159 lines
8.5 KiB
JSON
159 lines
8.5 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-45929",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-05-13T15:03:33.086Z",
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"datePublished": "2026-05-27T12:17:47.891Z",
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"dateUpdated": "2026-08-05T12:28:44.254Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T12:28:44.254Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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 — arranging the skb-sharing reference holder and initiating the transmit — 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/ovpn/io.c"
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],
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"versions": [
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{
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"version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
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"lessThan": "3e4fbcb4e078915367ba5576cd70d76dbc970f95",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
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"lessThan": "442915c96a9bff1c7080e2aedabb1c03faa28d81",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "08857b5ec5d91d83e69e40a36554a8c7557b7301",
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"lessThan": "a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/net/ovpn/io.c"
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],
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"versions": [
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{
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"version": "6.16",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "6.16",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.14",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.19.4",
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"lessThanOrEqual": "6.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.18.14"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "6.19.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "6.16",
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"versionEndExcluding": "7.0"
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}
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]
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/3e4fbcb4e078915367ba5576cd70d76dbc970f95"
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},
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{
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"url": "https://git.kernel.org/stable/c/442915c96a9bff1c7080e2aedabb1c03faa28d81"
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},
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{
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"url": "https://git.kernel.org/stable/c/a5ec7baa44ea3a1d6aa0ca31c0ad82edf9affe41"
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}
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],
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"title": "ovpn: fix possible use-after-free in ovpn_net_xmit",
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}
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} |