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CVE-2023-52340 is an uncontrolled resource-consumption vulnerability in the Linux kernel IPv6 routing implementation before version 6.3. ICMPv6 Packet Too Big processing creates and updates IPv6 destination-route exceptions used for path-MTU handling. An attacker can generate sufficient Packet Too Big traffic to grow destination-route-cache activity beyond garbage-collection thresholds. Forced garbage collection scans cache entries while holding a global lock, contending with exception insertion paths and causing substantial lock contention in networking interrupt processing.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Kernel packet-processing memory corruption vulnerability in the underlying OS networking stack (IPv4/IPv6 handling) that can lead to crashes/denial of service.
Underlying OS kernel vulnerability affecting IPv4/IPv6 packet processing, with potential impact including Denial-of-Service and memory corruption on affected HPE Instant On devices.
Unknown.
Linux kernel denial-of-service vulnerability where ICMPv6 Packet Too Big messages can force 100% CPU utilization.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.