CVE-2026-31748: linux Out-of-bounds Write
Vulnerability summary
CVE-2026-31748 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.
Advisory lineage
Upstream 0 · Downstream 40 · Related 38Timeline
- 01-05-2026PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: comedi: me_daq: Fix potential overrun of firmware buffer `me2600_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. Although it checks that the supplied firmware is at least 16 bytes long, it does not check that it is long enough to contain the data stream. 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`.
CVSS metrics
3 scores · 3 sources · 1 version- 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
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
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≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < 2fc25a4c2e055cd42ea39a1b42c89bfef70e0319 | ≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < 9f39fa07259eb342908e4aa0271dee038a8ce4f8 | ≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < f3f8ec00cfb8d8e826e30b1138a56355b88e9ba8 | ≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < c16ac4e173a05011437a2d868f70cc415339065a | ≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < 1bf8761eb59e94bf7b8c17b2a1ee48f14378b172 | ≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < a47ae40339c1048f519df33ff8840731720f57cb | ≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < c8c607a77aab783f2e38cc2e0f24aa6c8f6d200b | ≥ 85acac61096f946a78cf0c4b65f7cebe580693b6, < cc797d4821c754c701d9714b58bea947e31dbbe0 | 2.6.29
- linux_kernel≥ 2.6.29, < 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
