CVE-2026-23156: efivarfs: fix error propagation in efivar_entry_get()
Vulnerability summary
CVE-2026-23156 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.4% of scored vulnerabilities.
Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 29 · Related 25Timeline
- 14-02-2026PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: efivarfs: fix error propagation in efivar_entry_get() efivar_entry_get() always returns success even if the underlying __efivar_entry_get() fails, masking errors. This may result in uninitialized heap memory being copied to userspace in the efivarfs_file_read() path. Fix it by returning the error from __efivar_entry_get().
CVSS metrics
3 scores · 3 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.14%
Chance of exploitation in the next 30 days
Percentile
3%
Versus all other CVEs
30-day change
Increase +0.01 pp
From 0.13% 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.
Ubuntu130 products
- linux< 6.8.0-117.117 | All versions (No fix recorded)
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1055.58 | All versions (No fix recorded)
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 2d82e6227ea189c0589e7383a36616ac2a2d248c, < 3960f1754664661a970dc9ebbab44ff93a0b4c42 | ≥ 2d82e6227ea189c0589e7383a36616ac2a2d248c, < 510a16f1c5c1690b33504052bc13fbc2772c23f8 | ≥ 2d82e6227ea189c0589e7383a36616ac2a2d248c, < 89b8ca709eeeabcc11ebba64806677873a2787a8 | ≥ 2d82e6227ea189c0589e7383a36616ac2a2d248c, < e4e15a0a4403c96d9898d8398f0640421df9cb16 | ≥ 2d82e6227ea189c0589e7383a36616ac2a2d248c, < 4b22ec1685ce1fc0d862dcda3225d852fb107995 | 6.0
- linux_kernel≥ 6.0, < 6.1.162 | ≥ 6.2, < 6.6.123 | ≥ 6.7, < 6.12.69 | ≥ 6.13, < 6.18.9 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4 | 6.19:rc5 | 6.19:rc6 | 6.19:rc7
Debian1 product
- linux< 6.1.162-1 | < 6.12.69-1 | < 6.18.9-1
3 vendors · 133 products
