CVE-2025-37779 (GCVE-0-2025-37779)

Vulnerability from cvelistv5 – Published: 2025-05-01 13:07 – Updated: 2025-05-26 05:20
VLAI?
Title
lib/iov_iter: fix to increase non slab folio refcount
Summary
In the Linux kernel, the following vulnerability has been resolved: lib/iov_iter: fix to increase non slab folio refcount When testing EROFS file-backed mount over v9fs on qemu, I encountered a folio UAF issue. The page sanity check reports the following call trace. The root cause is that pages in bvec are coalesced across a folio bounary. The refcount of all non-slab folios should be increased to ensure p9_releas_pages can put them correctly. BUG: Bad page state in process md5sum pfn:18300 page: refcount:0 mapcount:0 mapping:00000000d5ad8e4e index:0x60 pfn:0x18300 head: order:0 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0 aops:z_erofs_aops ino:30b0f dentry name(?):"GoogleExtServicesCn.apk" flags: 0x100000000000041(locked|head|node=0|zone=1) raw: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0 raw: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000 head: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0 head: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000 head: 0100000000000000 0000000000000000 ffffffffffffffff 0000000000000000 head: 0000000000000010 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set Call Trace: dump_stack_lvl+0x53/0x70 bad_page+0xd4/0x220 __free_pages_ok+0x76d/0xf30 __folio_put+0x230/0x320 p9_release_pages+0x179/0x1f0 p9_virtio_zc_request+0xa2a/0x1230 p9_client_zc_rpc.constprop.0+0x247/0x700 p9_client_read_once+0x34d/0x810 p9_client_read+0xf3/0x150 v9fs_issue_read+0x111/0x360 netfs_unbuffered_read_iter_locked+0x927/0x1390 netfs_unbuffered_read_iter+0xa2/0xe0 vfs_iocb_iter_read+0x2c7/0x460 erofs_fileio_rq_submit+0x46b/0x5b0 z_erofs_runqueue+0x1203/0x21e0 z_erofs_readahead+0x579/0x8b0 read_pages+0x19f/0xa70 page_cache_ra_order+0x4ad/0xb80 filemap_readahead.isra.0+0xe7/0x150 filemap_get_pages+0x7aa/0x1890 filemap_read+0x320/0xc80 vfs_read+0x6c6/0xa30 ksys_read+0xf9/0x1c0 do_syscall_64+0x9e/0x1a0 entry_SYSCALL_64_after_hwframe+0x71/0x79
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: b9c0e49abfca06f1a109acea834bcfc934f33f76 , < d833f21162c4d536d729628f8cf1ee8d4110f2b7 (git)
Affected: b9c0e49abfca06f1a109acea834bcfc934f33f76 , < 770c8d55c42868239c748a3ebc57c9e37755f842 (git)
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    Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.14.4 , ≤ 6.14.* (semver)
Unaffected: 6.15 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "lib/iov_iter.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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            {
              "lessThan": "770c8d55c42868239c748a3ebc57c9e37755f842",
              "status": "affected",
              "version": "b9c0e49abfca06f1a109acea834bcfc934f33f76",
              "versionType": "git"
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        {
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          "product": "Linux",
          "programFiles": [
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          "vendor": "Linux",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.15",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.14.4",
                  "versionStartIncluding": "6.14",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.15",
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                  "vulnerable": true
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              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nlib/iov_iter: fix to increase non slab folio refcount\n\nWhen testing EROFS file-backed mount over v9fs on qemu, I encountered a\nfolio UAF issue.  The page sanity check reports the following call trace. \nThe root cause is that pages in bvec are coalesced across a folio bounary.\nThe refcount of all non-slab folios should be increased to ensure\np9_releas_pages can put them correctly.\n\nBUG: Bad page state in process md5sum  pfn:18300\npage: refcount:0 mapcount:0 mapping:00000000d5ad8e4e index:0x60 pfn:0x18300\nhead: order:0 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0\naops:z_erofs_aops ino:30b0f dentry name(?):\"GoogleExtServicesCn.apk\"\nflags: 0x100000000000041(locked|head|node=0|zone=1)\nraw: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0\nraw: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000\nhead: 0100000000000041 dead000000000100 dead000000000122 ffff888014b13bd0\nhead: 0000000000000060 0000000000000020 00000000ffffffff 0000000000000000\nhead: 0100000000000000 0000000000000000 ffffffffffffffff 0000000000000000\nhead: 0000000000000010 0000000000000000 00000000ffffffff 0000000000000000\npage dumped because: PAGE_FLAGS_CHECK_AT_FREE flag(s) set\nCall Trace:\n dump_stack_lvl+0x53/0x70\n bad_page+0xd4/0x220\n __free_pages_ok+0x76d/0xf30\n __folio_put+0x230/0x320\n p9_release_pages+0x179/0x1f0\n p9_virtio_zc_request+0xa2a/0x1230\n p9_client_zc_rpc.constprop.0+0x247/0x700\n p9_client_read_once+0x34d/0x810\n p9_client_read+0xf3/0x150\n v9fs_issue_read+0x111/0x360\n netfs_unbuffered_read_iter_locked+0x927/0x1390\n netfs_unbuffered_read_iter+0xa2/0xe0\n vfs_iocb_iter_read+0x2c7/0x460\n erofs_fileio_rq_submit+0x46b/0x5b0\n z_erofs_runqueue+0x1203/0x21e0\n z_erofs_readahead+0x579/0x8b0\n read_pages+0x19f/0xa70\n page_cache_ra_order+0x4ad/0xb80\n filemap_readahead.isra.0+0xe7/0x150\n filemap_get_pages+0x7aa/0x1890\n filemap_read+0x320/0xc80\n vfs_read+0x6c6/0xa30\n ksys_read+0xf9/0x1c0\n do_syscall_64+0x9e/0x1a0\n entry_SYSCALL_64_after_hwframe+0x71/0x79"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-26T05:20:42.641Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d833f21162c4d536d729628f8cf1ee8d4110f2b7"
        },
        {
          "url": "https://git.kernel.org/stable/c/770c8d55c42868239c748a3ebc57c9e37755f842"
        }
      ],
      "title": "lib/iov_iter: fix to increase non slab folio refcount",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-37779",
    "datePublished": "2025-05-01T13:07:17.106Z",
    "dateReserved": "2025-04-16T04:51:23.940Z",
    "dateUpdated": "2025-05-26T05:20:42.641Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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