CVE-2026-74545
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk7th percentile - higher than 7% of all known CVEs
Summary
In the Linux kernel, the rtase driver has a double free of multi-frag skb on DMA map failure. When the head buffer DMA mapping fails after fragments are mapped, the error path frees the skb twice, leading to a crash.
Risk Assessment
Double free can cause system crash or potentially be exploited by a local attacker.
Recommendation
Apply the patch that returns immediately after clearing fragments when the skb owns frags, preventing double free.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: rtase: fix double free of multi-frag skb on DMA map failure In rtase_start_xmit(), when the head buffer DMA mapping fails after rtase_xmit_frags() has mapped all fragments, the error path clears the fragment descriptors with rtase_tx_clear_range(), which frees the skb through the last-frag slot and accounts tx_dropped. Control then falls through to the common error label, which frees the same skb a second time and counts it again. Return right after clearing the fragments when the skb owns frags; the no-frag case still drops through and frees the head skb once.