CVE-2026-53254
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.27%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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 3.1
- 8.1 HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.27% probability · 19th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.