hwmon: (occ) Fix division by zero in occ_show_power_1()
Summary
| CVE | CVE-2026-31770 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-05-01 15:16:40 UTC |
| Updated | 2026-05-01 15:24:14 UTC |
| 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] |
Risk And Classification
EPSS: 0.000240000 probability, percentile 0.068060000 (date 2026-05-05)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca c7d3712362c8ab8f82f441b649d9e446e7b9aa9d git | Not specified |
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 53e6175756b8c474b6247bbcea0aad3d68357475 git | Not specified |
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 2502684b9e835de9a992ec47c3e6c6faabe3858d git | Not specified |
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 37ae8fadc74ed68e5bc364ffd17746d88e449ae3 git | Not specified |
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca bbbefc48f6617cfb738dcff7f44beb50b5dfeb38 git | Not specified |
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 243d55bd3f08cb15eee9d63f4716d4d4cdd760f5 git | Not specified |
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 7b89ce0c98bf3015f493ca4285b2d1056cd8c733 git | Not specified |
| CNA | Linux | Linux | affected c10e753d43ebd1d17e1c62bcee20c6124c2c7cca 39e2a5bf970402a8530a319cf06122e216ba57b8 git | Not specified |
| CNA | Linux | Linux | affected 5.0 | Not specified |
| CNA | Linux | Linux | unaffected 5.0 semver | Not specified |
| CNA | Linux | Linux | unaffected 5.10.253 5.10.* semver | Not specified |
| CNA | Linux | Linux | unaffected 5.15.203 5.15.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.168 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.134 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.81 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.22 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.12 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.