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CVE-2024-40995 is a denial-of-service vulnerability in the Linux kernel traffic-control action API in net/sched. When handling requests to add multiple traffic-control actions using the same index, tcf_idr_check_alloc() can repeatedly retry rather than terminating. The second request can block indefinitely behind the first request while the kernel RTNL lock remains held, resulting in hung tasks waiting for that lock. The fix returns -EAGAIN when this condition is encountered, preserving the documented behavior while preventing the infinite loop.
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What an attacker gets, and what they’ve been doing with it.
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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.
9 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Possible infinite loop in Linux traffic-control action ID allocation.
Linux kernel traffic-control action API flaw that can lead to an infinite loop in tcf_idr_check_alloc().
Linux kernel traffic-control action API flaw that can cause an infinite loop in tcf_idr_check_alloc().
Linux kernel traffic-control action API flaw that can cause an infinite loop in tcf_idr_check_alloc().
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.