CVE-2022-49726
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2022-49726
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49726.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-49726
- Related
- Published
- 2025-02-26T07:01:48Z
- Modified
- 2025-02-26T19:03:36.343465Z
- Summary
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
clocksource: hyper-v: unexport _init-annotated hvinit_clocksource()
EXPORTSYMBOL and _init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic.
modpost used to detect it, but it has been broken for a decade.
Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds.
There are two ways to fix it:
- Remove __init
- Remove EXPORT_SYMBOL
I chose the latter for this case because the only in-tree call-site, arch/x86/kernel/cpu/mshyperv.c is never compiled as modular. (CONFIGHYPERVISORGUEST is boolean)
- References
-
- https://git.kernel.org/stable/c/0414eab7c78f3518143d383e448d44fc573ac6d2
- https://git.kernel.org/stable/c/245b993d8f6c4e25f19191edfbd8080b645e12b1
- https://git.kernel.org/stable/c/937fcbb55a1e48a6422e87e8f49422c92265f102
- https://git.kernel.org/stable/c/cff3a7ce6e81418b6e8bac941779bbf5d342d626
- https://git.kernel.org/stable/c/db965e2757d95f695e606856418cd84003dd036d
- https://security-tracker.debian.org/tracker/CVE-2022-49726
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affectedFixed5.10.127-1
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