CVE-2026-31770: Linux kernel · hwmon: (occ) Fix division by zero in occ_show_power_1()
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 11 Nov 2026, 23:24 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- EPSS
- 0.1% chance of exploitation in 30 days – higher than 2% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 1 May 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.
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]
References
- git.kernel.org/stable/c/c7d3712362c8ab8f82f441b649d9e446e7b9aa9d (opens in a new tab)
- git.kernel.org/stable/c/53e6175756b8c474b6247bbcea0aad3d68357475 (opens in a new tab)
- git.kernel.org/stable/c/2502684b9e835de9a992ec47c3e6c6faabe3858d (opens in a new tab)
- git.kernel.org/stable/c/37ae8fadc74ed68e5bc364ffd17746d88e449ae3 (opens in a new tab)
- git.kernel.org/stable/c/bbbefc48f6617cfb738dcff7f44beb50b5dfeb38 (opens in a new tab)
- git.kernel.org/stable/c/243d55bd3f08cb15eee9d63f4716d4d4cdd760f5 (opens in a new tab)
- git.kernel.org/stable/c/7b89ce0c98bf3015f493ca4285b2d1056cd8c733 (opens in a new tab)
- git.kernel.org/stable/c/39e2a5bf970402a8530a319cf06122e216ba57b8 (opens in a new tab)