Medium 5.5Published Apr 3, 2026

CVE-2026-23474mtd: Avoid boot crash in RedBoot partition table parser

Updated under an hour ago (Oct 26, 2026, 4:23 PM ET)

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It affects Linux and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ca235d11fc2fd8fce1dcd9d732dc780be0cde2de; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before e0065e106f798ce6862251bc4fc030ac5cead940; 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 builds before 0b08be5aca212a99f8ba786fee4922feac08002c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d8570211a2b1ec886a462daa0be4e9983ac768bb; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2025b2d1f9d5cad6ea6fe85654c6c41297c3130b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2c; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 75a4d8cfe7784f909b3bd69325abac8e04ecb385; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 8e2f8020270af7777d49c2e7132260983e4fc566	CNA record
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.78; from 6.13 before 6.18.20; from 6.19 before 6.19.10; 2.6.12; and 8 more ranges	NVD

References

References

https://git.kernel.org/stable/c/ca235d11fc2fd8fce1dcd9d732dc780be0cde2de	patch
https://git.kernel.org/stable/c/e0065e106f798ce6862251bc4fc030ac5cead940	patch
https://git.kernel.org/stable/c/0b08be5aca212a99f8ba786fee4922feac08002c	patch
https://git.kernel.org/stable/c/d8570211a2b1ec886a462daa0be4e9983ac768bb	patch
https://git.kernel.org/stable/c/2025b2d1f9d5cad6ea6fe85654c6c41297c3130b	patch
https://git.kernel.org/stable/c/c4054ad2d8bff4e8e937cd4a1d1a04c1e8f77a2c	patch
https://git.kernel.org/stable/c/75a4d8cfe7784f909b3bd69325abac8e04ecb385	patch
https://git.kernel.org/stable/c/8e2f8020270af7777d49c2e7132260983e4fc566	patch
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-082556.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.