Vulnerability-Lookup

GHSA-54QR-3H8V-G6XR

Vulnerability from github – Published: 2026-05-27 15:33 – Updated: 2026-05-27 15:33

Details

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.

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-45929"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-27T14:17:08Z",
    "severity": null
  },
  "details": "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.",
  "id": "GHSA-54qr-3h8v-g6xr",
  "modified": "2026-05-27T15:33:17Z",
  "published": "2026-05-27T15:33:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-45929"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3e4fbcb4e078915367ba5576cd70d76dbc970f95"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/442915c96a9bff1c7080e2aedabb1c03faa28d81"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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

Vulnerability from cvelistv5 – Published: 2026-05-27 12:17 – Updated: 2026-05-27 12:17

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

Linux

References

3 references

URL	Tags
https://git.kernel.org/stable/c/3e4fbcb4e07891536…
https://git.kernel.org/stable/c/442915c96a9bff1c7…
https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 08857b5ec5d91d83e69e40a36554a8c7557b7301 , < 3e4fbcb4e078915367ba5576cd70d76dbc970f95 (git) Affected: 08857b5ec5d91d83e69e40a36554a8c7557b7301 , < 442915c96a9bff1c7080e2aedabb1c03faa28d81 (git) Affected: 08857b5ec5d91d83e69e40a36554a8c7557b7301 , < a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41 (git)
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)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ovpn/io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3e4fbcb4e078915367ba5576cd70d76dbc970f95",
              "status": "affected",
              "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
              "versionType": "git"
            },
            {
              "lessThan": "442915c96a9bff1c7080e2aedabb1c03faa28d81",
              "status": "affected",
              "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
              "versionType": "git"
            },
            {
              "lessThan": "a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41",
              "status": "affected",
              "version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ovpn/io.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.14",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.14",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.4",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.16",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3e4fbcb4e078915367ba5576cd70d76dbc970f95"
        },
        {
          "url": "https://git.kernel.org/stable/c/442915c96a9bff1c7080e2aedabb1c03faa28d81"
        },
        {
          "url": "https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41"
        }
      ],
      "title": "ovpn: fix possible use-after-free in ovpn_net_xmit",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "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"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-54QR-3H8V-G6XR

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

Tags

Sightings

Nomenclature