{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-93048", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-17T15:57:05.658Z", "datePublished": "2026-09-17T16:10:39.008Z", "dateUpdated": "2026-10-19T09:04:43.363Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T09:04:43.363Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()\n\nmtd_add_partition() does not reject the special offset value\nMTDPART_OFS_RETAIN (-3), which leads to a WARN_ON in\nadd_mtd_device() when called through the BLKPG ioctl on NAND\ndevices. The RETAIN value depends on cur_offset being the end of\nthe previous partition, but in the dynamic partition path\ncur_offset equals the offset argument itself, causing undefined\nbehavior.\n\nCommit 5daa7b21496a (\"mtd: prepare partition add and del functions\nfor ioctl requests\") introduced mtd_add_partition() and correctly\nrejected MTDPART_OFS_APPEND (-1) and MTDPART_OFS_NXTBLK (-2),\nsince those special offsets rely on cur_offset tracking the\nprevious partition's end. However, commit 1a31368bf92e (\"mtd: add a flags\nfor partitions which should just leave smth. after them\")\nlater added MTDPART_OFS_RETAIN (-3) for the static\npartition table path without updating mtd_add_partition() to\nalso reject this value.\n\nWith offset=-3 passed via BLKPG, the RETAIN size calculation in\nallocate_partition() underflows (parent_size - 0xFFFFFFFFFFFFFFFD\n= parent_size + 3). If the underflow result does not appear to\nleave enough space, allocate_partition() jumps to out_register via\ngoto, skipping erasesize initialization. This results in\nerasesize=0, which triggers:\n\nWARN_ON((!mtd->erasesize || !master->_erase) &&\n\t\t!(mtd->flags & MTD_NO_ERASE))\n\nin add_mtd_device(). If the underflow result appears to leave\nenough space, a bogus partition size is calculated, but the\n\"out of reach\" sanity check catches the invalid offset and\ncreates a disabled empty partition (offset=0, size=0) instead\nof returning an error.\n\nFix this by adding MTDPART_OFS_RETAIN to the rejection list in\nmtd_add_partition(), consistent with the existing handling of\nAPPEND and NXTBLK." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mtd/mtdpart.c" ], "versions": [ { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "701c3ae7273e1adc20db5d97c42e0139b479f16b", "status": "affected", "versionType": "git" }, { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "6aaab2ace3f7b55733d904e5549acf8405f03642", "status": "affected", "versionType": "git" }, { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "181c1bff940e7d3e34ca485d37e3cdbfe409203c", "status": "affected", "versionType": "git" }, { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "a536eb57be58442b19398b2783071007ecfb1735", "status": "affected", "versionType": "git" }, { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "e204e5c49a012f99638633fdbd773e3c86260053", "status": "affected", "versionType": "git" }, { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "398aca2f90122d5abbabff1079deaeb885fe9e40", "status": "affected", "versionType": "git" }, { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "c645f6dd1af2ecc70fd3578e141f2f71fa9e4eff", "status": "affected", "versionType": "git" }, { "version": "1a31368bf92ef2a7da3ba379672c405bd2751df9", "lessThan": "b759d5bb6265419344ee9729fd0dc07ad85719d8", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mtd/mtdpart.c" ], "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.52", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18.52" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.2.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/701c3ae7273e1adc20db5d97c42e0139b479f16b" }, { "url": "https://git.kernel.org/stable/c/6aaab2ace3f7b55733d904e5549acf8405f03642" }, { "url": "https://git.kernel.org/stable/c/181c1bff940e7d3e34ca485d37e3cdbfe409203c" }, { "url": "https://git.kernel.org/stable/c/a536eb57be58442b19398b2783071007ecfb1735" }, { "url": "https://git.kernel.org/stable/c/e204e5c49a012f99638633fdbd773e3c86260053" }, { "url": "https://git.kernel.org/stable/c/398aca2f90122d5abbabff1079deaeb885fe9e40" }, { "url": "https://git.kernel.org/stable/c/c645f6dd1af2ecc70fd3578e141f2f71fa9e4eff" }, { "url": "https://git.kernel.org/stable/c/b759d5bb6265419344ee9729fd0dc07ad85719d8" } ], "title": "mtd: part: reject MTDPART_OFS_RETAIN in mtd_add_partition()", "x_generator": { "engine": "bippy-1.2.0" } } } }