CVE-2025-21863: linux
CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-21863DEBIAN-CVE-2025-21863
Published 12-03-2025Last modified 15-10-2026
Vulnerability summary
CVE-2025-21863 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.27% chance of exploitation in the next 30 days, higher than 17.9% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.27%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 35 · Related 31MGASA-2025-0111MGASA-2025-0112RHSA-2025:20095RHSA-2025:20518RHSA-2026:1703SUSE-SU-2025:01614-1SUSE-SU-2025:01707-1SUSE-SU-2025:01919-1SUSE-SU-2025:01951-1SUSE-SU-2025:01964-1SUSE-SU-2025:01967-1SUSE-SU-2025:20192-1SUSE-SU-2025:20206-1SUSE-SU-2025:20270-1SUSE-SU-2025:20283-1USN-7521-1USN-7521-3USN-7703-1USN-7703-2USN-7703-3USN-7703-4USN-7719-1USN-7737-1USN-8575-1USN-8575-2USN-8575-3USN-8576-1USN-8576-2USN-8610-1USN-8620-1USN-8620-2USN-8620-3USN-8620-4USN-8668-1USN-8668-2USN-7521-2
Timeline
- 12-03-2025PublishedVulnerability first disclosed.
- 15-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: prevent opcode speculation sqe->opcode is used for different tables, make sure we santitise it against speculations.
CVSS metrics
5 scores · 4 sources · 2 versionsLow 2.0Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:L/AC:H/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:NSourcesSingle source
High 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HSourcesAll 4 agree
- 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
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
0.27%
Chance of exploitation in the next 30 days
Percentile
18%
Versus all other CVEs
30-day change
+0.04 pp
From 0.23% on 19-09-2026
19-09-202619-10-2026
EPSS score0.27%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu126 products
- linux< 5.15.0-186.196 | < 6.8.0-78.78
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 5.15.0-1112.119 | < 6.8.0-1035.37
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ d3656344fea0339fb0365c8df4d2beba4e0089cd, < 87e9eef43c758da267f6332678058a79764c7eba | ≥ d3656344fea0339fb0365c8df4d2beba4e0089cd, < 18eae8420081ef8e043ad455937bfb470ef08607 | ≥ d3656344fea0339fb0365c8df4d2beba4e0089cd, < d261ead565a080e3411b0dd04e6d58a52471cac8 | ≥ d3656344fea0339fb0365c8df4d2beba4e0089cd, < b9826e3b26ec031e9063f64a7c735449c43955e4 | ≥ d3656344fea0339fb0365c8df4d2beba4e0089cd, < 506b9b5e8c2d2a411ea8fe361333f5081c56d23a | ≥ d3656344fea0339fb0365c8df4d2beba4e0089cd, < fdbfd52bd8b85ed6783365ff54c82ab7067bd61b | ≥ d3656344fea0339fb0365c8df4d2beba4e0089cd, < 1e988c3fe1264708f4f92109203ac5b1d65de50b | 5.6
- linux_kernel≥ 5.6, < 6.6.80 | ≥ 6.7, < 6.12.17 | ≥ 6.13, < 6.13.5 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3
Debian1 product
- linux< 6.1.176-1 | < 6.12.17-1
3 vendors · 129 products
