabilities in the Linux kernel's net/bluetooth/l2cap_core.c's l2cap_connect and l2cap_le_connect_req functions which may allow code execution and leaking kernel memory (respectively) remotely via Bluetooth. A remote attacker could execute code leaking kernel memory via Bluetooth if within proximity of the victim.

02Affected products

No structured affected-product list available — see references below for vendor advisories.

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-11-23T15:15:10.723
• Last modified: 2026-10-14T19:16:52.337

09References

• github.com — https://github.com/torvalds/linux/commit/711f8c3fb3db61897080468586b970c87c61d9e…
• kernel.dance — https://kernel.dance/#711f8c3fb3db61897080468586b970c87c61d9e4
• github.com — https://github.com/torvalds/linux/commit/711f8c3fb3db61897080468586b970c87c61d9e…
• kernel.dance — https://kernel.dance/#711f8c3fb3db61897080468586b970c87c61d9e4
• cert-portal.siemens.com — https://cert-portal.siemens.com/productcert/html/ssa-794697.html