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CVE-2021-20265 is an uncontrolled resource-consumption vulnerability in the Linux kernel's UNIX-domain stream socket receive path. When a signal is pending during execution of unix_stream_recvmsg, memory resources are improperly freed, resulting in an increasing slab-memory leak. A local unprivileged user can repeatedly trigger the flawed condition until available memory is exhausted, causing the system to crash or become unavailable.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
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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.
5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A Linux kernel slab-memory leak vulnerability that can lead to denial of service.
A Linux kernel slab-memory leak vulnerability that can lead to denial of service.
A Linux kernel slab-memory leak vulnerability that can lead to denial of service.
A moderate-severity Linux kernel denial-of-service vulnerability caused by improper freeing of memory resources in unix_stream_recvmsg when a signal is pending. An unprivileged local user can exhaust memory and crash the system; the primary impact is availability.
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.