CVE-2026-74635: fbdev: bitblit: bound-check glyph index in bit_cursor()
CSIRTS triage
- What
- Missing bounds check on glyph index in the bitblit framebuffer cursor rendering function.
- Who is affected
- Systems running vulnerable Linux kernel versions with framebuffer bitblit driver active.
- Urgency
- Medium priority; not currently exploited but out-of-bounds access can cause memory corruption or DoS.
- Action
- Apply kernel patch adding glyph index bounds checking in fbdev/core/bitblit.c or update to patched kernel version.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-74635
Exploitation outlook
EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.
- Low exploitation riskCVE-2026-746350.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-74635 | coverage & exploitation status | NVD · CVE.org |
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