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CVE-2026-45838 is a Linux kernel BPF vulnerability in cgroup_storage_get_next_key() caused by incorrect end-of-list detection. The code used list_next_entry() and then checked the result against NULL, but list_next_entry() does not return NULL when the current element is the last entry; it wraps to the list head via container_of(). As a result, the NULL check was ineffective dead code. When iteration reached the final element, the function failed to return -ENOENT and instead dereferenced a bogus pointer, reading storage->key from memory aliasing internal map fields and copying that value to userspace.
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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.
3 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.