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CVE-2026-98205

Unknown

Last modified

CVE-2026-98205 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: Input: evdev - zero absinfo before partial copy in EVIOCSABS The EVIOCSABS handler copies at most the user supplied ioctl size into an uninitialized on-stack struct input_absinfo: if (copy_from_user(&abs, p, min_t(size_t, size, sizeof(struct input_absinfo)))) The size comes from _IOC_SIZE() of the ioctl command and is therefore fully controlled by userspace. A short size leaves the trailing part of the structure holding whatever was on the kernel stack, and the whole structure is then stored into the device: dev->absinfo[t] = abs; EVIOCGABS hands that back to userspace, disclosing the stale stack bytes.

Description

In the Linux kernel, the following vulnerability has been resolved: Input: evdev - zero absinfo before partial copy in EVIOCSABS The EVIOCSABS handler copies at most the user supplied ioctl size into an uninitialized on-stack struct input_absinfo: if (copy_from_user(&abs, p, min_t(size_t, size, sizeof(struct input_absinfo)))) The size comes from _IOC_SIZE() of the ioctl command and is therefore fully controlled by userspace. A short size leaves the trailing part of the structure holding whatever was on the kernel stack, and the whole structure is then stored into the device: dev->absinfo[t] = abs; EVIOCGABS hands that back to userspace, disclosing the stale stack bytes. Only the resolution field is currently cleared, which covers the legacy struct layout but not an arbitrarily short size. Zero the structure before the copy so any part not supplied by the caller reads back as zero. The existing resolution fixup is kept, since it also handles a size that partially overlaps that field.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < c0aebb57b73c7d06ad21731099afe119b113c403; >= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < 89b6ffa4bc10c436fa9aecc73be105124cd58a35; >= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < e834e134a32b6a5c600fa539bb49146f617743ab; >= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < af5f7130cbf39e6e12336d0b7a5f6e76e4e1526b; >= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < 30b853a3d71f16bd0aa66b604bc37dd1254a19b3; >= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < 71e5619db11dd6429101bd967230d0321ec5ea26; >= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < 3dfe48d5307a1ba22c58231d04257737015569ca; >= 448cd1664a573e69f54bfd32f3bb7220212b6cf5, < 8b852965b8eaf910c314dc346967ed82c8d4f235
LinuxLinux2.6.36

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-98205?
In the Linux kernel, the following vulnerability has been resolved: Input: evdev - zero absinfo before partial copy in EVIOCSABS The EVIOCSABS handler copies at most the user supplied ioctl size into an uninitialized on-stack struct input_absinfo: if (copy_from_user(&abs, p, min_t(size_t, size, sizeof(struct input_absinfo)))) The size comes from _IOC_SIZE() of the ioctl command and is therefore fully controlled by userspace. A short size leaves the trailing part of the structure holding whatever was on the kernel stack, and the whole structure is then stored into the device: dev->absinfo[t] = abs; EVIOCGABS hands that back to userspace, disclosing the stale stack bytes. Only the resolution field is currently cleared, which covers the legacy struct layout but not an arbitrarily short size. Zero the structure before the copy so any part not supplied by the caller reads back as zero. The existing resolution fixup is kept, since it also handles a size that partially overlaps that field.
How severe is CVE-2026-98205?
Severity scoring for CVE-2026-98205 is pending analysis.
How do I fix CVE-2026-98205?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST