VulnerabilityPublished 28 Dec 2024Updated 10 Nov 2026

CVE-2024-56703: Linux kernel · Infinite Loop

Affects Linux kernelSource GCVE Database

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Not known to be exploited · CVSS 7.5 High.

Data as of 10 Nov 2026, 14:17 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

Contested

Scorers differ by 2 or more points

CVSS scores by source
CNA (Linux)	CVSS 3.1	7.5
CISA-ADP	CVSS 3.1	5.5

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Dec 2024
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 10 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

AI-suggested

A fix for this vulnerability has been implemented by applying RCU primitives to the fib6_select_path function to safely handle concurrent modifications of the routing multipath linked list. Users should apply the official Linux kernel patch that includes these changes. No alternative mitigations or workarounds are described.

Description

CVE-2024-56703 is a vulnerability in the Linux kernel's IPv6 implementation causing soft lockups in the fib6_select_path function under conditions of high next hop churn. This occurs when concurrent deletions in the multipath linked list cause infinite loops, leading to system panics triggered by the watchdog timer. The issue affects Linux-based edge routers in dynamic environments with frequent BGP route updates and heavy IPv6 traffic. The fix involves applying RCU primitives to safely manage concurrent access to the fib6_siblings linked list.

Impact

The vulnerability causes soft lockups in the Linux kernel, resulting in system panics and potential denial of service on affected Linux-based edge routers. This impacts availability but does not affect confidentiality or integrity. The issue arises under specific conditions of high next hop churn and heavy IPv6 traffic, making it particularly relevant for dynamic routing environments using BGP. There is no evidence of exploitation in the wild or impact on data confidentiality or integrity.

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Exploitation evidence

What to do

Description

AI analysisMachine-generated, updated 10 Nov 2026, 14:17 UTC

WeaknessesCWE-835

Technical details

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