CVE-2026-98176drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as ffs(q->eop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1 But ffs can in theory return 1 or 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096). Change this to ffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4) using properties of logarithms. (cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)
- CVSS
- Not yet scored
- 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
- Received
- Record last updated
- Oct 7, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 14328aa58ce523a59996c5a82681c43ec048cc33 builds before 82e1b8299c6da02ce02185c208d2fdf7572b5ea1; from 14328aa58ce523a59996c5a82681c43ec048cc33 before c883d0a132d430ef7ebb23fd94323be94d0fbdb8 | CNA record |
References
- https://git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1
- https://git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8
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.