{
  "cveId": "CVE-2026-89793",
  "url": "https://patchblox.com/security/cve/CVE-2026-89793",
  "summary": "CVE-2026-89793 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2026-89793, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "ublk: clear VM_MAYWRITE on read-only ublk char device mmap",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  ublk: clear VM_MAYWRITE on read-only ublk char device mmap  ublk_ch_mmap() rejects mmap requests with VM_WRITE set, but never clears VM_MAYWRITE on the resulting read-only mapping. This allows a userspace daemon to mmap the per-queue command buffer PROT_READ, then upgrade it to PROT_WRITE via mprotect(), since VM_MAYWRITE was never cleared.  The command buffer holds struct ublksrv_io_desc entries that are kernel-written ABI; a writable mapping lets an unprivileged daemon process corrupt fields such as addr, op_flags, nr_sectors, and start_sector.  Same bug class as the drm/panthor and drm/vc4 VM_MAYWRITE fixes, and the 2026-08-13 ptp/vmclock fix (a5edadbae57e).  Verified via mprotect() PoC: before the fix, a PROT_READ mapping can be upgraded to PROT_READ|PROT_WRITE and a write into the command buffer corrupts io_desc fields (confirmed under KASAN). After the fix, mprotect() returns -EACCES.",
  "published": "2026-09-16T10:16:55Z",
  "severity": "Important",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00168,
  "epssPercentile": 0.06138,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89793",
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