CVE-2022-49726: clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()
Vulnerability summary
CVE-2022-49726 is a medium (CVSS 5.5) Use of Uninitialized Resource vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 19.7% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 6 · Related 4Timeline
- 26-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: clocksource: hyper-v: unexport __init-annotated hv_init_clocksource() EXPORT_SYMBOL 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. (CONFIG_HYPERVISOR_GUEST is boolean)
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
20%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.27% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu107 products
- linux< 5.4.0-126.142 | < 5.15.0-48.54
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.4.0-1085.92 | < 5.15.0-1020.24
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ dd2cb348613b44f9d948b068775e159aad298599, < cff3a7ce6e81418b6e8bac941779bbf5d342d626 | ≥ dd2cb348613b44f9d948b068775e159aad298599, < db965e2757d95f695e606856418cd84003dd036d | ≥ dd2cb348613b44f9d948b068775e159aad298599, < 0414eab7c78f3518143d383e448d44fc573ac6d2 | ≥ dd2cb348613b44f9d948b068775e159aad298599, < 937fcbb55a1e48a6422e87e8f49422c92265f102 | ≥ dd2cb348613b44f9d948b068775e159aad298599, < 245b993d8f6c4e25f19191edfbd8080b645e12b1 | 5.3
- linux_kernel≥ 5.3, < 5.4.200 | ≥ 5.5, < 5.10.124 | ≥ 5.11, < 5.15.49 | ≥ 5.16, < 5.18.6 | 5.19:rc1 | 5.19:rc2
Debian1 product
- linux< 5.18.14-1
3 vendors · 110 products
