VulnerabilityPublished 6 May 2026Updated 6 Nov 2026

CVE-2026-43281: Linux kernel · mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in fcd7f96c783626c07ee3ed75fa3739a8a2052310 : update Linux kernel when convenient.

Data as of 6 Nov 2026, 15:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in fcd7f96c783626c07ee3ed75fa3739a8a2052310, f50b39fd7c72a8734153644ee945ca0d8b2e65ab, ec0874447895b994182a962d2fee9ef075de5efd +5

Exploitation evidence

Disclosed: evidence found.
CVE published 6 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 6 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c, < fcd7f96c783626c07ee3ed75fa3739a8a2052310	Fixed in fcd7f96c783626c07ee3ed75fa3739a8a2052310
LinuxLinux	Affected ≥ 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c, < f50b39fd7c72a8734153644ee945ca0d8b2e65ab	Fixed in f50b39fd7c72a8734153644ee945ca0d8b2e65ab
LinuxLinux	Affected ≥ 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c, < ec0874447895b994182a962d2fee9ef075de5efd	Fixed in ec0874447895b994182a962d2fee9ef075de5efd
LinuxLinux	Affected ≥ 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c, < 2662ed331a69c0b551f78af58f12eb629a89a36f	Fixed in 2662ed331a69c0b551f78af58f12eb629a89a36f
LinuxLinux	Affected ≥ 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c, < 31c4c67dec3362094a6747a171a4848e98542265	Fixed in 31c4c67dec3362094a6747a171a4848e98542265
LinuxLinux	Affected ≥ 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c, < 4caae8168d1b808c7d4ff481295292e3f97f90fb	Fixed in 4caae8168d1b808c7d4ff481295292e3f97f90fb

Description

In the Linux kernel, the following vulnerability has been resolved: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate() Although it is guided that `#mbox-cells` must be at least 1, there are many instances of `#mbox-cells = <0>;` in the device tree. If that is the case and the corresponding mailbox controller does not provide `fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will be used by default and out-of-bounds accesses could occur due to lack of bounds check in that function.

References

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