CVE-2025-71203: riscv: Sanitize syscall table indexing under speculation
Vulnerability summary
CVE-2025-71203 is a high (CVSS 7.0) Improper Validation of Array Index vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 4% of scored vulnerabilities.
Not severe (CVSS 7, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 15 · Related 14Timeline
- 14-02-2026PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: riscv: Sanitize syscall table indexing under speculation The syscall number is a user-controlled value used to index into the syscall table. Use array_index_nospec() to clamp this value after the bounds check to prevent speculative out-of-bounds access and subsequent data leakage via cache side channels.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated7.0HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.0HighCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.15%
Chance of exploitation in the next 30 days
Percentile
4%
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 causeAffected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 6.8.0-136.136
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 6.8.0-1061.64
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ f0bddf50586da81360627a772be0e355b62f071e, < 33743ec6679aa364ee19d1afbaa50593e9e6e443 | ≥ f0bddf50586da81360627a772be0e355b62f071e, < c45848936ebdb4fcab92f8c39510db83c16d0239 | ≥ f0bddf50586da81360627a772be0e355b62f071e, < 8b44e753795107a22ba31495686e83f4aca48f36 | ≥ f0bddf50586da81360627a772be0e355b62f071e, < 25fd7ee7bf58ac3ec7be3c9f82ceff153451946c | 6.4
- linux_kernel≥ 6.4, < 6.12.70 | ≥ 6.13, < 6.18.10 | 6.19:rc1 | 6.19:rc2 | 6.19:rc3 | 6.19:rc4
Debian1 product
- linux< 6.12.73-1 | < 6.18.10-1
3 vendors · 160 products
