CVE-2026-31447: linux Improper Input Validation
CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-31447DEBIAN-CVE-2026-31447
Published 22-04-2026Last modified 19-10-2026
Vulnerability summary
CVE-2026-31447 is a high (CVSS 7.8) Improper Input Validation 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 · +0.05 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 43 · Related 40LSN-0122-1MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1SUSE-SU-2026:23194-1SUSE-SU-2026:23221-1SUSE-SU-2026:23231-1SUSE-SU-2026:23237-1SUSE-SU-2026:23241-1SUSE-SU-2026:23244-1SUSE-SU-2026:2450-1SUSE-SU-2026:3130-1SUSE-SU-2026:3166-1USN-8567-1USN-8574-1USN-8574-2USN-8574-3USN-8575-1USN-8575-2USN-8575-3USN-8576-1USN-8576-2USN-8595-1USN-8595-2USN-8595-3USN-8596-1USN-8597-1USN-8606-1USN-8607-1USN-8608-1USN-8609-1USN-8610-1USN-8619-1USN-8620-1USN-8620-2USN-8620-3USN-8620-4USN-8665-1USN-8668-1USN-8668-2
Timeline
- 22-04-2026PublishedVulnerability first disclosed.
- 19-10-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: ext4: reject mount if bigalloc with s_first_data_block != 0 bigalloc with s_first_data_block != 0 is not supported, reject mounting it.
CVSS metrics
5 scores · 4 sources · 2 versionsHigh 7.2Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:NSourcesSingle source
High 7.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HSourcesAll 4 agree
- OSV · UbuntuEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- NVDNIST7.8HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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
+0.05 pp
From 0.14% on 19-09-2026
19-09-202619-10-2026
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
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-136.136
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1061.64
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 281b59959707dfae03ce038cdf231bf4904e170c, < 5ad6d994255e27a3254079dfb50ca861fc31f2d0 | ≥ 281b59959707dfae03ce038cdf231bf4904e170c, < 3a926957cc95899ef88529710836edadc03c71a1 | ≥ 281b59959707dfae03ce038cdf231bf4904e170c, < 7b58c110b4e1f028eb38eec9ed3555e9be81c8b0 | ≥ 281b59959707dfae03ce038cdf231bf4904e170c, < b77de3fceafbb39f30e4ff5dc986f863d5456417 | ≥ 281b59959707dfae03ce038cdf231bf4904e170c, < d787d3ae96648dc14a3b7ca8fde817177e82c1c7 | ≥ 281b59959707dfae03ce038cdf231bf4904e170c, < ad1f6d608f33f59d21a3d025615d6786a6443998 | ≥ 281b59959707dfae03ce038cdf231bf4904e170c, < 7d5b04290156c3fc316eecc86a4f9d201ab7d44a | ≥ 281b59959707dfae03ce038cdf231bf4904e170c, < 3822743dc20386d9897e999dbb990befa3a5b3f8 | 3.2
- linux_kernel≥ 3.2, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.131 | ≥ 6.7, < 6.12.80 | ≥ 6.13, < 6.18.21 | ≥ 6.19, < 6.19.11 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5
Debian1 product
- linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.11-1
3 vendors · 160 products
