7.8

CVE-2026-31747: linux Out-of-bounds Write

CVSS: 7.8v3.1HighAnalyzed
AliasesUBUNTU-CVE-2026-31747DEBIAN-CVE-2026-31747
Published 01-05-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-31747 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.7% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.18%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 40 · Related 38
MGASA-2026-0108MGASA-2026-0110OPENSUSE-SU-2026:21555-1SUSE-SU-2026:23066-1SUSE-SU-2026:23068-1SUSE-SU-2026:23193-1

Timeline

  1. 01-05-2026
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: comedi: me4000: Fix potential overrun of firmware buffer `me4000_xilinx_download()` loads the firmware that was requested by `request_firmware()`. It is possible for it to overrun the source buffer because it blindly trusts the file format. It reads a data stream length from the first 4 bytes into variable `file_length` and reads the data stream contents of length `file_length` from offset 16 onwards. Add a test to ensure that the supplied firmware is long enough to contain the header and the data stream. On failure, log an error and return `-EINVAL`. Note: The firmware loading was totally broken before commit ac584af59945 ("staging: comedi: me4000: fix firmware downloading"), but that is the most sensible target for this fix.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

+0.05 pp

From 0.13% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected 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≥ ac584af599452748187cf6d7865b1607c54ee443, < 8ddfe6495c245226a30d8b36e2f4a7aa7712e8d6 | ≥ ac584af599452748187cf6d7865b1607c54ee443, < 64b24b713e1a3ea6624480594b4f8c2ff86502f2 | ≥ ac584af599452748187cf6d7865b1607c54ee443, < f72b5567f7c117b46b4058dc6a0c7554f8565561 | ≥ ac584af599452748187cf6d7865b1607c54ee443, < 1603dd471f47762e9d1f52304edb3e49a7e62655 | ≥ ac584af599452748187cf6d7865b1607c54ee443, < 99f31aa98ab6e3805c455b65bcd01b3d48bdf1a5 | ≥ ac584af599452748187cf6d7865b1607c54ee443, < eae19cab44204537f79146f15a51811b13227c38 | ≥ ac584af599452748187cf6d7865b1607c54ee443, < de3f923ae7d91480ed3ecea1b1e1fc0dc25b597d | ≥ ac584af599452748187cf6d7865b1607c54ee443, < 3fb43a7a5b44713f892c58ead2e5f3a1bc9f4ee7 | 3.19
  • linux_kernel≥ 3.19, < 5.10.253 | ≥ 5.11, < 5.15.203 | ≥ 5.16, < 6.1.168 | ≥ 6.2, < 6.6.134 | ≥ 6.7, < 6.12.81 | ≥ 6.13, < 6.18.22 | ≥ 6.19, < 6.19.12 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.12-1

3 vendors · 160 products

References

38 links
Show all 38 references