Bug 2521498 (CVE-2026-74705) - CVE-2026-74705 kernel: udp: fix potential use-after-free in tunnel segmentation
Summary: CVE-2026-74705 kernel: udp: fix potential use-after-free in tunnel segmentation
Keywords:
Status: NEW
Alias: CVE-2026-74705
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-08-22 15:48 UTC by OSIDB Bzimport
Modified: 2026-09-28 08:10 UTC (History)
18 users (show)

Fixed In Version:
Clone Of:
Environment:
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Description OSIDB Bzimport 2026-08-22 15:48:29 UTC 
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the saved UDP header pointer is no longer valid.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.
Comment 1 gkamathe 2026-08-24 13:29:35 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026082236-CVE-2026-74705-49e4@gregkh/T
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