5.5

CVE-2026-31770: linux Divide By Zero

CVSS: 5.5v3.1MediumAnalyzed
AliasesUBUNTU-CVE-2026-31770DEBIAN-CVE-2026-31770
Published 01-05-2026Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2026-31770 is a medium (CVSS 5.5) Divide By Zero vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.1% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 41 · Related 39
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: hwmon: (occ) Fix division by zero in occ_show_power_1() In occ_show_power_1() case 1, the accumulator is divided by update_tag without checking for zero. If no samples have been collected yet (e.g. during early boot when the sensor block is included but hasn't been updated), update_tag is zero, causing a kernel divide-by-zero crash. The 2019 fix in commit 211186cae14d ("hwmon: (occ) Fix division by zero issue") only addressed occ_get_powr_avg() used by occ_show_power_2() and occ_show_power_a0(). This separate code path in occ_show_power_1() was missed. Fix this by reusing the existing occ_get_powr_avg() helper, which already handles the zero-sample case and uses mul_u64_u32_div() to multiply before dividing for better precision. Move the helper above occ_show_power_1() so it is visible at the call site. [groeck: Fix alignment problems reported by checkpatch]

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

+0.04 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.16%

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

Ubuntu153 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≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < c7d3712362c8ab8f82f441b649d9e446e7b9aa9d | ≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < 53e6175756b8c474b6247bbcea0aad3d68357475 | ≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < 2502684b9e835de9a992ec47c3e6c6faabe3858d | ≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < 37ae8fadc74ed68e5bc364ffd17746d88e449ae3 | ≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < bbbefc48f6617cfb738dcff7f44beb50b5dfeb38 | ≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5 | ≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < 7b89ce0c98bf3015f493ca4285b2d1056cd8c733 | ≥ c10e753d43ebd1d17e1c62bcee20c6124c2c7cca, < 39e2a5bf970402a8530a319cf06122e216ba57b8 | 5.0
  • linux_kernel≥ 5.0, < 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 · 156 products

References

39 links
Show all 39 references