{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "278a5fbaed89dacd04e9d052f4594ffd0e0585de"
            },
            {
              "fixed": "fe5bf14881701119aeeda7cf685f3c226c7380df"
            },
            {
              "fixed": "5053581fe5dfb09b58c65dd8462bf5dea71f41ff"
            },
            {
              "fixed": "8cad3b2b3ab81ca55f37405ffd1315bcc2948058"
            },
            {
              "fixed": "dd72ae8b0fce9c0bbe9582b9b50820f0407f8d8a"
            },
            {
              "fixed": "c69d18f0ac7060de724511537810f10f29a27958"
            },
            {
              "fixed": "9a2fa1472083580b6c66bdaf291f591e1170123a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.9.0"
            },
            {
              "fixed": "5.10.225"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.166"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.107"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.48"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.10.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/45xxx/CVE-2024-45025.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE\n\ncopy_fd_bitmaps(new, old, count) is expected to copy the first\ncount/BITS_PER_LONG bits from old-\u003efull_fds_bits[] and fill\nthe rest with zeroes.  What it does is copying enough words\n(BITS_TO_LONGS(count/BITS_PER_LONG)), then memsets the rest.\nThat works fine, *if* all bits past the cutoff point are\nclear.  Otherwise we are risking garbage from the last word\nwe'd copied.\n\nFor most of the callers that is true - expand_fdtable() has\ncount equal to old-\u003emax_fds, so there's no open descriptors\npast count, let alone fully occupied words in -\u003eopen_fds[],\nwhich is what bits in -\u003efull_fds_bits[] correspond to.\n\nThe other caller (dup_fd()) passes sane_fdtable_size(old_fdt, max_fds),\nwhich is the smallest multiple of BITS_PER_LONG that covers all\nopened descriptors below max_fds.  In the common case (copying on\nfork()) max_fds is ~0U, so all opened descriptors will be below\nit and we are fine, by the same reasons why the call in expand_fdtable()\nis safe.\n\nUnfortunately, there is a case where max_fds is less than that\nand where we might, indeed, end up with junk in -\u003efull_fds_bits[] -\nclose_range(from, to, CLOSE_RANGE_UNSHARE) with\n\t* descriptor table being currently shared\n\t* 'to' being above the current capacity of descriptor table\n\t* 'from' being just under some chunk of opened descriptors.\nIn that case we end up with observably wrong behaviour - e.g. spawn\na child with CLONE_FILES, get all descriptors in range 0..127 open,\nthen close_range(64, ~0U, CLOSE_RANGE_UNSHARE) and watch dup(0) ending\nup with descriptor #128, despite #64 being observably not open.\n\nThe minimally invasive fix would be to deal with that in dup_fd().\nIf this proves to add measurable overhead, we can go that way, but\nlet's try to fix copy_fd_bitmaps() first.\n\n* new helper: bitmap_copy_and_expand(to, from, bits_to_copy, size).\n* make copy_fd_bitmaps() take the bitmap size in words, rather than\nbits; it's 'count' argument is always a multiple of BITS_PER_LONG,\nso we are not losing any information, and that way we can use the\nsame helper for all three bitmaps - compiler will see that count\nis a multiple of BITS_PER_LONG for the large ones, so it'll generate\nplain memcpy()+memset().\n\nReproducer added to tools/testing/selftests/core/close_range_test.c",
  "id": "CVE-2024-45025",
  "modified": "2026-08-12T03:51:45.844599864Z",
  "published": "2024-09-11T15:13:57.732Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5053581fe5dfb09b58c65dd8462bf5dea71f41ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8cad3b2b3ab81ca55f37405ffd1315bcc2948058"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a2fa1472083580b6c66bdaf291f591e1170123a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c69d18f0ac7060de724511537810f10f29a27958"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd72ae8b0fce9c0bbe9582b9b50820f0407f8d8a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe5bf14881701119aeeda7cf685f3c226c7380df"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/45xxx/CVE-2024-45025.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-45025"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "fix bitmap corruption on close_range() with CLOSE_RANGE_UNSHARE"
}