Linux Kernel: poll_msec sysfs truncation fix with kstrtouint
CVE-2026-98157 Published on September 25, 2026
EDAC/device_sysfs: Use kstrtouint() for poll_msec to prevent truncation
In the Linux kernel, the following vulnerability has been resolved:
EDAC/device_sysfs: Use kstrtouint() for poll_msec to prevent truncation
The poll_msec sysfs store file uses simple_strtoul() which accepts an unsigned
long, but the target field (poll_msec) is unsigned int. On 64-bit systems,
a value > UINT_MAX is silently truncated when stored.
Fix the mismatch by using kstrtouint() instead. This rejects values larger
than UINT_MAX at parse time, making truncation impossible. Also add a check
for value < 1 to reject the 0-delay case, which would cause the poll work to
spin without delay and consume 100% CPU.
Products Associated with CVE-2026-98157
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Affected Versions
Linux:- Version e27e3dac651771fe3250f6305dee277bce29fc5d and below ea01c061d839b520f385f112908de1c6e3391327 is affected.
- Version e27e3dac651771fe3250f6305dee277bce29fc5d and below 528052af901d6e6bbfa0e52362a70a58a5dd1e43 is affected.
- Version e27e3dac651771fe3250f6305dee277bce29fc5d and below 0e022ee4f8e0dc843ba4c80bb75408a7704279af is affected.
- Version e27e3dac651771fe3250f6305dee277bce29fc5d and below 66cc9dec919dd63d8e4b3d386f7aed3ae684e645 is affected.
- Version 2.6.23 is affected.
- Before 2.6.23 is unaffected.
- Version 6.12.111, <= 6.12.* is unaffected.
- Version 6.18.53, <= 6.18.* is unaffected.
- Version 7.2.7, <= 7.2.* is unaffected.
- Version 7.3-rc2, <= * is unaffected.