CVE-2026-43481
HighCVSS 7.8Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
Double-free of reply skb in net_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit() functions. After genlmsg_reply() the skb is managed by netlink, and calling nlmsg_free() again on error leads to double free.
Risk Assessment
Double-free can corrupt kernel structures, potentially allowing an attacker to cause system crash (DoS) or in extreme cases privilege escalation.
Recommendation
Immediately update the Linux kernel to a version containing the fix that removes the redundant nlmsg_free() call after genlmsg_reply().
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: net-shapers: don't free reply skb after genlmsg_reply() genlmsg_reply() hands the reply skb to netlink, and netlink_unicast() consumes it on all return paths, whether the skb is queued successfully or freed on an error path. net_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit() currently jump to free_msg after genlmsg_reply() fails and call nlmsg_free(msg), which can hit the same skb twice. Return the genlmsg_reply() error directly and keep free_msg only for pre-reply failures.