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CVE-2022-48943— KVM: x86/mmu: make apf token non-zero to fix bug

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞。攻击者利用该漏洞可以导致访客中的进程永久阻塞。

CVSS 7.1 · High EPSS 0.25% · P15

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 2635b5c4a0e407b84f68e188c719f28ba0e9ae1b< 72fdfc75d4217b32363cc80def3de2cb3fef3f02 affected
2635b5c4a0e407b84f68e188c719f28ba0e9ae1b< 4c3644b6c96c5daa5149e5abddc07234eea47c7c affected
2635b5c4a0e407b84f68e188c719f28ba0e9ae1b< 62040f5cd7d937de547836e747b6aa8212fec573 affected
2635b5c4a0e407b84f68e188c719f28ba0e9ae1b< 6f3c1fc53d86d580d8d6d749c4af23705e4f6f79 affected
5.8 affected
< 5.8 unaffected
5.10.103≤ 5.10.* unaffected
5.15.26≤ 5.15.* unaffected
… +2 more rows
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I. Basic Information for CVE-2022-48943

Vulnerability Information
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Vulnerability Title
KVM: x86/mmu: make apf token non-zero to fix bug
Source: CVE Program / CVE List V5
Vulnerability Description
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 > /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
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞。攻击者利用该漏洞可以导致访客中的进程永久阻塞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 2635b5c4a0e407b84f68e188c719f28ba0e9ae1b ~ 72fdfc75d4217b32363cc80def3de2cb3fef3f02 -
Linux Linux 5.8 -

II. Public POCs for CVE-2022-48943

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III. Intelligence Information for CVE-2022-48943

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Other References for CVE-2022-48943 (4)

Same Patch Batch · Linux · 2024-08-22 · 42 CVEs total

CVE-2022-48941 8.8 HIGH ice: fix concurrent reset and removal of VFs
CVE-2022-48919 8.8 HIGH cifs: fix double free race when mount fails in cifs_get_root()
CVE-2022-48923 7.8 HIGH btrfs: prevent copying too big compressed lzo segment
CVE-2022-48925 7.8 HIGH RDMA/cma: Do not change route.addr.src_addr outside state checks
CVE-2022-48927 7.8 HIGH iio: adc: tsc2046: fix memory corruption by preventing array overflow
CVE-2022-48913 7.8 HIGH blktrace: fix use after free for struct blk_trace
CVE-2022-48912 7.8 HIGH netfilter: fix use-after-free in __nf_register_net_hook()
CVE-2022-48911 7.8 HIGH netfilter: nf_queue: fix possible use-after-free
CVE-2022-48932 7.8 HIGH net/mlx5: DR, Fix slab-out-of-bounds in mlx5_cmd_dr_create_fte
CVE-2022-48935 7.8 HIGH netfilter: nf_tables: unregister flowtable hooks on netns exit
CVE-2022-48940 7.8 HIGH bpf: Fix crash due to incorrect copy_map_value
CVE-2022-48933 netfilter: nf_tables: fix memory leak during stateful obj update
CVE-2022-48931 configfs: fix a race in configfs_{,un}register_subsystem()
CVE-2022-48934 nfp: flower: Fix a potential leak in nfp_tunnel_add_shared_mac()
CVE-2022-48937 io_uring: add a schedule point in io_add_buffers()
CVE-2022-48930 RDMA/ib_srp: Fix a deadlock
CVE-2022-48929 bpf: Fix crash due to out of bounds access into reg2btf_ids.
CVE-2022-48928 iio: adc: men_z188_adc: Fix a resource leak in an error handling path
CVE-2022-48938 CDC-NCM: avoid overflow in sanity checking
CVE-2022-48939 bpf: Add schedule points in batch ops

Showing top 20 of 42 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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