CVE-2021-47217
See a problem?- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47217
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47217.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2021-47217
- Related
- Published
- 2024-04-10T19:15:48Z
- Modified
- 2024-09-11T04:51:16.594830Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
x86/hyperv: Fix NULL deref in sethvtscchange_cb() if Hyper-V setup fails
Check for a valid hvvpindex array prior to derefencing hvvpindex 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: errorcode(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:sethvtscchangecb+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: kvmarchinit+0x17c/0x280 kvminit+0x31/0x330 vmxinit+0xba/0x13a dooneinitcall+0x41/0x1c0 kernelinitfreeable+0x1f2/0x23b kernelinit+0x16/0x120 retfrom_fork+0x22/0x30
- References
-
- https://git.kernel.org/stable/c/8823ea27fff6084bbb4bc71d15378fae0220b1d8
- https://git.kernel.org/stable/c/9c177eee116cf888276d3748cb176e72562cfd5c
- https://git.kernel.org/stable/c/b0e44dfb4e4c699cca33ede431b8d127e6e8d661
- https://git.kernel.org/stable/c/b20ec58f8a6f4fef32cc71480ddf824584e24743
- https://git.kernel.org/stable/c/daf972118c517b91f74ff1731417feb4270625a4
- https://security-tracker.debian.org/tracker/CVE-2021-47217
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source