CVE-2025-21648

CVE-2025-21648: vulnerability in Linux

netfilter: conntrack: clamp maximum hashtable size to INT_MAX

Published · Updated

3Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackepss 0.2%
exploitation probability
0.2%top 89% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: clamp maximum hashtable size to INT_MAX Use INT_MAX as maximum size for the conntrack hashtable. Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when resizing hashtable because __GFP_NOWARN is unset. See: 0708a0afe291 ("mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls") Note: hashtable resize is only possible from init_netns.
Affected products
Linux · Linux
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References
https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlhttps://cert-portal.siemens.com/productcert/html/ssa-265688.htmlhttps://git.kernel.org/stable/c/5552b4fd44be3393b930434a7845d8d95a2a3c33https://git.kernel.org/stable/c/a965f7f0ea3ae61b9165bed619d5d6da02c75f80https://git.kernel.org/stable/c/b1b2353d768f1b80cd7fe045a70adee576b9b338https://git.kernel.org/stable/c/b541ba7d1f5a5b7b3e2e22dc9e40e18a7d6dbc13https://git.kernel.org/stable/c/d5807dd1328bbc86e059c5de80d1bbee9d58ca3dhttps://git.kernel.org/stable/c/f559357d035877b9d0dcd273e0ff83e18e1d46aahttps://lists.debian.org/debian-lts-announce/2025/03/msg00001.htmlhttps://lists.debian.org/debian-lts-announce/2025/03/msg00002.html