CVE-2025-21793: linux Divide By Zero
CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21793DEBIAN-CVE-2025-21793
Published 27-02-2025Last modified 11-05-2026
Vulnerability summary
CVE-2025-21793 is a medium (CVSS 5.5) Divide By Zero vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.8% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)EPSS score
0.22%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 16 · Related 17Timeline
- 27-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: spi: sn-f-ospi: Fix division by zero When there is no dummy cycle in the spi-nor commands, both dummy bus cycle bytes and width are zero. Because of the cpu's warning when divided by zero, the warning should be avoided. Return just zero to avoid such calculations.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- 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
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
12%
Versus all other CVEs
30-day change
+0.01 pp
From 0.21% on 19-09-2026
19-09-202619-10-2026
EPSS score0.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu107 products
- linux< 6.8.0-78.78
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1035.37
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 1b74dd64c8612619e399e5a31da79a3636914495, < 966328191b4c389c0f2159fa242915f51cbc1679 | ≥ 1b74dd64c8612619e399e5a31da79a3636914495, < 4df6f005bef04a3dd16c028124a1b5684db3922b | ≥ 1b74dd64c8612619e399e5a31da79a3636914495, < 7434135553bc03809a55803ee6a8dcaae6240d55 | ≥ 1b74dd64c8612619e399e5a31da79a3636914495, < 3588b1c0fde2f58d166e3f94a5a58d64b893526c | 6.2
- linux_kernel≥ 6.2, < 6.6.79 | ≥ 6.7, < 6.12.16 | ≥ 6.13, < 6.13.4 | 6.14:rc1 | 6.14:rc2
Debian1 product
- linux< 6.12.16-1
3 vendors · 110 products
