CVE-2025-21966: linux Out-of-bounds Write
CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-21966DEBIAN-CVE-2025-21966
Published 01-04-2025Last modified 05-08-2026
Vulnerability summary
CVE-2025-21966 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.20% chance of exploitation in the next 30 days, higher than 8.8% of scored vulnerabilities.
CVSS score
7.8/10
010
High · v3.1 (CVE.org)EPSS score
0.20%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 32 · Related 28MGASA-2025-0142MGASA-2025-0146RHSA-2025:7903RHSA-2025:7956SUSE-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-7605-1USN-7605-2USN-7606-1USN-7628-1USN-7764-1USN-7764-2USN-7765-1USN-7766-1USN-7767-1USN-7767-2USN-7779-1USN-7790-1USN-7800-1USN-7801-1USN-7801-2USN-7801-3USN-7802-1USN-7809-1
Timeline
- 01-04-2025PublishedVulnerability first disclosed.
- 05-08-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: dm-flakey: Fix memory corruption in optional corrupt_bio_byte feature Fix memory corruption due to incorrect parameter being passed to bio_init
CVSS metrics
4 scores · 4 sources · 1 versionHigh 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
0.20%
Chance of exploitation in the next 30 days
Percentile
9%
Versus all other CVEs
30-day change
0.00 pp
From 0.20% on 20-09-2026
20-09-202620-10-2026
EPSS score0.20%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu110 products
- linux< 6.8.0-84.84
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1039.41
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 1d9a943898533e83f20370c0e1448d606627522e, < 818330f756f3800c37d738bd36bce60eac949938 | ≥ 1d9a943898533e83f20370c0e1448d606627522e, < 5a87e46da2418c57b445371f5ca0958d5779ba5f | ≥ 1d9a943898533e83f20370c0e1448d606627522e, < da070843e153471be4297a12fdaa64023276f40e | ≥ 1d9a943898533e83f20370c0e1448d606627522e, < 57e9417f69839cb10f7ffca684c38acd28ceb57b | 6.5
- linux_kernel≥ 6.5, < 6.6.84 | ≥ 6.7, < 6.12.20 | ≥ 6.13, < 6.13.8 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5 | 6.14:rc6
Debian1 product
- linux< 6.12.20-1
3 vendors · 113 products
