CVE-2026-45929

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-45929", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.086Z", "datePublished": "2026-05-27T12:17:47.891Z", "dateUpdated": "2026-08-05T12:28:44.254Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:28:44.254Z"}, "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": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable code is `ovpn_net_xmit`, the netdevice TX path (ndo_start_xmit), triggered by transmitting a packet out the local ovpn tunnel interface; the triggering precondition (a shared skb) is a local TX-side artifact and cannot be induced by a remote peer, whose data flows through the separate RX path.\nAC:L - The attacker controls both sides \u2014 arranging the skb-sharing reference holder and initiating the transmit \u2014 so the use-after-free race is within their control; choosing the higher-severity value where exploitation reliability is uncertain.\nPR:L - Creating an ovpn device and establishing the shared-skb condition requires CAP_NET_ADMIN/CAP_NET_RAW, which an unprivileged user can obtain inside a user namespace (unshare -Urn), so this is Low rather than High.\nUI:N - The bug is triggered purely by transmitting packets through the interface; no victim action is required.\nS:U - The use-after-free is contained within the kernel's own security authority and does not cross into a different security scope such as a VM or IOMMU boundary.\nC:H - A use-after-free read of the freed skb (protocol, data, len) lets an attacker who controls the reclaimed object contents read sensitive kernel memory.\nI:H - The use-after-free can be leveraged via heap grooming of the freed skb to corrupt kernel state and achieve write/control-flow primitives.\nA:H - Dereferencing the freed skb readily causes a kernel oops/panic, a full 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/io.c"], "versions": [{"version": "08857b5ec5d91d83e69e40a36554a8c7557b7301", "lessThan": "3e4fbcb4e078915367ba5576cd70d76dbc970f95", "status": "affected", "versionType": "git"}, {"version": "08857b5ec5d91d83e69e40a36554a8c7557b7301", "lessThan": "442915c96a9bff1c7080e2aedabb1c03faa28d81", "status": "affected", "versionType": "git"}, {"version": "08857b5ec5d91d83e69e40a36554a8c7557b7301", "lessThan": "a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41", "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/io.c"], "versions": [{"version": "6.16", "status": "affected"}, {"version": "0", "lessThan": "6.16", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.14", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.4", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.18.14"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "6.19.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.16", "versionEndExcluding": "7.0"}]}]}], "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"}}}}

{}

{"affected": [{"affectedData": [{"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"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "974ECCCC-3CBB-4A66-9A34-82621077D7F4", "versionEndExcluding": "6.18.14", "versionStartIncluding": "6.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "672A3E79-EC03-479D-8503-361DFBDC8092", "versionEndExcluding": "6.19.4", "versionStartIncluding": "6.19", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "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."}], "id": "CVE-2026-45929", "lastModified": "2026-06-25T12:43:33.257", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-05-27T14:17:08.833", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3e4fbcb4e078915367ba5576cd70d76dbc970f95"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/442915c96a9bff1c7080e2aedabb1c03faa28d81"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Undergoing Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: ovpn: fix possible use-after-free in ovpn_net_xmit", "id": "2482047", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482047"}, "csaw": false, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's `ovpn` module. A use-after-free vulnerability exists in the `ovpn_net_xmit` function where a freed `skb` (socket buffer) pointer can be used for subsequent operations. This can occur when `skb_share_check` frees the original `skb` if it is shared, leading to a stale pointer being used. This flaw could potentially lead to system instability, denial of service, or other unspecified impacts."], "name": "CVE-2026-45929", "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"}], "public_date": "2026-05-27T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-45929\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-45929\nhttps://lore.kernel.org/linux-cve-announce/2026052726-CVE-2026-45929-609a@gregkh/T"]}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08857b5ec5d91d83e69e40a36554a8c7557b7301,3e4fbcb4e078915367ba5576cd70d76dbc970f95)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08857b5ec5d91d83e69e40a36554a8c7557b7301,442915c96a9bff1c7080e2aedabb1c03faa28d81)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[08857b5ec5d91d83e69e40a36554a8c7557b7301,a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41)"}}], "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": "generic", "value": "[6.18.14,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.19.4,6.19.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.0,*]"}}], "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": "2026-05-27T16:30:36.646318+00:00", "updated": "2026-08-12T03:00:11.125931+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416", "CWE-825"]}