Bug 2555027 (CVE-2026-98602)

Summary: CVE-2026-98602 kernel: Bluetooth: bnep: fix out-of-bounds reads on short RX/TX frames and control fallthrough
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Bluetooth Network Encapsulation Protocol (BNEP) implementation. Insufficient length validation when processing network frames allows out-of-bounds memory read operations. An attacker can exploit this vulnerability by transmitting malformed or truncated network frames, leading to a Denial of Service (DoS) via a system crash or information disclosure through leaked kernel memory.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-18 15:40:07 UTC 
In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: bnep: fix out-of-bounds reads on short RX/TX frames and control fallthrough

Fix multiple out-of-bounds reads in Bluetooth BNEP frame processing:

1. In bnep_rx_frame() and bnep_ctrl_frame() (net/bluetooth/bnep/core.c),
   use pskb_may_pull() to verify the BNEP header, control type byte,
   filter count, and extension headers exist before reading them, and
   return 0 after handling BNEP_CONTROL instead of falling through to
   Ethernet frame submission when no extension headers follow.
2. In bnep_net_xmit() (net/bluetooth/bnep/netdev.c), verify skb->len >=
   ETH_HLEN with pskb_may_pull() before reading the 14-byte Ethernet
   header to prevent an out-of-bounds heap read and infoleak on short
   AF_PACKET TX frames.
Comment 1 Mauro Matteo Cascella 2026-10-20 15:44:16 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98602.mbox