CVE-2026-23048
In the Linux kernel, the following vulnerability has been resolved: udp: call skb_orphan() before skb_attempt_defer_free() Standard UDP receive path does not use skb->destructor. But skmsg layer does use it, since it calls skb_set_owner_sk_safe() from udp_read_skb(). This then triggers this warning in skb_attempt_defer_free(): DEBUG_NET_WARN_ON_ONCE(skb->destructor); We must call skb_orphan() to fix this issue.
Affected versions
Linux kernel versions
6.18
and later are affected. Fixed in
6.18.6,
6.19
and their respective stable series.
References
The following references provide additional information about CVE-2026-23048 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/0c63d5683eae6a7b4d81382bcbecb2a19feff90d
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PatchKernel patch commithttps://git.kernel.org/stable/c/e5c8eda39a9fc1547d1398d707aa06c1d080abdd
Frequently asked questions
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What is CVE-2026-23048?
CVE-2026-23048 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.18 onward and has been patched in 6.18.6 and 6.19. CVE-2026-23048 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-23048?
Yes — CVE-2026-23048 has been patched. Fixed versions include 6.18.6 and 6.19. If you are running Linux kernel 6.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-23048 actively exploited?
No — CVE-2026-23048 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.