CVE-2026-68341

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-68341", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.384Z", "datePublished": "2026-08-10T12:03:17.821Z", "dateUpdated": "2026-08-17T05:03:41.213Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:03:41.213Z"}, "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."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - unlock_ovpn() is reached directly from remote-peer activity: a malformed/aborted OpenVPN TCP stream schedules ovpn_tcp_peer_del_work() -> ovpn_peer_del() (tcp.c:154/287/506), peer disconnect hits ovpn_tcp_close(), and remote peers falling silent make ovpn_peer_keepalive_work() queue peers onto release_list. No local action is needed to enter the vulnerable loop.\nAC:L - The attacker controls both the trigger and its repetition rate: a remote peer can force transport errors, reconnects and keepalive expiries arbitrarily often, and in MP mode can control how many peers land on release_list at once, plus generate traffic-driven allocation pressure to influence slab reuse of the freed ovpn_peer.\nPR:L - The vulnerable loop only runs for peers already installed in the kernel, which the openvpn userspace daemon does for a connected client, so the attacker acts as an established (low-privileged) VPN peer rather than an unauthenticated stranger; no administrative rights on the target are needed.\nUI:N - Peer removal and the subsequent list walk happen automatically inside the kernel's TCP error/close handling and keepalive worker; no administrator or user action on the victim host is required.\nS:U - The use-after-free corrupts kernel heap state within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed ovpn_peer is re-read to obtain the next list pointer, so a reclaimed and re-populated slab object lets the attacker steer the walk onto arbitrary memory that is then dereferenced (peer->sock, peer->refcount), yielding a kernel-memory read primitive and disclosure of sensitive kernel data.\nI:H - Continuing the walk onto a stale/attacker-groomed object causes rcu_replace_pointer() writes, lock_sock() and kref_put() (a controlled decrement plus invocation of a release callback) on a bogus struct ovpn_peer, giving heap-spray-based write and control-flow-hijack potential typical of exploitable UAFs.\nA:H - Dereferencing freed or recycled memory as an ovpn_peer reliably produces oops/panic or slab corruption, taking down the VPN gateway kernel; the path is remotely repeatable, so it is a dependable denial of service."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ovpn/peer.c"], "versions": [{"version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "lessThan": "5b96227c0e8b212b74838424c929fc889aedb555", "status": "affected", "versionType": "git"}, {"version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "lessThan": "4cdb209f12a89c5faf9be0c45edb90ccdf65db0c", "status": "affected", "versionType": "git"}, {"version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "lessThan": "e1ad6fe5db719874efa45b2caf9934552e09fc43", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/ovpn/peer.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.18.42"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.1.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/5b96227c0e8b212b74838424c929fc889aedb555"}, {"url": "https://git.kernel.org/stable/c/4cdb209f12a89c5faf9be0c45edb90ccdf65db0c"}, {"url": "https://git.kernel.org/stable/c/e1ad6fe5db719874efa45b2caf9934552e09fc43"}], "title": "ovpn: fix use after free in unlock_ovpn()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/ovpn/peer.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "5b96227c0e8b212b74838424c929fc889aedb555", "status": "affected", "version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "versionType": "git"}, {"lessThan": "4cdb209f12a89c5faf9be0c45edb90ccdf65db0c", "status": "affected", "version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "versionType": "git"}, {"lessThan": "e1ad6fe5db719874efa45b2caf9934552e09fc43", "status": "affected", "version": "80747caef33d77f5c1b3d24644e6d7dae69066b5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/ovpn/peer.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": "6.18.42", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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."}], "id": "CVE-2026-68341", "lastModified": "2026-08-17T06:17:42.307", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-10T13:20:24.613", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "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"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel: Use-after-free vulnerability in the ovpn module", "id": "2513225", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2513225"}, "csaw": false, "cvss3": {"cvss3_base_score": "4.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["In the Linux kernel, the following vulnerability has been resolved:\novpn: fix use after free in unlock_ovpn()\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().\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.\nFix this by using llist_for_each_entry_safe(), which caches the next\npointer before executing the loop body.", "A flaw was found in the Linux kernel's ovpn module. When the `unlock_ovpn()` function processes a list of objects, it may attempt to access memory that has already been freed. This use-after-free vulnerability could potentially lead to system instability or, in more severe cases, arbitrary code execution."], "name": "CVE-2026-68341", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:enterprise_linux_nvidia:", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux for NVIDIA 26"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-08-10T12:03:17Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-68341\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-68341\nhttps://git.kernel.org/stable/c/4cdb209f12a89c5faf9be0c45edb90ccdf65db0c\nhttps://git.kernel.org/stable/c/5b96227c0e8b212b74838424c929fc889aedb555\nhttps://git.kernel.org/stable/c/e1ad6fe5db719874efa45b2caf9934552e09fc43"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80747caef33d77f5c1b3d24644e6d7dae69066b5,5b96227c0e8b212b74838424c929fc889aedb555)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80747caef33d77f5c1b3d24644e6d7dae69066b5,4cdb209f12a89c5faf9be0c45edb90ccdf65db0c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[80747caef33d77f5c1b3d24644e6d7dae69066b5,e1ad6fe5db719874efa45b2caf9934552e09fc43)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.16"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.16)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.42,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.6,7.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2-rc5,*)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-10T16:00:04.016754+00:00", "updated": "2026-08-14T01:30:04.463081+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}