Linux: Divide By Zero
CVE-2024-26945 is a high-severity divide by zero vulnerability in Linux, with a CVSS 3.1 base score of 8.4 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. The record lists versions a5ca1be7f9817de4e93085778b3ee2219bdc2664, 5a7e89d3315d1be86aff8a8bf849023cda6547f7 as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.24% chance of exploitation within 30 days, which is low compared with other CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Linux to a5ca1be7f9817de4e93085778b3ee2219bdc2664 or 5a7e89d3315d1be86aff8a8bf849023cda6547f7, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | ea7a5cbb43696cfacf73e61916d1860ac30b5b2f up to, but not including, a5ca1be7f9817de4e93085778b3ee2219bdc2664; ea7a5cbb43696cfacf73e61916d1860ac30b5b2f up to, but not including, 5a7e89d3315d1be86aff8a8bf849023cda6547f7; 6.8 | a5ca1be7f9817de4e93085778b3ee2219bdc2664, 5a7e89d3315d1be86aff8a8bf849023cda6547f7 |
| Linux | linux_kernel | 1da177e4c3f4 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- LocalThe attacker needs local access or must trick a user into running something.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- HighAll data handled by the component can be read.
- Integrity
- HighData or code can be modified at will.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. Scored by CISA (ADP).
Official description
In the Linux kernel, the following vulnerability has been resolved: crypto: iaa - Fix nr_cpus < nr_iaa case If nr_cpus < nr_iaa, the calculated cpus_per_iaa will be 0, which causes a divide-by-0 in rebalance_wq_table(). Make sure cpus_per_iaa is 1 in that case, and also in the nr_iaa == 0 case, even though cpus_per_iaa is never used if nr_iaa == 0, for paranoia.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Divide By Zero
The product divides a value by zero.
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Divide By Zero vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
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