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CVE-2023-31248 is a use-after-free vulnerability in the Linux kernel Netfilter nftables subsystem, in nf_tables function nft_chain_lookup_byid(). The function did not validate that a chain identified by ID was active for the applicable generation mask. Consequently, an nftables batch transaction could delete a chain and subsequently create a rule that references the now-inactive chain by its ID. The stale reference can survive transaction processing and, through a race between rule deletion/transaction abort handling and asynchronous transaction-destruction work, can reference chain memory after it has been freed. Upstream remediation adds generation-mask validation to chain-by-ID lookup and updates relevant callers so inactive chains cannot be returned or referenced.
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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.
20 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A vulnerability listed as fixed by a SUSE security update affecting kernel-related packages; no further technical detail is provided in the content.
A vulnerability referenced in a SUSE security update advisory; no further technical detail is provided in the content.
Kernel vulnerability referenced in a SUSE security update advisory; no per-CVE technical details are provided in the content.
Use-after-free flaw in the Linux kernel nf_tables nft_chain_lookup_byid() function.
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.