CVE-2026-45929 (GCVE-0-2026-45929)

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17
VLAI
Title
ovpn: fix possible use-after-free in ovpn_net_xmit
Summary
In the Linux kernel, the following vulnerability has been resolved: ovpn: fix possible use-after-free in ovpn_net_xmit When building the skb_list in ovpn_net_xmit, skb_share_check will free the original skb if it is shared. The current implementation continues to use the stale skb pointer for subsequent operations: - peer lookup, - skb_dst_drop (even though all segments produced by skb_gso_segment will have a dst attached), - ovpn_peer_stats_increment_tx. Fix this by moving the peer lookup and skb_dst_drop before segmentation so that the original skb is still valid when used. Return early if all segments fail skb_share_check and the list ends up empty. Also switch ovpn_peer_stats_increment_tx to use skb_list.next; the next patch fixes the stats logic.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 08857b5ec5d91d83e69e40a36554a8c7557b7301 , < 3e4fbcb4e078915367ba5576cd70d76dbc970f95 (git)
Affected: 08857b5ec5d91d83e69e40a36554a8c7557b7301 , < 442915c96a9bff1c7080e2aedabb1c03faa28d81 (git)
Affected: 08857b5ec5d91d83e69e40a36554a8c7557b7301 , < a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41 (git)
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Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.18.14 , ≤ 6.18.* (semver)
Unaffected: 6.19.4 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "product": "Linux",
          "programFiles": [
            "drivers/net/ovpn/io.c"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novpn: fix possible use-after-free in ovpn_net_xmit\n\nWhen building the skb_list in ovpn_net_xmit, skb_share_check will free\nthe original skb if it is shared. The current implementation continues\nto use the stale skb pointer for subsequent operations:\n- peer lookup,\n- skb_dst_drop (even though all segments produced by skb_gso_segment\n  will have a dst attached),\n- ovpn_peer_stats_increment_tx.\n\nFix this by moving the peer lookup and skb_dst_drop before segmentation\nso that the original skb is still valid when used. Return early if all\nsegments fail skb_share_check and the list ends up empty.\nAlso switch ovpn_peer_stats_increment_tx to use skb_list.next; the next\npatch fixes the stats logic."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-27T12:17:47.891Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41"
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      ],
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-45929",
    "datePublished": "2026-05-27T12:17:47.891Z",
    "dateReserved": "2026-05-13T15:03:33.086Z",
    "dateUpdated": "2026-05-27T12:17:47.891Z",
    "state": "PUBLISHED"
  },
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  "vulnerability-lookup:meta": {
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      "date": "2026-05-29",
      "epss": "0.00017",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-45929\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-05-27T14:17:08.833\",\"lastModified\":\"2026-05-27T14:48:03.013\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\novpn: fix possible use-after-free in ovpn_net_xmit\\n\\nWhen building the skb_list in ovpn_net_xmit, skb_share_check will free\\nthe original skb if it is shared. The current implementation continues\\nto use the stale skb pointer for subsequent operations:\\n- peer lookup,\\n- skb_dst_drop (even though all segments produced by skb_gso_segment\\n  will have a dst attached),\\n- ovpn_peer_stats_increment_tx.\\n\\nFix this by moving the peer lookup and skb_dst_drop before segmentation\\nso that the original skb is still valid when used. Return early if all\\nsegments fail skb_share_check and the list ends up empty.\\nAlso switch ovpn_peer_stats_increment_tx to use skb_list.next; the next\\npatch fixes the stats logic.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3e4fbcb4e078915367ba5576cd70d76dbc970f95\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/442915c96a9bff1c7080e2aedabb1c03faa28d81\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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