{
   "containers": {
      "cna": {
         "providerMetadata": {
            "orgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038"
         },
         "descriptions": [
            {
               "lang": "en",
               "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/kasan: Fix addr error caused by page alignment\n\nIn kasan_init_region, when k_start is not page aligned, at the begin of\nfor loop, k_cur = k_start & PAGE_MASK is less than k_start, and then\n`va = block + k_cur - k_start` is less than block, the addr va is invalid,\nbecause the memory address space from va to block is not alloced by\nmemblock_alloc, which will not be reserved by memblock_reserve later, it\nwill be used by other places.\n\nAs a result, memory overwriting occurs.\n\nfor example:\nint __init __weak kasan_init_region(void *start, size_t size)\n{\n[...]\n\t/* if say block(dcd97000) k_start(feef7400) k_end(feeff3fe) */\n\tblock = memblock_alloc(k_end - k_start, PAGE_SIZE);\n\t[...]\n\tfor (k_cur = k_start & PAGE_MASK; k_cur < k_end; k_cur += PAGE_SIZE) {\n\t\t/* at the begin of for loop\n\t\t * block(dcd97000) va(dcd96c00) k_cur(feef7000) k_start(feef7400)\n\t\t * va(dcd96c00) is less than block(dcd97000), va is invalid\n\t\t */\n\t\tvoid *va = block + k_cur - k_start;\n\t\t[...]\n\t}\n[...]\n}\n\nTherefore, page alignment is performed on k_start before\nmemblock_alloc() to ensure the validity of the VA address."
            }
         ],
         "affected": [
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "unaffected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/powerpc/mm/kasan/init_32.c"
               ],
               "versions": [
                  {
                     "version": "663c0c9496a6",
                     "lessThan": "230e89b5ad0a",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "663c0c9496a6",
                     "lessThan": "2738e0aa2fb2",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "663c0c9496a6",
                     "lessThan": "0c09912dd838",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "663c0c9496a6",
                     "lessThan": "0516c06b19dc",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "663c0c9496a6",
                     "lessThan": "70ef2ba1f428",
                     "status": "affected",
                     "versionType": "git"
                  },
                  {
                     "version": "663c0c9496a6",
                     "lessThan": "4a7aee96200a",
                     "status": "affected",
                     "versionType": "git"
                  }
               ]
            },
            {
               "product": "Linux",
               "vendor": "Linux",
               "defaultStatus": "affected",
               "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
               "programFiles": [
                  "arch/powerpc/mm/kasan/init_32.c"
               ],
               "versions": [
                  {
                     "version": "5.4",
                     "status": "affected"
                  },
                  {
                     "version": "0",
                     "lessThan": "5.4",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.10.210",
                     "lessThanOrEqual": "5.10.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "5.15.149",
                     "lessThanOrEqual": "5.15.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.1.79",
                     "lessThanOrEqual": "6.1.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.6.18",
                     "lessThanOrEqual": "6.6.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.7.6",
                     "lessThanOrEqual": "6.7.*",
                     "status": "unaffected",
                     "versionType": "custom"
                  },
                  {
                     "version": "6.8",
                     "lessThanOrEqual": "*",
                     "status": "unaffected",
                     "versionType": "original_commit_for_fix"
                  }
               ]
            }
         ],
         "references": [
            {
               "url": "https://git.kernel.org/stable/c/230e89b5ad0a33f530a2a976b3e5e4385cb27882"
            },
            {
               "url": "https://git.kernel.org/stable/c/2738e0aa2fb24a7ab9c878d912dc2b239738c6c6"
            },
            {
               "url": "https://git.kernel.org/stable/c/0c09912dd8387e228afcc5e34ac5d79b1e3a1058"
            },
            {
               "url": "https://git.kernel.org/stable/c/0516c06b19dc64807c10e01bb99b552bdf2d7dbe"
            },
            {
               "url": "https://git.kernel.org/stable/c/70ef2ba1f4286b2b73675aeb424b590c92d57b25"
            },
            {
               "url": "https://git.kernel.org/stable/c/4a7aee96200ad281a5cc4cf5c7a2e2a49d2b97b0"
            }
         ],
         "title": "powerpc/kasan: Fix addr error caused by page alignment",
         "x_generator": {
            "engine": "bippy-a5840b7849dd"
         }
      }
   },
   "cveMetadata": {
      "assignerOrgId": "f4215fc3-5b6b-47ff-a258-f7189bd81038",
      "cveID": "CVE-2024-26712",
      "requesterUserId": "gregkh@kernel.org",
      "serial": "1",
      "state": "PUBLISHED"
   },
   "dataType": "CVE_RECORD",
   "dataVersion": "5.0"
}