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-2026-80520",
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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": "2026-08-26T14:34:25.763Z",
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"datePublished": "2026-08-26T14:37:01.983Z",
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"dateUpdated": "2026-08-27T05:01:16.637Z"
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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": "2026-08-27T05:01:16.637Z"
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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 NULL dereference when killing missing key\n\novpn_crypto_kill_key assumes both crypto slots are populated and\ndereferences each slot before checking it. That is not guaranteed: a\npeer can have only one installed key, and the kill path may be asked to\nremove a key that is not present.\n\nRead each slot once while holding the crypto state lock, check for NULL\nbefore looking at key_id, and only replace the slot that actually\nmatches."
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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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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"baseScore": 7.5,
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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:N - The bug is reached from ovpn_encrypt_post during outbound VPN encryption over UDP/TCP; a remote authenticated OpenVPN peer can drive high-volume tunnel traffic that exhausts packet IDs and triggers ovpn_crypto_kill_key on internet-facing VPN concentrators.\nAC:L - After a normal rekey leaves one key in slots[1] with slots[0] NULL, IV exhaustion deterministically calls ovpn_crypto_kill_key and the NULL dereference is reliable; a remote peer can sustain the encrypted traffic needed to reach the 32-bit packet-ID limit.\nPR:N - Exploitation requires only an established OpenVPN data-channel session to an ovpn-offloaded interface, not local shell access, CAP_NET_ADMIN, or init-namespace root; no kernel configuration privileges are needed beyond being a connected VPN peer.\nUI:N - Triggering IV exhaustion and the subsequent key-kill path requires no victim user interaction beyond routine automated VPN traffic and key rotation already performed by the tunnel daemon.\nS:U - Impact is a kernel NULL-pointer fault and denial of service within the kernel network stack; it does not cross a security boundary such as guest-to-host escape or sandbox breakout.\nC:N - This is a pure NULL pointer dereference when reading key_id from an unpopulated crypto slot; it does not expose kernel memory, leak pointers, or provide an arbitrary read primitive.\nI:N - The fault occurs on a NULL slot lookup and does not corrupt memory or enable arbitrary writes, code execution, or control-flow hijacking beyond the immediate crash.\nA:H - The NULL dereference in ovpn_crypto_kill_key causes a kernel oops or panic when IV exhaustion triggers the key-kill path, fully denying service to the host and all VPN peers on that node."
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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/crypto.c"
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],
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"versions": [
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{
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"version": "89d3c0e4612afa1c6429ed68d298e35592fbe208",
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"lessThan": "a47a080d06ee9d94dc6a2da0fc2b9beeeedb92b3",
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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": "89d3c0e4612afa1c6429ed68d298e35592fbe208",
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"lessThan": "acf32a5dff082044cf0fd9492f3c10b7357c15ee",
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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": "89d3c0e4612afa1c6429ed68d298e35592fbe208",
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"lessThan": "41d44ac7a61e2f74453af40d4fe1b82af9ea0ada",
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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/crypto.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": "6.18.46",
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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": "7.1.10",
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"lessThanOrEqual": "7.1.*",
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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": "7.2",
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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": "6.18.46"
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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": "7.1.10"
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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": "7.2"
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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/a47a080d06ee9d94dc6a2da0fc2b9beeeedb92b3"
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},
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{
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"url": "https://git.kernel.org/stable/c/acf32a5dff082044cf0fd9492f3c10b7357c15ee"
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},
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{
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"url": "https://git.kernel.org/stable/c/41d44ac7a61e2f74453af40d4fe1b82af9ea0ada"
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}
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],
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"title": "ovpn: fix NULL dereference when killing missing key",
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"x_generator": {
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}
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}
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} |