CVE-2026-93266: Linux vulnerability

CVE-2026-93266: arm64: RSI: fix field-spanning write warning in attestation token init

In the Linux kernel, the following vulnerability has been resolved: arm64: RSI: fix field-spanning write warning in attestation token init The challenge is passed in registers a1 through a8. However, copying to &regs.a1 makes FORTIFY treat the destination as the single a1 field, resulting in a field-spanning write warning. [1] Overlay the SMCCC register structure with an RSI-specific argument layout and copy the challenge into an explicit 64-byte array. This keeps the existing a1-a8 argument encoding while giving the copy a correctly sized destination object. [1] memcpy: detected field-spanning write (size 64) of single field "&regs.a1" at ./arch/arm64/include/asm/rsi_cmds.h:119 (size 8) WARNING: ./arch/arm64/include/asm/rsi_cmds.h:119 at rsi_attestation_token_init+0xdc/0xf8 [arm_cca_guest], CPU#0: cat/3314

UnknownCVSS not scoredNot KEV-listedUpdatedOct 19, 2026, 09:08 UTC (UTC+00:00)

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Sep 24, 2026, 15:52 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

3Timeline events

0ADP providers

4Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
Sep 17, 2026, 16:02 UTC (UTC+00:00)
CVE publishedCVE Program
The CVE record was published.
Sep 24, 2026, 15:52 UTC (UTC+00:00)
CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Oct 19, 2026, 09:08 UTC (UTC+00:00)

Source materials

CVE List V5 sourceCVE List V5
https://git.kernel.org/stable/c/e505092cb200d430d5b8d8d3e926d45f29474ba3CVE reference, Linux
https://git.kernel.org/stable/c/d29a8ee271da17b5e32d7a76a9c78d43f66447caCVE reference, Linux
https://git.kernel.org/stable/c/221049874b6a78c7d87bc826581b0695cd338e2bCVE reference, Linux

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

LinuxLinuxb880a80011f56880f32bde47fc6af313359f926b, b880a80011f56880f32bde47fc6af313359f926b, b880a80011f56880f32bde47fc6af313359f926bunaffected

LinuxLinux6.13, 0, 6.18.52, 7.2.6, 7.3affected

Weakness

CWE details

No CWE listed

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