240 lines
12 KiB
JSON
240 lines
12 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-2026-74543",
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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": "2026-08-15T05:44:03.914Z",
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"datePublished": "2026-08-15T12:27:53.336Z",
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"dateUpdated": "2026-11-06T17:05:47.895Z"
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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": "2026-10-30T12:30:08.864Z"
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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\nnet: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()\n\nsyzbot reported a memory leak [1] in the UDP tunnel NIC offload code.\n\nWhen device registration fails (e.g. in register_netdevice()), netdev core\nunwinds by sending a single NETDEV_UNREGISTER notification. If work was queued\nduring NETDEV_REGISTER (utn->work_pending is set), udp_tunnel_nic_unregister()\nreturns early:\n\n\tif (utn->work_pending)\n\t\treturn;\n\nBecause failed registrations do not enter netdev_wait_allrefs_any(), no\nsubsequent NETDEV_UNREGISTER rebroadcast will ever occur. As a result, the\nstruct udp_tunnel_nic allocated in udp_tunnel_nic_alloc() is leaked\npermanently.\n\nFix this by removing the early return. Instead, synchronously cancel any\npending work with cancel_delayed_work_sync() before freeing @utn.\n\nTo be able to call cancel_delayed_work_sync() while holding RTNL (the work also\nneeds RTNL), switch udp_tunnel_nic_device_sync_work() to rtnl_trylock(). If RTNL\nis contended, requeue the work with a 1 jiffy delay (via queue_delayed_work())\nto prevent high CPU contention while waiting for RTNL lock.\n\nThe utn->work_pending bookkeeping is no longer needed and is removed, as\nthe workqueue core already tracks the pending/running state of the work.\n\n[1]\nBUG: memory leak\nunreferenced object 0xffff888127d5f840 (size 96):\n comm \"syz-executor\", pid 5806, jiffies 4294942188\n backtrace (crc 99fdb6c8):\n __kmalloc_noprof+0x3bf/0x550\n udp_tunnel_nic_alloc net/ipv4/udp_tunnel_nic.c:756 [inline]\n udp_tunnel_nic_register net/ipv4/udp_tunnel_nic.c:833 [inline]\n udp_tunnel_nic_netdevice_event+0x804/0xab0 net/ipv4/udp_tunnel_nic.c:931\n notifier_call_chain+0x59/0x160 kernel/notifier.c:85\n call_netdevice_notifiers_info+0x7d/0xb0 net/core/dev.c:2250\n register_netdevice+0xc10/0xeb0 net/core/dev.c:11478"
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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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"net/ipv4/udp_tunnel_nic.c"
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],
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"versions": [
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{
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"version": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
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"lessThan": "d53a8b927ac9788257266e115d4901ec6f455387",
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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": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
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"lessThan": "52c753b46265243406690d980faa9514d3f53827",
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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": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
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"lessThan": "b712da45bd9b9835d132e9fbc0c3e43c164cb1fd",
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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": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
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"lessThan": "f82a2ded3d7a9098267c84f14eafdb98c4550ac5",
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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": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
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"lessThan": "b322532a4b774db1b480a2de84125910a70739a5",
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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": "cc4e3835eff474aa274d6e1d18f69d9d296d3b76",
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"lessThan": "080695e6f005e2396f1207fd69d24c442cb230c6",
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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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"net/ipv4/udp_tunnel_nic.c"
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],
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"versions": [
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{
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"version": "5.9",
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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": "5.9",
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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": "6.1.191",
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"lessThanOrEqual": "6.1.*",
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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": "6.6.160",
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"lessThanOrEqual": "6.6.*",
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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": "6.12.103",
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"lessThanOrEqual": "6.12.*",
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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": "6.18.44",
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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": "7.1.8",
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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": "5.9",
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"versionEndExcluding": "6.1.191"
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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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"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/d53a8b927ac9788257266e115d4901ec6f455387"
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},
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{
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"url": "https://git.kernel.org/stable/c/52c753b46265243406690d980faa9514d3f53827"
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},
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{
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"url": "https://git.kernel.org/stable/c/b712da45bd9b9835d132e9fbc0c3e43c164cb1fd"
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},
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{
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"url": "https://git.kernel.org/stable/c/f82a2ded3d7a9098267c84f14eafdb98c4550ac5"
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},
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{
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"url": "https://git.kernel.org/stable/c/b322532a4b774db1b480a2de84125910a70739a5"
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},
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{
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"url": "https://git.kernel.org/stable/c/080695e6f005e2396f1207fd69d24c442cb230c6"
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}
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],
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"title": "net: udp_tunnel: fix memory leak in udp_tunnel_nic_unregister()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-74543",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-11-06T16:59:05.638527Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-11-06T17:05:47.895Z"
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}
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}
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]
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}
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} |