307 lines
16 KiB
JSON
307 lines
16 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-2021-47082",
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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": "2024-02-29T22:33:44.298Z",
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"datePublished": "2024-03-04T18:06:17.081Z",
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"dateUpdated": "2026-08-05T08:45:53.877Z"
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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": "2026-08-05T08:45:53.877Z"
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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\ntun: avoid double free in tun_free_netdev\n\nAvoid double free in tun_free_netdev() by moving the\ndev->tstats and tun->security allocs to a new ndo_init routine\n(tun_net_init()) that will be called by register_netdevice().\nndo_init is paired with the desctructor (tun_free_netdev()),\nso if there's an error in register_netdevice() the destructor\nwill handle the frees.\n\nBUG: KASAN: double-free or invalid-free in selinux_tun_dev_free_security+0x1a/0x20 security/selinux/hooks.c:5605\n\nCPU: 0 PID: 25750 Comm: syz-executor416 Not tainted 5.16.0-rc2-syzk #1\nHardware name: Red Hat KVM, BIOS\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0x89/0xb5 lib/dump_stack.c:106\nprint_address_description.constprop.9+0x28/0x160 mm/kasan/report.c:247\nkasan_report_invalid_free+0x55/0x80 mm/kasan/report.c:372\n____kasan_slab_free mm/kasan/common.c:346 [inline]\n__kasan_slab_free+0x107/0x120 mm/kasan/common.c:374\nkasan_slab_free include/linux/kasan.h:235 [inline]\nslab_free_hook mm/slub.c:1723 [inline]\nslab_free_freelist_hook mm/slub.c:1749 [inline]\nslab_free mm/slub.c:3513 [inline]\nkfree+0xac/0x2d0 mm/slub.c:4561\nselinux_tun_dev_free_security+0x1a/0x20 security/selinux/hooks.c:5605\nsecurity_tun_dev_free_security+0x4f/0x90 security/security.c:2342\ntun_free_netdev+0xe6/0x150 drivers/net/tun.c:2215\nnetdev_run_todo+0x4df/0x840 net/core/dev.c:10627\nrtnl_unlock+0x13/0x20 net/core/rtnetlink.c:112\n__tun_chr_ioctl+0x80c/0x2870 drivers/net/tun.c:3302\ntun_chr_ioctl+0x2f/0x40 drivers/net/tun.c:3311\nvfs_ioctl fs/ioctl.c:51 [inline]\n__do_sys_ioctl fs/ioctl.c:874 [inline]\n__se_sys_ioctl fs/ioctl.c:860 [inline]\n__x64_sys_ioctl+0x19d/0x220 fs/ioctl.c:860\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x3a/0x80 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x44/0xae"
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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 vulnerability is triggered via TUNSETIFF ioctl on /dev/net/tun during local tun/tap device creation in tun_set_iff(); it is not reachable from network packets or adjacent-link protocols.\nAC:L - An attacker who can create tun devices can reliably force register_netdevice() to fail after NETDEV_REGISTER (e.g., by inducing memory pressure so ipv6_add_dev/devmap notifiers return errors), hitting the broken err_detach cleanup; no race or layout outside attacker influence is required.\nPR:L - Creating a new tun/tap device only requires ns_capable(net->user_ns, CAP_NET_ADMIN), which an unprivileged user obtains via user+net namespaces (unshare -Urn); /dev/net/tun itself is typically world-openable.\nUI:N - Exploitation needs only attacker-controlled open/ioctl syscalls on /dev/net/tun; no victim action is required.\nS:U - Impact is confined to the local kernel privilege boundary (standard local memory-corruption privilege escalation); this is not a VM escape, IOMMU bypass, or other cross-authority boundary.\nC:H - The bug double-frees kernel heap objects (SELinux tun security blob and/or percpu tstats) on the register_netdevice failure path, enabling heap reuse and arbitrary kernel read primitives.\nI:H - The same double-free of tun->security and/or dev->tstats is classic heap corruption that can be turned into arbitrary write and control-flow hijacking in the kernel.\nA:H - The double-free is reported by KASAN as an invalid free in tun_free_netdev via netdev_run_todo and can oops/panic the kernel even without full exploitation."
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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/tun.c"
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],
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{
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"version": "662ca437e714caaab855b12415d6ffd815985bc0",
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"lessThan": "8eb43d635950e27c29f1e9e49a23b31637f37757",
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"status": "affected",
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"lessThan": "0c0e566f0387490d16f166808c72e9c772027681",
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"status": "affected",
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"lessThan": "158b515f703e75e7d68289bf4d98c664e1d632df",
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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": "a81a02460bdf054ca0c60c5aed29941f7134092d",
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"status": "affected",
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{
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"status": "affected",
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"lessThan": "3.12",
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}
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{
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"programFiles": [
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"drivers/net/tun.c"
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],
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"version": "0",
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"version": "4.19.280",
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},
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{
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"version": "5.4.240",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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},
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{
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"version": "5.10.136",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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},
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{
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"version": "5.15.12",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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{
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"version": "5.16",
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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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