Linux: Out-of-bounds Read
CVE-2026-43274 is a high-severity out-of-bounds read 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 95438699c92947155823dcd3918049a07f3cd867, 0442b6229e2eedc95a6d3d18ce75dec7f5b5377c, f7c330a8c83c9b0332fd524097eaf3e69148164d 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 0.13% 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 95438699c92947155823dcd3918049a07f3cd867 or 0442b6229e2eedc95a6d3d18ce75dec7f5b5377c or f7c330a8c83c9b0332fd524097eaf3e69148164d, whichever matches your release line, or a later version.
- Update Linux Kernel to 6.18.16 or 6.19.6, whichever matches your release line, or a later version.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Linux | Linux | e4b1d67e71419c4af581890ecea84b04920d4116 up to, but not including, 95438699c92947155823dcd3918049a07f3cd867; e4b1d67e71419c4af581890ecea84b04920d4116 up to, but not including, 0442b6229e2eedc95a6d3d18ce75dec7f5b5377c; e4b1d67e71419c4af581890ecea84b04920d4116 up to, but not including, f7c330a8c83c9b0332fd524097eaf3e69148164d; 6.14 | 95438699c92947155823dcd3918049a07f3cd867, 0442b6229e2eedc95a6d3d18ce75dec7f5b5377c, f7c330a8c83c9b0332fd524097eaf3e69148164d |
| Linux | Linux Kernel | 6.14 up to, but not including, 6.18.16; 6.19 up to, but not including, 6.19.6 | 6.18.16, 6.19.6 |
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 CNA.
Official description
In the Linux kernel, the following vulnerability has been resolved: mailbox: mchp-ipc-sbi: fix out-of-bounds access in mchp_ipc_get_cluster_aggr_irq() The cluster_cfg array is dynamically allocated to hold per-CPU configuration structures, with its size based on the number of online CPUs. Previously, this array was indexed using hartid, which may be non-contiguous or exceed the bounds of the array, leading to out-of-bounds access. Switch to using cpuid as the index, as it is guaranteed to be within the valid range provided by for_each_online_cpu().
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Out-of-bounds Read
The product reads data past the end, or before the beginning, of the intended buffer.
How developers prevent this class of flaw
- Use a language that provides appropriate memory abstractions.
Timeline
- CVE record published.
- Record last changed materially (score, affected products, status or references).
References
Patches and release notes
Recent Out-of-bounds Read vulnerabilities
- 8.8 High severity
- 8.1 High severity
- 8.8 High severity
- 7.1 High severity
- 7.1 High severity
- 7.8 High severity
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