Loading vulnerability…
CVE-2025-21727 is a use-after-free vulnerability in the Linux kernel padata subsystem. Concurrent deletion of a cryptographic algorithm can reduce a parallel-data object's reference count to zero and free it while padata_reorder() is still iterating. A subsequent padata_find_next() call then accesses the freed object. KASAN detected a four-byte slab-use-after-free read during Linux Test Project testing. The flaw results from insufficient synchronization between serial processing and object teardown and can cause system instability, denial of service, or potential privilege escalation.
Mallory correlates every CVE against your assets, your vendors, and active adversary campaigns. Know which vulnerabilities matter for you, not just which ones are loud.
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.
28 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A use-after-free vulnerability in the Linux kernel's padata subsystem. Concurrent deletion of a cryptographic algorithm can release a padata structure while padata_reorder still accesses it. The fix adds synchronize_rcu() in padata_free_shell to wait for outstanding serial calls to finish. The advisory rates the vulnerability High, with a CVSS v3 score of 7.8 and a local, low-privilege attack vector.
A high-severity local use-after-free vulnerability in the Linux kernel padata subsystem's reorder path. It affects Google COS installations with sys-kernel/lakitu-kernel-6_1 before version 18244.291.93.
A high-severity local Linux kernel use-after-free vulnerability in the padata subsystem's reorder path. A race during algorithm deletion can free a padata object while padata_reorder continues to use it.
A high-severity Linux kernel use-after-free vulnerability in the padata subsystem's padata_reorder path. A race condition can allow padata_find_next to access a freed padata object after a cryptographic algorithm is deleted.
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.