CVE-2021-43056: fedoraproject fedora
Vulnerability summary
CVE-2021-43056 is a medium (CVSS 5.5) vulnerability in fedoraproject fedora. EPSS estimates a 0.37% chance of exploitation in the next 30 days, higher than 30.7% 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 20 · Related 19Timeline
- 28-10-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
An issue was discovered in the Linux kernel for powerpc before 5.14.15. It allows a malicious KVM guest to crash the host, when the host is running on Power8, due to an arch/powerpc/kvm/book3s_hv_rmhandlers.S implementation bug in the handling of the SRR1 register values.
CVSS metrics
4 scores · 3 sources · 2 versions- 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
0.37%
Chance of exploitation in the next 30 days
Percentile
31%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.37% 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 causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu57 products
- linux< 5.4.0-92.103
- linux-aws< 5.4.0-1061.64
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11< 5.11.0-1023.24~20.04.1
- linux-aws-5.3All versions (No fix recorded)
Debian1 product
- linux< 5.14.16-1
Fedoraproject1 product
- fedoraEOL33 | 34 | 35
Linux1 product
- linux_kernel≥ 5.2, < 5.4.15
4 vendors · 60 products
References
16 links- git.kernel.org/linus/cdeb5d7d890e14f3b70e8087e745c4a6a7d9f337X Refsource MISCREPORTPatchVendor Advisory
- cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15X Refsource MISCREPORTRelease NotesVendor Advisory
- www.openwall.com/lists/oss-security/2021/10/28/1Mailing ListX Refsource MLISTREPORTPatchThird Party Advisory
