CVE-2026-23474

mtd: Avoid boot crash in RedBoot partition table parser

State: Published
Severity: Not scored
Published: Apr 3, 2026
Updated: Oct 15, 2026
Reserved: Jan 13, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

mtd: Avoid boot crash in RedBoot partition table parser

Given CONFIG_FORTIFY_SOURCE=y and a recent compiler, commit 439a1bcac648 ("fortify: Use __builtin_dynamic_object_size() when available") produces the warning below and an oops.

Searching for RedBoot partition table in 50000000.flash at offset 0x7e0000 ------------[ cut here ]------------ WARNING: lib/string_helpers.c:1035 at 0xc029e04c, CPU#0: swapper/0/1 memcmp: detected buffer overflow: 15 byte read of buffer size 14 Modules linked in: CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.19.0 #1 NONE

As Kees said, "'names' is pointing to the final 'namelen' many bytes of the allocation ... 'namelen' could be basically any length at all. This fortify warning looks legit to me -- this code used to be reading beyond the end of the allocation."

Since the size of the dynamic allocation is calculated with strlen() we can use strcmp() instead of memcmp() and remain within bounds.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ca235d11fc2fd8fce1dcd9d732dc780be0cde2deAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e0065e106f798ce6862251bc4fc030ac5cead940Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0b08be5aca212a99f8ba786fee4922feac08002cAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d8570211a2b1ec886a462daa0be4e9983ac768bbAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2025b2d1f9d5cad6ea6fe85654c6c41297c3130bAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2cAffected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 75a4d8cfe7784f909b3bd69325abac8e04ecb385Affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8e2f8020270af7777d49c2e7132260983e4fc566Affected
LinuxLinux	2.6.12Affected before 2.6.12Not affected 5.10.253 through 5.10.Not affected 5.15.203 through 5.15.Not affected 6.1.167 through 6.1.Not affected 6.6.130 through 6.6.Not affected 6.12.78 through 6.12.Not affected 6.18.20 through 6.18.Not affected 6.19.10 through 6.19.*Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before ca235d11fc2fd8fce1dcd9d732dc780be0cde2deAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e0065e106f798ce6862251bc4fc030ac5cead940Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 0b08be5aca212a99f8ba786fee4922feac08002cAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before d8570211a2b1ec886a462daa0be4e9983ac768bbAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 2025b2d1f9d5cad6ea6fe85654c6c41297c3130bAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2cAffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 75a4d8cfe7784f909b3bd69325abac8e04ecb385Affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 8e2f8020270af7777d49c2e7132260983e4fc566Affected

LinuxLinux

2.6.12Affected
before 2.6.12Not affected
5.10.253 through 5.10.*Not affected
5.15.203 through 5.15.*Not affected
6.1.167 through 6.1.*Not affected
6.6.130 through 6.6.*Not affected
6.12.78 through 6.12.*Not affected
6.18.20 through 6.18.*Not affected
6.19.10 through 6.19.*Not affected
7.0 and laterNot affected

References

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