{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2021-47082", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47082", "idYear": 2021, "status": "PUBLISHED", "publishedAt": "2024-03-04T18:06:17.081Z", "updatedAt": "2026-08-05T08:45:53.877Z", "importedAt": "2026-10-24T01:56:36.661Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "tun: avoid double free in tun_free_netdev", "summary": "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\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", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "662ca437e714caaab855b12415d6ffd815985bc0", "status": "affected", "versionType": "git", "lessThan": "8eb43d635950e27c29f1e9e49a23b31637f37757" }, { "version": "662ca437e714caaab855b12415d6ffd815985bc0", "status": "affected", "versionType": "git", "lessThan": "0c0e566f0387490d16f166808c72e9c772027681" }, { "version": "662ca437e714caaab855b12415d6ffd815985bc0", "status": "affected", "versionType": "git", "lessThan": "a01a4e9f5dc93335c716fa4023b1901956e8c904" }, { "version": "662ca437e714caaab855b12415d6ffd815985bc0", "status": "affected", "versionType": "git", "lessThan": "3cb5ae77799e8ed6ec3fec0b6b4cd07f01650cc5" }, { "version": "662ca437e714caaab855b12415d6ffd815985bc0", "status": "affected", "versionType": "git", "lessThan": "158b515f703e75e7d68289bf4d98c664e1d632df" }, { "version": "a81a02460bdf054ca0c60c5aed29941f7134092d", "status": "affected", "versionType": "git" }, { "version": "6fc265f7a86d81e052508d03da555188f5882c3e", "status": "affected", "versionType": "git" }, { "version": "3.10.16", "status": "affected", "versionType": "semver", "lessThan": "3.11" }, { "version": "3.11.5", "status": "affected", "versionType": "semver", "lessThan": "3.12" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.12", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.12" }, { "version": "4.19.280", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.240", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.136", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.12", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "5.16", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }