Vulnerability 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.
References
- https://git.kernel.org/stable/c/0b08be5aca212a99f8ba786fee4922feac08002c
- https://git.kernel.org/stable/c/2025b2d1f9d5cad6ea6fe85654c6c41297c3130b
- https://git.kernel.org/stable/c/75a4d8cfe7784f909b3bd69325abac8e04ecb385
- https://git.kernel.org/stable/c/8e2f8020270af7777d49c2e7132260983e4fc566
- https://git.kernel.org/stable/c/c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2c
- https://git.kernel.org/stable/c/ca235d11fc2fd8fce1dcd9d732dc780be0cde2de
- https://git.kernel.org/stable/c/d8570211a2b1ec886a462daa0be4e9983ac768bb
- https://git.kernel.org/stable/c/e0065e106f798ce6862251bc4fc030ac5cead940
FAQ
What is CVE-2026-23474?
CVE-2026-23474 is a documented vulnerability. 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 (...
How severe is CVE-2026-23474?
CVSS scoring is not yet available for CVE-2026-23474. Check NVD for updates.
Is there a patch for CVE-2026-23474?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.