CVE-2026-23048 (GCVE-0-2026-23048)

Vulnerability from cvelistv5 – Published: 2026-02-04 16:00 – Updated: 2026-02-09 08:37
VLAI?
Title
udp: call skb_orphan() before skb_attempt_defer_free()
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6471658dc66c670580a7616e75f51b52917e7883 , < 0c63d5683eae6a7b4d81382bcbecb2a19feff90d (git)
Affected: 6471658dc66c670580a7616e75f51b52917e7883 , < e5c8eda39a9fc1547d1398d707aa06c1d080abdd (git)
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    Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.6 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: call skb_orphan() before skb_attempt_defer_free()\n\nStandard UDP receive path does not use skb-\u003edestructor.\n\nBut skmsg layer does use it, since it calls skb_set_owner_sk_safe()\nfrom udp_read_skb().\n\nThis then triggers this warning in skb_attempt_defer_free():\n\n    DEBUG_NET_WARN_ON_ONCE(skb-\u003edestructor);\n\nWe must call skb_orphan() to fix this issue."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-02-09T08:37:43.601Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23048",
    "datePublished": "2026-02-04T16:00:30.232Z",
    "dateReserved": "2026-01-13T15:37:45.949Z",
    "dateUpdated": "2026-02-09T08:37:43.601Z",
    "state": "PUBLISHED"
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}


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