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CVE-2026-43011Disclosure(linux / linux_kernel)

LOWCVSS 9.8 · CRITICAL

Signal is active with 4 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: net/x25: Fix potential double free of skb When alloc_skb fails in x25_queue_rx_frame it calls kfree_skb(skb) at line 48 and returns 1 (error). This error propagates back through the call chain: x25_queue_rx_frame returns 1 | v x25_state3_machine receives the return value 1 and takes the else branch at line 278, setting queued=0 and returning 0 | v x25_process_rx_frame returns queued=0 | v x25_backlog_rcv at line 452 sees queued=0 and calls kfree_skb(skb) again This would free the same skb twice. Looking at x25_backlog_rcv: net/x25/x25_in.c:x25_backlog_rcv() { ... queued = x25_process_rx_frame(sk, skb); ... if (!queued) kfree_skb(skb); }

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0.5/ 10 priority

Sources & remediation

Patch / fix
Other references
Weakness type (CWE)
CWE-415

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
  • 4 mentions across 1 observed day

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 3 signals
  • Disclosure: 2 classified signals
  • General: 2 classified signals
  • 4 total mentions across 1 day

Affected systems

Vendors
linux
Products
linux_kernel

2 versions affected across 1 product

Deep dive

Activity timeline4 mentions / 1d
01234Mentions · 2026-05-13: 4Patch / Workaround · 2026-05-13: 1Technical Details · 2026-05-13: 305-13
Signal classification2 categories
Disclosure
250.0%
General
250.0%
Referenced assets1 URL
By indicator
Full discourse4 posts
  • Lyrie.ai@lyrie_ai
    Disclosure

    When allocskb fails in x25queuerxframe it calls kfreeskb(skb) at line 48 and returns 1 (error). This error propagates back through the call chain: CVE: CVE-2026-43011 CVSS: 9.8 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity: CRITICAL Status: Critical…

    Post summary

    The text discloses a critical kernel vulnerability (CVE-2026-43011) with a high CVSS score, but it provides no evidence of PoC, exploit code, active exploitation, or mitigation advice.

    1000031
    210 followersView on X
  • Lyrie.ai@lyrie_ai
    General

    CRITICAL: CVE-2026-43011 (CVSS 9.8) — multiple products. CVE: CVE-2026-43011 CVSS: 9.8 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity: CRITICAL Status: Critical advisory

    Post summary

    An advisory announces CVE-2026-43011 as a critical vulnerability (CVSS 9.8) without providing any PoC, exploit, patch, or evidence of active exploitation.

    1000033
    210 followersView on X
  • Lyrie.ai@lyrie_ai
    Disclosure

    CVE: CVE-2026-43011 CVSS: 9.8 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Severity: CRITICAL Status: Critical advisory In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix potential double free of skb When allocskb fails in…

    Post summary

    CVE‑2026‑43011 is a critical double‑free vulnerability in Linux kernel net/x25 (CVSS 9.8) that has been fixed and resolved per advisory.

    1000036
    210 followersView on X
  • Lyrie.ai@lyrie_ai
    General

    https://lyrie.ai/research/research/cve-2026-43011-advisory #lyrie #cybersecurity #CVE #threatintel #zerodayattack

    Post summary

    The text only cites a URL and hashtags, providing no concrete details about the CVE’s exploitation status, PoC, or mitigation.

    0000027
    210 followersView on X
CPE platform detail12 entries

12 of 12 entries

PartVendorProductVersionTarget SWTarget HW
OSlinuxlinux_kernel---
OSlinuxlinux_kernel2.6.12--
OSlinuxlinux_kernel2.6.12--
OSlinuxlinux_kernel2.6.12--
OSlinuxlinux_kernel2.6.12--
OSlinuxlinux_kernel2.6.12--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--
OSlinuxlinux_kernel7.0--

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