AI Score
Confidence
Low
EPSS
Percentile
15.5%
SSVC
Exploitation
none
Automatable
no
Technical Impact
partial
In the Linux kernel, the following vulnerability has been resolved:
x86/hyperv: Fix NULL deref in set_hv_tscchange_cb() if Hyper-V setup fails
Check for a valid hv_vp_index array prior to derefencing hv_vp_index when
setting Hyper-V’s TSC change callback. If Hyper-V setup failed in
hyperv_init(), the kernel will still report that it’s running under
Hyper-V, but will have silently disabled nearly all functionality.
BUG: kernel NULL pointer dereference, address: 0000000000000010
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0
Oops: 0000 [#1] SMP
CPU: 4 PID: 1 Comm: swapper/0 Not tainted 5.15.0-rc2+ #75
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0010:set_hv_tscchange_cb+0x15/0xa0
Code: <8b> 04 82 8b 15 12 17 85 01 48 c1 e0 20 48 0d ee 00 01 00 f6 c6 08
…
Call Trace:
kvm_arch_init+0x17c/0x280
kvm_init+0x31/0x330
vmx_init+0xba/0x13a
do_one_initcall+0x41/0x1c0
kernel_init_freeable+0x1f2/0x23b
kernel_init+0x16/0x120
ret_from_fork+0x22/0x30
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "93286261de1b",
"lessThan": "b20ec58f8a6f",
"versionType": "git"
},
{
"status": "affected",
"version": "93286261de1b",
"lessThan": "b0e44dfb4e4c",
"versionType": "git"
},
{
"status": "affected",
"version": "93286261de1b",
"lessThan": "9c177eee116c",
"versionType": "git"
},
{
"status": "affected",
"version": "93286261de1b",
"lessThan": "8823ea27fff6",
"versionType": "git"
},
{
"status": "affected",
"version": "93286261de1b",
"lessThan": "daf972118c51",
"versionType": "git"
}
],
"programFiles": [
"arch/x86/hyperv/hv_init.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.16"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.16",
"versionType": "custom"
},
{
"status": "unaffected",
"version": "4.19.218",
"versionType": "custom",
"lessThanOrEqual": "4.19.*"
},
{
"status": "unaffected",
"version": "5.4.162",
"versionType": "custom",
"lessThanOrEqual": "5.4.*"
},
{
"status": "unaffected",
"version": "5.10.82",
"versionType": "custom",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.5",
"versionType": "custom",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "5.16",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"arch/x86/hyperv/hv_init.c"
],
"defaultStatus": "affected"
}
]
git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8
git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c
git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661
git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743
git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4