| { |
| "containers": { |
| "cna": { |
| "providerMetadata": { |
| "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038" |
| }, |
| "descriptions": [ |
| { |
| "lang": "en", |
| "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: arm64: Unregister redistributor for failed vCPU creation\n\nAlex reports that syzkaller has managed to trigger a use-after-free when\ntearing down a VM:\n\n BUG: KASAN: slab-use-after-free in kvm_put_kvm+0x300/0xe68 virt/kvm/kvm_main.c:5769\n Read of size 8 at addr ffffff801c6890d0 by task syz.3.2219/10758\n\n CPU: 3 UID: 0 PID: 10758 Comm: syz.3.2219 Not tainted 6.11.0-rc6-dirty #64\n Hardware name: linux,dummy-virt (DT)\n Call trace:\n dump_backtrace+0x17c/0x1a8 arch/arm64/kernel/stacktrace.c:317\n show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:324\n __dump_stack lib/dump_stack.c:93 [inline]\n dump_stack_lvl+0x94/0xc0 lib/dump_stack.c:119\n print_report+0x144/0x7a4 mm/kasan/report.c:377\n kasan_report+0xcc/0x128 mm/kasan/report.c:601\n __asan_report_load8_noabort+0x20/0x2c mm/kasan/report_generic.c:381\n kvm_put_kvm+0x300/0xe68 virt/kvm/kvm_main.c:5769\n kvm_vm_release+0x4c/0x60 virt/kvm/kvm_main.c:1409\n __fput+0x198/0x71c fs/file_table.c:422\n ____fput+0x20/0x30 fs/file_table.c:450\n task_work_run+0x1cc/0x23c kernel/task_work.c:228\n do_notify_resume+0x144/0x1a0 include/linux/resume_user_mode.h:50\n el0_svc+0x64/0x68 arch/arm64/kernel/entry-common.c:169\n el0t_64_sync_handler+0x90/0xfc arch/arm64/kernel/entry-common.c:730\n el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:598\n\nUpon closer inspection, it appears that we do not properly tear down the\nMMIO registration for a vCPU that fails creation late in the game, e.g.\na vCPU w/ the same ID already exists in the VM.\n\nIt is important to consider the context of commit that introduced this bug\nby moving the unregistration out of __kvm_vgic_vcpu_destroy(). That\nchange correctly sought to avoid an srcu v. config_lock inversion by\nbreaking up the vCPU teardown into two parts, one guarded by the\nconfig_lock.\n\nFix the use-after-free while avoiding lock inversion by adding a\nspecial-cased unregistration to __kvm_vgic_vcpu_destroy(). This is safe\nbecause failed vCPUs are torn down outside of the config_lock." |
| } |
| ], |
| "affected": [ |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "unaffected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "arch/arm64/kvm/vgic/vgic-init.c" |
| ], |
| "versions": [ |
| { |
| "version": "f616506754d34bcfdbfbc7508b562e5c98461e9a", |
| "lessThan": "6bcc2890b883ba1d16b8942937750565f6e9db0d", |
| "status": "affected", |
| "versionType": "git" |
| }, |
| { |
| "version": "f616506754d34bcfdbfbc7508b562e5c98461e9a", |
| "lessThan": "ae8f8b37610269009326f4318df161206c59843e", |
| "status": "affected", |
| "versionType": "git" |
| } |
| ] |
| }, |
| { |
| "product": "Linux", |
| "vendor": "Linux", |
| "defaultStatus": "affected", |
| "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", |
| "programFiles": [ |
| "arch/arm64/kvm/vgic/vgic-init.c" |
| ], |
| "versions": [ |
| { |
| "version": "6.11", |
| "status": "affected" |
| }, |
| { |
| "version": "0", |
| "lessThan": "6.11", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.11.6", |
| "lessThanOrEqual": "6.11.*", |
| "status": "unaffected", |
| "versionType": "semver" |
| }, |
| { |
| "version": "6.12", |
| "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": "6.11", |
| "versionEndExcluding": "6.11.6" |
| }, |
| { |
| "vulnerable": true, |
| "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", |
| "versionStartIncluding": "6.11", |
| "versionEndExcluding": "6.12" |
| } |
| ] |
| } |
| ] |
| } |
| ], |
| "references": [ |
| { |
| "url": "https://git.kernel.org/stable/c/6bcc2890b883ba1d16b8942937750565f6e9db0d" |
| }, |
| { |
| "url": "https://git.kernel.org/stable/c/ae8f8b37610269009326f4318df161206c59843e" |
| } |
| ], |
| "title": "KVM: arm64: Unregister redistributor for failed vCPU creation", |
| "x_generator": { |
| "engine": "bippy-1.2.0" |
| } |
| } |
| }, |
| "cveMetadata": { |
| "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038", |
| "cveID": "CVE-2024-50114", |
| "requesterUserId": "gregkh@kernel.org", |
| "serial": "1", |
| "state": "PUBLISHED" |
| }, |
| "dataType": "CVE_RECORD", |
| "dataVersion": "5.0" |
| } |
