CVE-2026-68341

In the Linux kernel, the following vulnerability has been resolved: ovpn: fix use after free in unlock_ovpn() unlock_ovpn() iterates over the release_list using llist_for_each_entry() and drops the peer reference inside the loop body via ovpn_peer_put(). If this drops the last reference, the peer is eventually freed. However, llist_for_each_entry() reads peer->release_entry.next in the loop advance expression, which runs after the body. By that time the peer may have already been freed, resulting in a use after free when advancing to the next list entry. Fix this by using llist_for_each_entry_safe(), which caches the next pointer before executing the loop body.

CVSS v3 8.8 HIGH

8.8^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.9

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/stable/c/4cdb209f12a89c5faf9be0c45edb90ccdf65db0c
https://git.kernel.org/stable/c/5b96227c0e8b212b74838424c929fc889aedb555
https://git.kernel.org/stable/c/e1ad6fe5db719874efa45b2caf9934552e09fc43

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-10 13:20

Updated : 2026-08-17 06:17

NVD link : CVE-2026-68341

Mitre link : CVE-2026-68341

CVE.ORG link : CVE-2026-68341

JSON object : View

Products Affected

No product.

CWE

No CWE.

{"id": "CVE-2026-68341", "cveTags": [], "metrics": {"cvssMetricV31": [{"type": "Secondary", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 8.8, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH"}, "impactScore": 5.9, "exploitabilityScore": 2.8}]}, "affected": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "affectedData": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "lessThan": "5b96227c0e8b212b74838424c929fc889aedb555", "versionType": "git"}, {"status": "affected", "version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "lessThan": "4cdb209f12a89c5faf9be0c45edb90ccdf65db0c", "versionType": "git"}, {"status": "affected", "version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "lessThan": "e1ad6fe5db719874efa45b2caf9934552e09fc43", "versionType": "git"}], "programFiles": ["drivers/net/ovpn/peer.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "6.16"}, {"status": "unaffected", "version": "0", "lessThan": "6.16", "versionType": "semver"}, {"status": "unaffected", "version": "6.18.42", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.6", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/ovpn/peer.c"], "defaultStatus": "affected"}]}], "published": "2026-08-10T13:20:24.613", "references": [{"url": "https://git.kernel.org/stable/c/4cdb209f12a89c5faf9be0c45edb90ccdf65db0c", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/5b96227c0e8b212b74838424c929fc889aedb555", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}, {"url": "https://git.kernel.org/stable/c/e1ad6fe5db719874efa45b2caf9934552e09fc43", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "vulnStatus": "Received", "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\novpn: fix use after free in unlock_ovpn()\n\nunlock_ovpn() iterates over the release_list using llist_for_each_entry()\nand drops the peer reference inside the loop body via ovpn_peer_put().\n\nIf this drops the last reference, the peer is eventually freed. However,\nllist_for_each_entry() reads peer->release_entry.next in the loop advance\nexpression, which runs after the body. By that time the peer may have\nalready been freed, resulting in a use after free when advancing to the\nnext list entry.\n\nFix this by using llist_for_each_entry_safe(), which caches the next\npointer before executing the loop body."}], "lastModified": "2026-08-17T06:17:42.307", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}