VulnSocial

CVE-2026-63991General(linux / linux_kernel)

LOWCVSS 5.5 · MEDIUM

Signal is active with 2 mentions in latest observed window

Immediate actions

  • Patch linux linux_kernel systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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.

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0.5/ 10 priority

Sources & remediation

Patch / fix
Weakness type (CWE)
CWE-476

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

NONE

Are you affected?

If you run products in this scope, you should treat this CVE as relevant to your environment.

  • linux_kernel

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • General: 1 classified signal
  • 2 total mentions across 1 day

Affected systems

Vendors
linux
Products
linux_kernel

1 version affected across 1 product

Deep dive

Activity timeline2 mentions / 1d
01122Mentions · 2026-07-19: 2Patch / Workaround · 2026-07-19: 1Technical Details · 2026-07-19: 207-19
Signal classification2 categories
General
150.0%
Patch
150.0%
Referenced assets2 URLs
By indicator
Full discourse2 posts
  • Infoflowcloud@infoflowcloud
    General

    🚨*CVE* CVE-2026-63991 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 … https://www.cve.org/CVERecord?id=CVE-2026-63991 ----- Traducción: CVE-2026-63991 En … http://infoflow.cloud`

    Post summary

    The tweet merely announces that CVE-2026-63991, a Linux kernel issue related to Bluetooth 6lowpan’s skb_clone return value, has been resolved, without providing additional details such as a PoC, exploit, active usage, or patch information.

    0000028
    92 followersView on X
  • CVE@CVEnew
    Patch

    CVE-2026-63991 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 … https://www.cve.org/CVERecord?id=CVE-2026-63991

    Post summary

    CVE-2026-63991 describes a Linux kernel Bluetooth 6lowpan bug that has been fixed by verifying skb_clone()'s return value; no exploitation or PoC details are disclosed.

    00000393
    57.8K followersView on X
CPE platform detail6 entries

6 of 6 entries

PartVendorProductVersionTarget SWTarget HW
OSlinuxlinux_kernel---
OSlinuxlinux_kernel7.1--
OSlinuxlinux_kernel7.1--
OSlinuxlinux_kernel7.1--
OSlinuxlinux_kernel7.1--
OSlinuxlinux_kernel7.1--

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