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CVE-2026-43274mailbox: mchp-ipc-sbi: fix out-of-bounds access in mchp_ipc_get_cluster_aggr_irq()

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().

Timeline

  1. ID reserved

    By Linux

  2. · 5 days later

    Published

  3. · 3 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2026-43274, by who scored it
Scored byCVSSScoreVector
LinuxCNA (assigner)3.1High8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVDNVD · Analyzed3.1High8.4CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (exploitation in 30 days)
0.13% · top 97% of all CVEs (13 Nov 2026)
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.4.

Affected products

  • Linux · Linux

    • affected e4b1d67e71419c4af581890ecea84b04920d4116 – < 95438699c92947155823dcd3918049a07f3cd867
    • affected e4b1d67e71419c4af581890ecea84b04920d4116 – < 0442b6229e2eedc95a6d3d18ce75dec7f5b5377c
    • affected e4b1d67e71419c4af581890ecea84b04920d4116 – < f7c330a8c83c9b0332fd524097eaf3e69148164d

  • Linux · Linux

    • affected 6.14
    • unaffected < 6.14
    • unaffected 6.18.16 – ≤ 6.18.*
    • unaffected 6.19.6 – ≤ 6.19.*
    • unaffected 7.0 – ≤ *

References

References3

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .