Kernel heap over-read via unaligned FlexSPI write
Published Sep 27, 2024 · Updated May 11, 2026
Out-of-bounds read in Linux 5.1 through 6.11-rc7 allows attackers to read past a heap buffer through an unaligned NXP FlexSPI NOR write. In nxp_fspi_exec_op, the TX FIFO tail path copies a four-byte word from a shorter source buffer instead of limiting memcpy to the remaining data length. The demonstrated path writes three bytes to /dev/mtd0 on an NXP FlexSPI-equipped system; the published reproducer runs as UID 0 and records a KASAN-detected read without establishing direct disclosure of adjacent data.
Summary
What happened
Out-of-bounds read in Linux 5.1 through 6.11-rc7 allows attackers to read past a heap buffer through an unaligned NXP FlexSPI NOR write. In nxp_fspi_exec_op, the TX FIFO tail path copies a four-byte word from a shorter source buffer instead of limiting memcpy to the remaining data length. The demonstrated path writes three bytes to /dev/mtd0 on an NXP FlexSPI-equipped system; the published reproducer runs as UID 0 and records a KASAN-detected read without establishing direct disclosure of adjacent data.
The record
- CVE
- CVE-2024-46853
- Published
- Sep 27, 2024
- Updated
- May 11, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-787
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Sep 27, 2024CVE publishedPublication date reported by the CVE source.
- May 11, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=5.1
- Affected versionversion=a5356aef6a907c2e2aed0caaa2b88b6021394471 <09af8b0ba70072be831f3ec459f4063d570f9e24
- Affected versionversion=a5356aef6a907c2e2aed0caaa2b88b6021394471 <2a8787c1cdc7be24fdd8953ecd1a8743a1006235
- Affected versionversion=a5356aef6a907c2e2aed0caaa2b88b6021394471 <491f9646f7ac31af5fca71be1a3e5eb8aa7663ad
- Affected versionversion=a5356aef6a907c2e2aed0caaa2b88b6021394471 <609260542cf86b459c57618b8cdec8020394b7ad
- Affected versionversion=a5356aef6a907c2e2aed0caaa2b88b6021394471 <aa05db44db5f409f6d91c27b5737efb49fb45d9f
- Affected versionversion=a5356aef6a907c2e2aed0caaa2b88b6021394471 <af9ca9ca3e44f48b2a191e100d452fbf850c3d87
- Affected versionversion=a5356aef6a907c2e2aed0caaa2b88b6021394471 <d1a1dfcec77c57b1181da93d11a3db1bc4eefa97
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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