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CVE-2021-47110— x86/kvm: Disable kvmclock on all CPUs on shutdown

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。

AI Predicted 3.3 Difficulty: Hard EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 1e977aa12dd4f80688b1f243762212e75c6d7fe8< 9084fe1b3572664ad276f427dce575f580c9799a affected
1e977aa12dd4f80688b1f243762212e75c6d7fe8< 3b0becf8b1ecf642a9edaf4c9628ffc641e490d6 affected
1e977aa12dd4f80688b1f243762212e75c6d7fe8< 1df2dc09926f61319116c80ee85701df33577d70 affected
1e977aa12dd4f80688b1f243762212e75c6d7fe8< c02027b5742b5aa804ef08a4a9db433295533046 affected
2.6.26 affected
< 2.6.26 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-2021-47110

Vulnerability Information
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Vulnerability Title
x86/kvm: Disable kvmclock on all CPUs on shutdown
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: x86/kvm: Disable kvmclock on all CPUs on shutdown Currenly, we disable kvmclock from machine_shutdown() hook and this only happens for boot CPU. We need to disable it for all CPUs to guard against memory corruption e.g. on restore from hibernate. Note, writing '0' to kvmclock MSR doesn't clear memory location, it just prevents hypervisor from updating the location so for the short while after write and while CPU is still alive, the clock remains usable and correct so we don't need to switch to some other clocksource.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 1e977aa12dd4f80688b1f243762212e75c6d7fe8 ~ 9084fe1b3572664ad276f427dce575f580c9799a -
Linux Linux 2.6.26 -

II. Public POCs for CVE-2021-47110

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III. Intelligence Information for CVE-2021-47110

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Other References for CVE-2021-47110 (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-2021-47135 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-2021-47123 7.8 HIGH io_uring: fix ltout double free on completion race
CVE-2021-47112 7.8 HIGH x86/kvm: Teardown PV features on boot CPU as well
CVE-2021-47109 7.5 HIGH neighbour: allow NUD_NOARP entries to be forced GCed
CVE-2021-47132 7.5 HIGH mptcp: fix sk_forward_memory corruption on retransmission
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-2021-47134 efi/fdt: fix panic when no valid fdt found
CVE-2021-47133 HID: amd_sfh: Fix memory leak in amd_sfh_work
CVE-2021-47128 bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks
CVE-2021-47118 pid: take a reference when initializing `cad_pid`
CVE-2021-47114 ocfs2: fix data corruption by fallocate
CVE-2021-47125 sch_htb: fix refcount leak in htb_parent_to_leaf_offload
CVE-2021-47116 ext4: fix memory leak in ext4_mb_init_backend on error path.

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-2021-47110

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