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Vulnerabilities
Vulnerability

CVE-2026-63991

Reference data from vuln.mlab.sh, coverage from our own index.

CVSS
5.5 Medium
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS
0.18%
Risk score
4.0
Published
2026-07-19
Status
Published

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: 6lowpan: check skb_clone() return value in send_mcast_pkt() The skb_clone() function can return NULL if memory allocation fails. send_mcast_pkt() calls skb_clone() without checking the return value, which can lead to a NULL pointer dereference in send_pkt() when it dereferences skb->data. Add a NULL check after skb_clone() and skip the peer if the clone fails. A flaw was found in the Linux kernel's Bluetooth 6lowpan module. This vulnerability occurs because the `send_mcast_pkt()` function does not properly check the return value of `skb_clone()`, which can be null if memory allocation fails. An attacker could exploit this by triggering a scenario where `skb_clone()` returns null, leading to a null pointer dereference. This can result in a system crash, causing a denial of service (DoS).

Weaknesses

CWE-476

Coverage 5

Advisories and references