{"id":"DEBIAN-CVE-2022-48943","details":"In the Linux kernel, the following vulnerability has been resolved:  KVM: x86/mmu: make apf token non-zero to fix bug  In current async pagefault logic, when a page is ready, KVM relies on kvm_arch_can_dequeue_async_page_present() to determine whether to deliver a READY event to the Guest. This function test token value of struct kvm_vcpu_pv_apf_data, which must be reset to zero by Guest kernel when a READY event is finished by Guest. If value is zero meaning that a READY event is done, so the KVM can deliver another. But the kvm_arch_setup_async_pf() may produce a valid token with zero value, which is confused with previous mention and may lead the loss of this READY event.  This bug may cause task blocked forever in Guest:  INFO: task stress:7532 blocked for more than 1254 seconds.        Not tainted 5.10.0 #16  \"echo 0 \u003e /proc/sys/kernel/hung_task_timeout_secs\" disables this message.  task:stress          state:D stack:    0 pid: 7532 ppid:  1409  flags:0x00000080  Call Trace:   __schedule+0x1e7/0x650   schedule+0x46/0xb0   kvm_async_pf_task_wait_schedule+0xad/0xe0   ? exit_to_user_mode_prepare+0x60/0x70   __kvm_handle_async_pf+0x4f/0xb0   ? asm_exc_page_fault+0x8/0x30   exc_page_fault+0x6f/0x110   ? asm_exc_page_fault+0x8/0x30   asm_exc_page_fault+0x1e/0x30  RIP: 0033:0x402d00  RSP: 002b:00007ffd31912500 EFLAGS: 00010206  RAX: 0000000000071000 RBX: ffffffffffffffff RCX: 00000000021a32b0  RDX: 000000000007d011 RSI: 000000000007d000 RDI: 00000000021262b0  RBP: 00000000021262b0 R08: 0000000000000003 R09: 0000000000000086  R10: 00000000000000eb R11: 00007fefbdf2baa0 R12: 0000000000000000  R13: 0000000000000002 R14: 000000000007d000 R15: 0000000000001000","modified":"2026-09-01T16:05:29.492155018Z","published":"2024-08-22T04:15:19.027Z","upstream":["CVE-2022-48943"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-48943"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48943.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48943.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.16.12-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-48943.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}