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CVE-2021-47112— x86/kvm: Teardown PV features on boot CPU as well

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，该漏洞源于 x86/kvm 模块中存在错误。

CVSS 7.8 · High EPSS 0.25% · P15

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux fd10cde9294f73eeccbc16f3fec1ae6cde7b800c< 7620a669111b52f224d006dea9e1e688e2d62c54 affected
fd10cde9294f73eeccbc16f3fec1ae6cde7b800c< 38b858da1c58ad46519a257764e059e663b59ff2 affected
fd10cde9294f73eeccbc16f3fec1ae6cde7b800c< d1629b5b925de9b27979e929dae7fcb766daf6b6 affected
fd10cde9294f73eeccbc16f3fec1ae6cde7b800c< 8b79feffeca28c5459458fe78676b081e87c93a4 affected
2.6.38 affected
< 2.6.38 unaffected
5.4.125≤ 5.4.* unaffected
5.10.43≤ 5.10.* unaffected
… +2 more rows
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I. Basic Information for CVE-2021-47112

Vulnerability Information
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Vulnerability Title
x86/kvm: Teardown PV features on boot CPU as well
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Teardown PV features on boot CPU as well Various PV features (Async PF, PV EOI, steal time) work through memory shared with hypervisor and when we restore from hibernation we must properly teardown all these features to make sure hypervisor doesn't write to stale locations after we jump to the previously hibernated kernel (which can try to place anything there). For secondary CPUs the job is already done by kvm_cpu_down_prepare(), register syscore ops to do the same for boot CPU.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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，该漏洞源于 x86/kvm 模块中存在错误。
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 fd10cde9294f73eeccbc16f3fec1ae6cde7b800c ~ 7620a669111b52f224d006dea9e1e688e2d62c54 -
Linux Linux 2.6.38 -

II. Public POCs for CVE-2021-47112

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III. Intelligence Information for CVE-2021-47112

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Other References for CVE-2021-47112 (4)

Same Patch Batch · Linux · 2024-03-15 · 26 CVEs total

CVE-2021-47111 8.8 HIGH xen-netback: take a reference to the RX task thread
CVE-2021-47131 8.1 HIGH net/tls: Fix use-after-free after the TLS device goes down and up
CVE-2021-47123 7.8 HIGH io_uring: fix ltout double free on completion race
CVE-2021-47135 7.8 HIGH mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report
CVE-2021-47129 7.8 HIGH netfilter: nft_ct: skip expectations for confirmed conntrack
CVE-2021-47126 7.8 HIGH ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions
CVE-2021-47124 7.8 HIGH io_uring: fix link timeout refs
CVE-2021-47132 7.5 HIGH mptcp: fix sk_forward_memory corruption on retransmission
CVE-2021-47109 7.5 HIGH neighbour: allow NUD_NOARP entries to be forced GCed
CVE-2021-47130 7.5 HIGH nvmet: fix freeing unallocated p2pmem
CVE-2021-47113 7.1 HIGH btrfs: abort in rename_exchange if we fail to insert the second ref
CVE-2021-47127 ice: track AF_XDP ZC enabled queues in bitmap
CVE-2021-47110 x86/kvm: Disable kvmclock on all CPUs on shutdown
CVE-2021-47134 efi/fdt: fix panic when no valid fdt found
CVE-2021-47133 HID: amd_sfh: Fix memory leak in amd_sfh_work
CVE-2021-47114 ocfs2: fix data corruption by fallocate
CVE-2021-47128 bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks
CVE-2021-47118 pid: take a reference when initializing `cad_pid`
CVE-2021-47116 ext4: fix memory leak in ext4_mb_init_backend on error path.
CVE-2021-47125 sch_htb: fix refcount leak in htb_parent_to_leaf_offload

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47112

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