Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in MCC handlers The RFCOMM MCC handlers cast skb->data to protocol-specific structs without validating skb->len first. A malicious remote device can send truncated MCC frames and trigger out-of-bounds reads in these handlers. Fix this by using skb_pull_data() to validate and access the required data before dereferencing it. rfcomm_recv_rpn() requires special handling since ETSI TS 07.10 allows 1-byte RPN requests. Handle this by validating only the DLCI byte first, and validating the full struct only when len > 1.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.12.1, < 5.15.210 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/08b9c1fbe78f4ad3f6250c6541cfaabdbeb81997Patch
- https://git.kernel.org/stable/c/0d637136ce89f9a2309b2c3502402ce400dab0efPatch
- https://git.kernel.org/stable/c/1b070ac9e99c2c2c3a8112943ca98ab6fca7f10cPatch
- https://git.kernel.org/stable/c/23882b828c3c8c51d0c946446a396b10abb3b16bPatch
- https://git.kernel.org/stable/c/3eabc6d47a0ad22b053329997aaf0ec1e581e392Patch
- https://git.kernel.org/stable/c/7c15c7c2878957cbfed93bcc29c13fdace464254Patch
- https://git.kernel.org/stable/c/98377e6b1a1a56561ec66a181573ea2b61b2079ePatch
FAQ
What is CVE-2026-53254?
CVE-2026-53254 is a vulnerability with a CVSS score of 8.1 (HIGH). In the Linux kernel, the following vulnerability has been resolved: Bluetooth: RFCOMM: validate skb length in MCC handlers The RFCOMM MCC handlers cast skb->data to protocol-specific structs without...
How severe is CVE-2026-53254?
CVE-2026-53254 has been rated HIGH with a CVSS base score of 8.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53254?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.