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mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()

Type: advisorySource: Official CVE List1 source record

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 ("mtd: prepare partition add and del functions for ioctl requests") 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's end. However, commit 1a31368bf92e ("mtd: add a flags for partitions which should just leave smth. after them") 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 + 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->erasesize || !master->_erase) && !(mtd->flags & MTD_NO_ERASE)) in add_mtd_device(). If the underflow result appears

Announced Source revision 1
Original source ↗

CVE-2026-93048

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-93048

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "701c3ae7273e1adc20db5d97c42e0139b479f16b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "6aaab2ace3f7b55733d904e5549acf8405f03642",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "181c1bff940e7d3e34ca485d37e3cdbfe409203c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "a536eb57be58442b19398b2783071007ecfb1735",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "e204e5c49a012f99638633fdbd773e3c86260053",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "398aca2f90122d5abbabff1079deaeb885fe9e40",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "c645f6dd1af2ecc70fd3578e141f2f71fa9e4eff",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9",
        "lessThan": "b759d5bb6265419344ee9729fd0dc07ad85719d8",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/mtd/mtdpart.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.2"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.2",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/mtd/mtdpart.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-93048

Source reference: /cveMetadata/cveId

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Event
#37784 · Revision 1
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