CVE-2022-49014

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-49014", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-22T01:27:53.645Z", "datePublished": "2024-10-21T20:06:24.020Z", "dateUpdated": "2026-08-05T08:53:25.973Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:25.973Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: Fix use-after-free in tun_detach()\n\nsyzbot reported use-after-free in tun_detach() [1]. This causes call\ntrace like below:\n\n==================================================================\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\n\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x15e/0x461 mm/kasan/report.c:395\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\n tun_detach drivers/net/tun.c:704 [inline]\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\n __fput+0x27c/0xa90 fs/file_table.c:320\n task_work_run+0x16f/0x270 kernel/task_work.c:179\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe cause of the issue is that sock_put() from __tun_detach() drops\nlast reference count for struct net, and then notifier_call_chain()\nfrom netdev_state_change() accesses that struct net.\n\nThis patch fixes the issue by calling sock_put() from tun_detach()\nafter all necessary accesses for the struct net has done."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached by opening /dev/net/tun, attaching via TUNSETIFF, then closing the fd (tun_chr_close \u2192 tun_detach); this is a local char-dev/ioctl path, not remote packet processing.\nAC:L - An attacker who creates a dedicated netns, attaches a non-persistent TUN, and exits deterministically drops the last struct net ref via sock_put while netdev_run_todo sleeps in netdev_wait_allrefs, so cleanup_net frees the net before notifier_call_chain runs; syzbot hit this repeatedly with no attacker-uncontrollable condition.\nPR:L - Creating a TUN device requires only ns_capable(net->user_ns, CAP_NET_ADMIN), which an unprivileged user obtains via user+net namespaces (unshare -Urn); /dev/net/tun is world-accessible and syzbot reproduced via unshare/copy_net_ns.\nUI:N - The attacker opens the TUN device, configures it, and exits entirely on their own; no victim action is required.\nS:U - This is a standard in-kernel use-after-free enabling local privilege escalation within the same kernel security authority, with no VM escape or IOMMU/sandbox boundary crossing.\nC:H - The UAF frees a ~6.7KB struct net slab object that is later read in notifier_call_chain via net->netdev_chain; reclaiming that object enables arbitrary kernel memory disclosure.\nI:H - Reclaiming the freed net_namespace object lets an attacker control the notifier chain walked by notifier_call_chain, yielding function-pointer hijack and arbitrary write/code-execution primitives.\nA:H - Any use-after-free is scored A:H; accessing the freed struct net during netdev unregister notifiers can oops/panic the kernel even without a full exploit."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/tun.c"], "versions": [{"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "1f23f1890d91812c35d32eab1b49621b6d32dc7b", "status": "affected", "versionType": "git"}, {"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "16c244bc65d1175775325ec0489a5a5c830e02c7", "status": "affected", "versionType": "git"}, {"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "5f442e1d403e0496bacb74a58e2be7f500695e6f", "status": "affected", "versionType": "git"}, {"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "04b995e963229501401810dab89dc73e7f12d054", "status": "affected", "versionType": "git"}, {"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "4cde8da2d814a3b7b176db81922d4ddaad7c0f0e", "status": "affected", "versionType": "git"}, {"version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "5daadc86f27ea4d691e2131c04310d0418c6cd12", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/net/tun.c"], "versions": [{"version": "4.17", "status": "affected"}, {"version": "0", "lessThan": "4.17", "status": "unaffected", "versionType": "semver"}, {"version": "4.19.268", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.226", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.158", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.82", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.0.12", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "4.19.268"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.4.226"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.10.158"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "5.15.82"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.0.12"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.17", "versionEndExcluding": "6.1"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/1f23f1890d91812c35d32eab1b49621b6d32dc7b"}, {"url": "https://git.kernel.org/stable/c/16c244bc65d1175775325ec0489a5a5c830e02c7"}, {"url": "https://git.kernel.org/stable/c/5f442e1d403e0496bacb74a58e2be7f500695e6f"}, {"url": "https://git.kernel.org/stable/c/04b995e963229501401810dab89dc73e7f12d054"}, {"url": "https://git.kernel.org/stable/c/4cde8da2d814a3b7b176db81922d4ddaad7c0f0e"}, {"url": "https://git.kernel.org/stable/c/5daadc86f27ea4d691e2131c04310d0418c6cd12"}], "title": "net: tun: Fix use-after-free in tun_detach()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-49014", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:13:28.883740Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:18:38.243Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2022-49014", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-10-22T13:13:28.883740Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-22T13:13:32.032Z"}}], "cna": {"title": "net: tun: Fix use-after-free in tun_detach()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The bug is reached by opening /dev/net/tun, attaching via TUNSETIFF, then closing the fd (tun_chr_close \u2192 tun_detach); this is a local char-dev/ioctl path, not remote packet processing.\nAC:L - An attacker who creates a dedicated netns, attaches a non-persistent TUN, and exits deterministically drops the last struct net ref via sock_put while netdev_run_todo sleeps in netdev_wait_allrefs, so cleanup_net frees the net before notifier_call_chain runs; syzbot hit this repeatedly with no attacker-uncontrollable condition.\nPR:L - Creating a TUN device requires only ns_capable(net->user_ns, CAP_NET_ADMIN), which an unprivileged user obtains via user+net namespaces (unshare -Urn); /dev/net/tun is world-accessible and syzbot reproduced via unshare/copy_net_ns.\nUI:N - The attacker opens the TUN device, configures it, and exits entirely on their own; no victim action is required.\nS:U - This is a standard in-kernel use-after-free enabling local privilege escalation within the same kernel security authority, with no VM escape or IOMMU/sandbox boundary crossing.\nC:H - The UAF frees a ~6.7KB struct net slab object that is later read in notifier_call_chain via net->netdev_chain; reclaiming that object enables arbitrary kernel memory disclosure.\nI:H - Reclaiming the freed net_namespace object lets an attacker control the notifier chain walked by notifier_call_chain, yielding function-pointer hijack and arbitrary write/code-execution primitives.\nA:H - Any use-after-free is scored A:H; accessing the freed struct net during netdev unregister notifiers can oops/panic the kernel even without a full exploit."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "1f23f1890d91812c35d32eab1b49621b6d32dc7b", "versionType": "git"}, {"status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "16c244bc65d1175775325ec0489a5a5c830e02c7", "versionType": "git"}, {"status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "5f442e1d403e0496bacb74a58e2be7f500695e6f", "versionType": "git"}, {"status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "04b995e963229501401810dab89dc73e7f12d054", "versionType": "git"}, {"status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "4cde8da2d814a3b7b176db81922d4ddaad7c0f0e", "versionType": "git"}, {"status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "lessThan": "5daadc86f27ea4d691e2131c04310d0418c6cd12", "versionType": "git"}], "programFiles": ["drivers/net/tun.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"status": "unaffected", "version": "0", "lessThan": "4.17", "versionType": "semver"}, {"status": "unaffected", "version": "4.19.268", "versionType": "semver", "lessThanOrEqual": "4.19.*"}, {"status": "unaffected", "version": "5.4.226", "versionType": "semver", "lessThanOrEqual": "5.4.*"}, {"status": "unaffected", "version": "5.10.158", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.82", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.0.12", "versionType": "semver", "lessThanOrEqual": "6.0.*"}, {"status": "unaffected", "version": "6.1", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["drivers/net/tun.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/1f23f1890d91812c35d32eab1b49621b6d32dc7b"}, {"url": "https://git.kernel.org/stable/c/16c244bc65d1175775325ec0489a5a5c830e02c7"}, {"url": "https://git.kernel.org/stable/c/5f442e1d403e0496bacb74a58e2be7f500695e6f"}, {"url": "https://git.kernel.org/stable/c/04b995e963229501401810dab89dc73e7f12d054"}, {"url": "https://git.kernel.org/stable/c/4cde8da2d814a3b7b176db81922d4ddaad7c0f0e"}, {"url": "https://git.kernel.org/stable/c/5daadc86f27ea4d691e2131c04310d0418c6cd12"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: Fix use-after-free in tun_detach()\n\nsyzbot reported use-after-free in tun_detach() [1]. This causes call\ntrace like below:\n\n==================================================================\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\n\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x15e/0x461 mm/kasan/report.c:395\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\n tun_detach drivers/net/tun.c:704 [inline]\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\n __fput+0x27c/0xa90 fs/file_table.c:320\n task_work_run+0x16f/0x270 kernel/task_work.c:179\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe cause of the issue is that sock_put() from __tun_detach() drops\nlast reference count for struct net, and then notifier_call_chain()\nfrom netdev_state_change() accesses that struct net.\n\nThis patch fixes the issue by calling sock_put() from tun_detach()\nafter all necessary accesses for the struct net has done."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "4.19.268", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.226", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.158", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.82", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.0.12", "versionStartIncluding": "4.17"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1", "versionStartIncluding": "4.17"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:53:25.973Z"}}}, "cveMetadata": {"cveId": "CVE-2022-49014", "state": "PUBLISHED", "dateUpdated": "2026-08-05T08:53:25.973Z", "dateReserved": "2024-08-22T01:27:53.645Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2024-10-21T20:06:24.020Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/net/tun.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "1f23f1890d91812c35d32eab1b49621b6d32dc7b", "status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "versionType": "git"}, {"lessThan": "16c244bc65d1175775325ec0489a5a5c830e02c7", "status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "versionType": "git"}, {"lessThan": "5f442e1d403e0496bacb74a58e2be7f500695e6f", "status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "versionType": "git"}, {"lessThan": "04b995e963229501401810dab89dc73e7f12d054", "status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "versionType": "git"}, {"lessThan": "4cde8da2d814a3b7b176db81922d4ddaad7c0f0e", "status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "versionType": "git"}, {"lessThan": "5daadc86f27ea4d691e2131c04310d0418c6cd12", "status": "affected", "version": "83c1f36f9880814b24cdf6c2f91f66f61db65326", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/net/tun.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.17"}, {"lessThan": "4.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "4.19.*", "status": "unaffected", "version": "4.19.268", "versionType": "semver"}, {"lessThanOrEqual": "5.4.*", "status": "unaffected", "version": "5.4.226", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.158", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.82", "versionType": "semver"}, {"lessThanOrEqual": "6.0.*", "status": "unaffected", "version": "6.0.12", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "6.1", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "F418A145-8A14-43A0-823E-F1C684FB9825", "versionEndExcluding": "4.19.268", "versionStartIncluding": "4.17", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "274F5087-5805-4D03-8C74-8517300658F1", "versionEndExcluding": "5.4.226", "versionStartIncluding": "4.20", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D0FB1AF1-0A0B-4419-B25F-C61F17380E18", "versionEndExcluding": "5.10.158", "versionStartIncluding": "5.5", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "0DC20DB6-73C1-4465-B931-117BFB8EBB02", "versionEndExcluding": "5.15.82", "versionStartIncluding": "5.11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "D6D56E90-F3EE-413D-B3E2-B518932F0C7D", "versionEndExcluding": "6.0.12", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*", "matchCriteriaId": "E7E331DA-1FB0-4DEC-91AC-7DA69D461C11", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*", "matchCriteriaId": "17F0B248-42CF-4AE6-A469-BB1BAE7F4705", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*", "matchCriteriaId": "E2422816-0C14-4B5E-A1E6-A9D776E5C49B", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc4:*:*:*:*:*:*", "matchCriteriaId": "1C6E00FE-5FB9-4D20-A1A1-5A32128F9B76", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc5:*:*:*:*:*:*", "matchCriteriaId": "35B26BE4-43A6-4A36-A7F6-5B3F572D9186", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc6:*:*:*:*:*:*", "matchCriteriaId": "3FFFB0B3-930D-408A-91E2-BAE0C2715D80", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.1:rc7:*:*:*:*:*:*", "matchCriteriaId": "8535320E-A0DB-4277-800E-D0CE5BBA59E8", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: tun: Fix use-after-free in tun_detach()\n\nsyzbot reported use-after-free in tun_detach() [1]. This causes call\ntrace like below:\n\n==================================================================\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\n\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:284 [inline]\n print_report+0x15e/0x461 mm/kasan/report.c:395\n kasan_report+0xbf/0x1f0 mm/kasan/report.c:495\n notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\n call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\n call_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\n call_netdevice_notifiers net/core/dev.c:1997 [inline]\n netdev_wait_allrefs_any net/core/dev.c:10237 [inline]\n netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\n tun_detach drivers/net/tun.c:704 [inline]\n tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\n __fput+0x27c/0xa90 fs/file_table.c:320\n task_work_run+0x16f/0x270 kernel/task_work.c:179\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0xb3d/0x2a30 kernel/exit.c:820\n do_group_exit+0xd4/0x2a0 kernel/exit.c:950\n get_signal+0x21b1/0x2440 kernel/signal.c:2858\n arch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\n exit_to_user_mode_loop kernel/entry/common.c:168 [inline]\n exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\n __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\n syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\n do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe cause of the issue is that sock_put() from __tun_detach() drops\nlast reference count for struct net, and then notifier_call_chain()\nfrom netdev_state_change() accesses that struct net.\n\nThis patch fixes the issue by calling sock_put() from tun_detach()\nafter all necessary accesses for the struct net has done."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: tun: Se corrige el use after free en tun_detach() syzbot inform\u00f3 use after free en tun_detach() [1]. Esto provoca un seguimiento de llamadas como el siguiente: ==================================================================== ERROR: KASAN: use after free en notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff88807324e2a8 por la tarea syz-executor.0/3673 CPU: 0 PID: 3673 Comm: syz-executor.0 No contaminado 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 26/10/2022 Seguimiento de llamadas: __dump_stack lib/dump_stack.c:88 [en l\u00ednea] dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106 print_address_description mm/kasan/report.c:284 [en l\u00ednea] print_report+0x15e/0x461 mm/kasan/report.c:395 kasan_report+0xbf/0x1f0 mm/kasan/report.c:495 notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75 call_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942 call_netdevice_notifiers_extack net/core/dev.c:1983 [en l\u00ednea] llamar_notificadores_dispositivos_de_red net/core/dev.c:1997 [en l\u00ednea] netdev_wait_allrefs_any net/core/dev.c:10237 [en l\u00ednea] netdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351 tun_detach drivers/net/tun.c:704 [en l\u00ednea] tun_chr_close+0xe4/0x190 drivers/net/tun.c:3467 __fput+0x27c/0xa90 fs/file_table.c:320 tarea_trabajo_ejecutar+0x16f/0x270 kernel/tarea_trabajo.c:179 salir_tarea_trabajo incluir/linux/tarea_trabajo.h:38 [en l\u00ednea] hacer_salir+0xb3d/0x2a30 kernel/exit.c:820 hacer_grupo_salir+0xd4/0x2a0 kernel/exit.c:950 obtener_se\u00f1al+0x21b1/0x2440 kernel/se\u00f1al.c:2858 arch_hacer_se\u00f1al_o_reiniciar+0x86/0x2300 arch/x86/kernel/signal.c:869 bucle_salir_a_modo_usuario kernel/entry/common.c:168 [en l\u00ednea] preparar_salir_a_modo_usuario+0x15f/0x250 kernel/entry/common.c:203 __syscall_salir_a_modo_usuario_trabajo kernel/entry/common.c:285 [en l\u00ednea] syscall_salir_a_modo_usuario+0x1d/0x50 kernel/entry/common.c:296 La causa del problema es que sock_put() de __tun_detach() descarta el \u00faltimo recuento de referencias para struct net y luego notifier_call_chain() de netdev_state_change() accede a ese struct net. Este parche corrige el problema llamando a sock_put() desde tun_detach() despu\u00e9s de que se hayan realizado todos los accesos necesarios para struct net."}], "id": "CVE-2022-49014", "lastModified": "2026-08-04T10:17:30.860", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-49014", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-10-22T13:13:28.883740Z", "version": "2.0.3"}}]}, "published": "2024-10-21T20:15:12.707", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/04b995e963229501401810dab89dc73e7f12d054"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/16c244bc65d1175775325ec0489a5a5c830e02c7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/1f23f1890d91812c35d32eab1b49621b6d32dc7b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4cde8da2d814a3b7b176db81922d4ddaad7c0f0e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5daadc86f27ea4d691e2131c04310d0418c6cd12"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5f442e1d403e0496bacb74a58e2be7f500695e6f"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2025:6966", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}, {"advisory": "RHSA-2025:6966", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-570.12.1.el9_6", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2025-05-13T00:00:00Z"}], "bugzilla": {"description": "kernel: net: tun: Fix use-after-free in tun_detach()", "id": "2320670", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2320670"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.7", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet: tun: Fix use-after-free in tun_detach()\nsyzbot reported use-after-free in tun_detach() [1]. This causes call\ntrace like below:\n==================================================================\nBUG: KASAN: use-after-free in notifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\nRead of size 8 at addr ffff88807324e2a8 by task syz-executor.0/3673\nCPU: 0 PID: 3673 Comm: syz-executor.0 Not tainted 6.1.0-rc5-syzkaller-00044-gcc675d22e422 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n<TASK>\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:284 [inline]\nprint_report+0x15e/0x461 mm/kasan/report.c:395\nkasan_report+0xbf/0x1f0 mm/kasan/report.c:495\nnotifier_call_chain+0x1ee/0x200 kernel/notifier.c:75\ncall_netdevice_notifiers_info+0x86/0x130 net/core/dev.c:1942\ncall_netdevice_notifiers_extack net/core/dev.c:1983 [inline]\ncall_netdevice_notifiers net/core/dev.c:1997 [inline]\nnetdev_wait_allrefs_any net/core/dev.c:10237 [inline]\nnetdev_run_todo+0xbc6/0x1100 net/core/dev.c:10351\ntun_detach drivers/net/tun.c:704 [inline]\ntun_chr_close+0xe4/0x190 drivers/net/tun.c:3467\n__fput+0x27c/0xa90 fs/file_table.c:320\ntask_work_run+0x16f/0x270 kernel/task_work.c:179\nexit_task_work include/linux/task_work.h:38 [inline]\ndo_exit+0xb3d/0x2a30 kernel/exit.c:820\ndo_group_exit+0xd4/0x2a0 kernel/exit.c:950\nget_signal+0x21b1/0x2440 kernel/signal.c:2858\narch_do_signal_or_restart+0x86/0x2300 arch/x86/kernel/signal.c:869\nexit_to_user_mode_loop kernel/entry/common.c:168 [inline]\nexit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203\n__syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline]\nsyscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296\ndo_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\nThe cause of the issue is that sock_put() from __tun_detach() drops\nlast reference count for struct net, and then notifier_call_chain()\nfrom netdev_state_change() accesses that struct net.\nThis patch fixes the issue by calling sock_put() from tun_detach()\nafter all necessary accesses for the struct net has done."], "name": "CVE-2022-49014", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-10-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49014\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49014\nhttps://lore.kernel.org/linux-cve-announce/2024102153-CVE-2022-49014-1627@gregkh/T"], "statement": "This issue is considered to be a moderate impact flaw, as the exploitation for this will need an ADMIN (or ROOT) privilege (PR:H) in drivers/net/tun.c.", "threat_severity": "Moderate"}

{}