CVE-2026-63991 Details
Description
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 vulnerability in the Linux kernel's Bluetooth 6lowpan implementation can lead to a NULL pointer dereference. The issue arises in the 'send_mcast_pkt()' function, which calls 'skb_clone()' without checking the return value. If memory allocation fails, 'skb_clone()' can return NULL, leading to a dereference of 'skb->data' in the 'send_pkt()' function. This vulnerability affects the Linux kernel stable tree.
Users can upgrade to the latest version of the Linux kernel stable tree, where this vulnerability has been addressed. Instructions for downloading the patched version are available on the official Linux kernel website.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/2061d080a013c0ec0a56162cd501fb36d2befc26 | kernel.org | Patch |
| https://git.kernel.org/stable/c/3c40d381ce04f9575a5d8b542898183c3b4b38dc | kernel.org | Patch |
| https://git.kernel.org/stable/c/3d5d81d294ba09487c86bc4ba33dc4a4bec5d215 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9903a04becf059e44cccf625e23689b7d4378384 | kernel.org | Patch |
| https://git.kernel.org/stable/c/9afcb5ea080af13aab37930da627db43bd277665 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b06203ac5f12929d79146bb9f063c2af1d679e63 | kernel.org | Patch |
| https://git.kernel.org/stable/c/d630c4b25f36e0e68461561e4c70957ec37fdedd | kernel.org | Patch |
| https://git.kernel.org/stable/c/e673889a35a5e4c586d0fae67d8755ca4367d3e2 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-476 | NULL Pointer Dereference | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 3.14, < 5.10.259 >= 5.11, < 5.15.210 >= 5.16, < 6.1.176 >= 6.2, < 6.6.143 >= 6.7, < 6.12.93 >= 6.13, < 6.18.35 >= 6.19, < 7.0.12 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 7.1 rc5 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 7, 2026 | Initial Analysis | [email protected] |
| Jul 19, 2026 | New CVE Received | kernel.org |