CVE-2026-74705
In the Linux kernel, the following vulnerability has been resolved:
udp: fix potential use-after-free in tunnel segmentation
__skb_udp_tunnel_segment() gets the UDP header before ensuring the
tunnel header is in the skb head. If the pull reallocates skb->head,
the saved UDP header pointer is no longer valid.
Get the UDP header after the pull to avoid a potential use-after-free.
CSIRTS triage
- What
- UDP tunnel segmentation contains use-after-free vulnerability in packet processing.
- Who is affected
- Linux systems with UDP tunnel implementations enabled.
- Urgency
- Medium priority; not exploited but risks memory corruption.
- Action
- Apply kernel patch for UDP tunnel segmentation use-after-free fix.
AI-assisted analysis generated from the source advisory — verify against the original.
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Exploitation outlook
- Low exploitation risk0.50% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 41% of all EPSS-scored CVEs.
Advisory coverage (2)
- criticalCVE-2026-74705: In the Linux kernel, the following vulnerability has been resolved: udp: fix potential use-aft…nvd · 2026-08-22
- mediumCVE-2026-74705: udp: fix potential use-after-free in tunnel segmentationmsrc · 2026-08-11
External references
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