{
  "cveId": "CVE-2026-93048",
  "url": "https://patchblox.com/security/cve/CVE-2026-93048",
  "summary": "CVE-2026-93048 is fixed in 84 products on 1 platform, first by DEBIAN-CVE-2026-93048, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()  mtd_add_partition() does not reject the special offset value MTDPART_OFS_RETAIN (-3), which leads to a WARN_ON in add_mtd_device() when called through the BLKPG ioctl on NAND devices. The RETAIN value depends on cur_offset being the end of the previous partition, but in the dynamic partition path cur_offset equals the offset argument itself, causing undefined behavior.  Commit 5daa7b21496a (\u0022mtd: prepare partition add and del functions for ioctl requests\u0022) introduced mtd_add_partition() and correctly rejected MTDPART_OFS_APPEND (-1) and MTDPART_OFS_NXTBLK (-2), since those special offsets rely on cur_offset tracking the previous partition\u0027s end. However, commit 1a31368bf92e (\u0022mtd: add a flags for partitions which should just leave smth. after them\u0022) later added MTDPART_OFS_RETAIN (-3) for the static partition table path without updating mtd_add_partition() to also reject this value.  With offset=-3 passed via BLKPG, the RETAIN size calculation in allocate_partition() underflows (parent_size - 0xFFFFFFFFFFFFFFFD = parent_size \u002B 3). If the underflow result does not appear to leave enough space, allocate_partition() jumps to out_register via goto, skipping erasesize initialization. This results in erasesize=0, which triggers:  WARN_ON((!mtd-\u003Eerasesize || !master-\u003E_erase) \u0026\u0026 \t\t!(mtd-\u003Eflags \u0026 MTD_NO_ERASE))  in add_mtd_device(). If the underflow result appears to leave enough space, a bogus partition size is calculated, but the \u0022out of reach\u0022 sanity check catches the invalid offset and creates a disabled empty partition (offset=0, size=0) instead of returning an error.  Fix this by adding MTDPART_OFS_RETAIN to the rejection list in mtd_add_partition(), consistent with the existing handling of APPEND and NXTBLK.",
  "published": "2026-09-17T17:17:58Z",
  "severity": "Moderate",
  "cvss": 5.5,
  "epss": 0.00216,
  "epssPercentile": 0.12149,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93048",
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}