CVE-2022-50638 (GCVE-0-2022-50638)

Vulnerability from cvelistv5 – Published: 2025-12-09 00:00 – Updated: 2026-05-11 19:22
VLAI
Title
ext4: fix bug_on in __es_tree_search caused by bad boot loader inode
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: fix bug_on in __es_tree_search caused by bad boot loader inode We got a issue as fllows: ================================================================== kernel BUG at fs/ext4/extents_status.c:203! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 1 PID: 945 Comm: cat Not tainted 6.0.0-next-20221007-dirty #349 RIP: 0010:ext4_es_end.isra.0+0x34/0x42 RSP: 0018:ffffc9000143b768 EFLAGS: 00010203 RAX: 0000000000000000 RBX: ffff8881769cd0b8 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8fc27cf7 RDI: 00000000ffffffff RBP: ffff8881769cd0bc R08: 0000000000000000 R09: ffffc9000143b5f8 R10: 0000000000000001 R11: 0000000000000001 R12: ffff8881769cd0a0 R13: ffff8881768e5668 R14: 00000000768e52f0 R15: 0000000000000000 FS: 00007f359f7f05c0(0000)GS:ffff88842fd00000(0000)knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f359f5a2000 CR3: 000000017130c000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> __es_tree_search.isra.0+0x6d/0xf5 ext4_es_cache_extent+0xfa/0x230 ext4_cache_extents+0xd2/0x110 ext4_find_extent+0x5d5/0x8c0 ext4_ext_map_blocks+0x9c/0x1d30 ext4_map_blocks+0x431/0xa50 ext4_mpage_readpages+0x48e/0xe40 ext4_readahead+0x47/0x50 read_pages+0x82/0x530 page_cache_ra_unbounded+0x199/0x2a0 do_page_cache_ra+0x47/0x70 page_cache_ra_order+0x242/0x400 ondemand_readahead+0x1e8/0x4b0 page_cache_sync_ra+0xf4/0x110 filemap_get_pages+0x131/0xb20 filemap_read+0xda/0x4b0 generic_file_read_iter+0x13a/0x250 ext4_file_read_iter+0x59/0x1d0 vfs_read+0x28f/0x460 ksys_read+0x73/0x160 __x64_sys_read+0x1e/0x30 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> ================================================================== In the above issue, ioctl invokes the swap_inode_boot_loader function to swap inode<5> and inode<12>. However, inode<5> contain incorrect imode and disordered extents, and i_nlink is set to 1. The extents check for inode in the ext4_iget function can be bypassed bacause 5 is EXT4_BOOT_LOADER_INO. While links_count is set to 1, the extents are not initialized in swap_inode_boot_loader. After the ioctl command is executed successfully, the extents are swapped to inode<12>, in this case, run the `cat` command to view inode<12>. And Bug_ON is triggered due to the incorrect extents. When the boot loader inode is not initialized, its imode can be one of the following: 1) the imode is a bad type, which is marked as bad_inode in ext4_iget and set to S_IFREG. 2) the imode is good type but not S_IFREG. 3) the imode is S_IFREG. The BUG_ON may be triggered by bypassing the check in cases 1 and 2. Therefore, when the boot loader inode is bad_inode or its imode is not S_IFREG, initialize the inode to avoid triggering the BUG.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < e76ede9d2c9e0af4573342b56d7cdbf757c18084 (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < a95ba369255ddcdc5e43d38bc5203537bdf3a518 (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 5f8d36abd2059bf1bd016b17d1fe78d8613deddd (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 78e335fb573e6a85718c4c24d5a052718a99a9ed (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 71e99ec1315fe98d322b17b9a28f204aaf15ffee (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < d480a49c15c465cb9a16db1379f4996e9b5bb9cc (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < feec0ea94c5ef4aa118750284c8a921698733ef2 (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < a125c8806b7d3c3815b6f9f59d395b9d7527b0ef (git)
Affected: 393d1d1d76933886d5e1ce603214c9987589c6d5 , < 991ed014de0840c5dc405b679168924afb2952ac (git)
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Linux Linux Affected: 3.10
Unaffected: 0 , < 3.10 (semver)
Unaffected: 4.9.337 , ≤ 4.9.* (semver)
Unaffected: 4.14.303 , ≤ 4.14.* (semver)
Unaffected: 4.19.270 , ≤ 4.19.* (semver)
Unaffected: 5.4.229 , ≤ 5.4.* (semver)
Unaffected: 5.10.163 , ≤ 5.10.* (semver)
Unaffected: 5.15.87 , ≤ 5.15.* (semver)
Unaffected: 6.0.18 , ≤ 6.0.* (semver)
Unaffected: 6.1.4 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug_on in __es_tree_search caused by bad boot loader inode\n\nWe got a issue as fllows:\n==================================================================\n kernel BUG at fs/ext4/extents_status.c:203!\n invalid opcode: 0000 [#1] PREEMPT SMP\n CPU: 1 PID: 945 Comm: cat Not tainted 6.0.0-next-20221007-dirty #349\n RIP: 0010:ext4_es_end.isra.0+0x34/0x42\n RSP: 0018:ffffc9000143b768 EFLAGS: 00010203\n RAX: 0000000000000000 RBX: ffff8881769cd0b8 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: ffffffff8fc27cf7 RDI: 00000000ffffffff\n RBP: ffff8881769cd0bc R08: 0000000000000000 R09: ffffc9000143b5f8\n R10: 0000000000000001 R11: 0000000000000001 R12: ffff8881769cd0a0\n R13: ffff8881768e5668 R14: 00000000768e52f0 R15: 0000000000000000\n FS: 00007f359f7f05c0(0000)GS:ffff88842fd00000(0000)knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f359f5a2000 CR3: 000000017130c000 CR4: 00000000000006e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n  \u003cTASK\u003e\n  __es_tree_search.isra.0+0x6d/0xf5\n  ext4_es_cache_extent+0xfa/0x230\n  ext4_cache_extents+0xd2/0x110\n  ext4_find_extent+0x5d5/0x8c0\n  ext4_ext_map_blocks+0x9c/0x1d30\n  ext4_map_blocks+0x431/0xa50\n  ext4_mpage_readpages+0x48e/0xe40\n  ext4_readahead+0x47/0x50\n  read_pages+0x82/0x530\n  page_cache_ra_unbounded+0x199/0x2a0\n  do_page_cache_ra+0x47/0x70\n  page_cache_ra_order+0x242/0x400\n  ondemand_readahead+0x1e8/0x4b0\n  page_cache_sync_ra+0xf4/0x110\n  filemap_get_pages+0x131/0xb20\n  filemap_read+0xda/0x4b0\n  generic_file_read_iter+0x13a/0x250\n  ext4_file_read_iter+0x59/0x1d0\n  vfs_read+0x28f/0x460\n  ksys_read+0x73/0x160\n  __x64_sys_read+0x1e/0x30\n  do_syscall_64+0x35/0x80\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n  \u003c/TASK\u003e\n==================================================================\n\nIn the above issue, ioctl invokes the swap_inode_boot_loader function to\nswap inode\u003c5\u003e and inode\u003c12\u003e. However, inode\u003c5\u003e contain incorrect imode and\ndisordered extents, and i_nlink is set to 1. The extents check for inode in\nthe ext4_iget function can be bypassed bacause 5 is EXT4_BOOT_LOADER_INO.\nWhile links_count is set to 1, the extents are not initialized in\nswap_inode_boot_loader. After the ioctl command is executed successfully,\nthe extents are swapped to inode\u003c12\u003e, in this case, run the `cat` command\nto view inode\u003c12\u003e. And Bug_ON is triggered due to the incorrect extents.\n\nWhen the boot loader inode is not initialized, its imode can be one of the\nfollowing:\n1) the imode is a bad type, which is marked as bad_inode in ext4_iget and\n   set to S_IFREG.\n2) the imode is good type but not S_IFREG.\n3) the imode is S_IFREG.\n\nThe BUG_ON may be triggered by bypassing the check in cases 1 and 2.\nTherefore, when the boot loader inode is bad_inode or its imode is not\nS_IFREG, initialize the inode to avoid triggering the BUG."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T19:22:43.123Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e76ede9d2c9e0af4573342b56d7cdbf757c18084"
        },
        {
          "url": "https://git.kernel.org/stable/c/a95ba369255ddcdc5e43d38bc5203537bdf3a518"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f8d36abd2059bf1bd016b17d1fe78d8613deddd"
        },
        {
          "url": "https://git.kernel.org/stable/c/78e335fb573e6a85718c4c24d5a052718a99a9ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/71e99ec1315fe98d322b17b9a28f204aaf15ffee"
        },
        {
          "url": "https://git.kernel.org/stable/c/d480a49c15c465cb9a16db1379f4996e9b5bb9cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/feec0ea94c5ef4aa118750284c8a921698733ef2"
        },
        {
          "url": "https://git.kernel.org/stable/c/a125c8806b7d3c3815b6f9f59d395b9d7527b0ef"
        },
        {
          "url": "https://git.kernel.org/stable/c/991ed014de0840c5dc405b679168924afb2952ac"
        }
      ],
      "title": "ext4: fix bug_on in __es_tree_search caused by bad boot loader inode",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50638",
    "datePublished": "2025-12-09T00:00:11.665Z",
    "dateReserved": "2025-12-08T23:57:43.370Z",
    "dateUpdated": "2026-05-11T19:22:43.123Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "cve": "CVE-2022-50638",
      "date": "2026-09-27",
      "epss": "0.00243",
      "percentile": "0.13952"
    },
    "nvd": {
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                    "status": "unaffected",
                    "version": "6.1.4",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.2",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix bug_on in __es_tree_search caused by bad boot loader inode\n\nWe got a issue as fllows:\n==================================================================\n kernel BUG at fs/ext4/extents_status.c:203!\n invalid opcode: 0000 [#1] PREEMPT SMP\n CPU: 1 PID: 945 Comm: cat Not tainted 6.0.0-next-20221007-dirty #349\n RIP: 0010:ext4_es_end.isra.0+0x34/0x42\n RSP: 0018:ffffc9000143b768 EFLAGS: 00010203\n RAX: 0000000000000000 RBX: ffff8881769cd0b8 RCX: 0000000000000000\n RDX: 0000000000000000 RSI: ffffffff8fc27cf7 RDI: 00000000ffffffff\n RBP: ffff8881769cd0bc R08: 0000000000000000 R09: ffffc9000143b5f8\n R10: 0000000000000001 R11: 0000000000000001 R12: ffff8881769cd0a0\n R13: ffff8881768e5668 R14: 00000000768e52f0 R15: 0000000000000000\n FS: 00007f359f7f05c0(0000)GS:ffff88842fd00000(0000)knlGS:0000000000000000\n CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n CR2: 00007f359f5a2000 CR3: 000000017130c000 CR4: 00000000000006e0\n DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\n DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\n Call Trace:\n  \u003cTASK\u003e\n  __es_tree_search.isra.0+0x6d/0xf5\n  ext4_es_cache_extent+0xfa/0x230\n  ext4_cache_extents+0xd2/0x110\n  ext4_find_extent+0x5d5/0x8c0\n  ext4_ext_map_blocks+0x9c/0x1d30\n  ext4_map_blocks+0x431/0xa50\n  ext4_mpage_readpages+0x48e/0xe40\n  ext4_readahead+0x47/0x50\n  read_pages+0x82/0x530\n  page_cache_ra_unbounded+0x199/0x2a0\n  do_page_cache_ra+0x47/0x70\n  page_cache_ra_order+0x242/0x400\n  ondemand_readahead+0x1e8/0x4b0\n  page_cache_sync_ra+0xf4/0x110\n  filemap_get_pages+0x131/0xb20\n  filemap_read+0xda/0x4b0\n  generic_file_read_iter+0x13a/0x250\n  ext4_file_read_iter+0x59/0x1d0\n  vfs_read+0x28f/0x460\n  ksys_read+0x73/0x160\n  __x64_sys_read+0x1e/0x30\n  do_syscall_64+0x35/0x80\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n  \u003c/TASK\u003e\n==================================================================\n\nIn the above issue, ioctl invokes the swap_inode_boot_loader function to\nswap inode\u003c5\u003e and inode\u003c12\u003e. However, inode\u003c5\u003e contain incorrect imode and\ndisordered extents, and i_nlink is set to 1. The extents check for inode in\nthe ext4_iget function can be bypassed bacause 5 is EXT4_BOOT_LOADER_INO.\nWhile links_count is set to 1, the extents are not initialized in\nswap_inode_boot_loader. After the ioctl command is executed successfully,\nthe extents are swapped to inode\u003c12\u003e, in this case, run the `cat` command\nto view inode\u003c12\u003e. And Bug_ON is triggered due to the incorrect extents.\n\nWhen the boot loader inode is not initialized, its imode can be one of the\nfollowing:\n1) the imode is a bad type, which is marked as bad_inode in ext4_iget and\n   set to S_IFREG.\n2) the imode is good type but not S_IFREG.\n3) the imode is S_IFREG.\n\nThe BUG_ON may be triggered by bypassing the check in cases 1 and 2.\nTherefore, when the boot loader inode is bad_inode or its imode is not\nS_IFREG, initialize the inode to avoid triggering the BUG."
          }
        ],
        "id": "CVE-2022-50638",
        "lastModified": "2026-06-17T05:23:54.737",
        "metrics": {},
        "published": "2025-12-09T01:16:46.120",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/5f8d36abd2059bf1bd016b17d1fe78d8613deddd"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/71e99ec1315fe98d322b17b9a28f204aaf15ffee"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/78e335fb573e6a85718c4c24d5a052718a99a9ed"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/991ed014de0840c5dc405b679168924afb2952ac"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a125c8806b7d3c3815b6f9f59d395b9d7527b0ef"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a95ba369255ddcdc5e43d38bc5203537bdf3a518"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/d480a49c15c465cb9a16db1379f4996e9b5bb9cc"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e76ede9d2c9e0af4573342b56d7cdbf757c18084"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/feec0ea94c5ef4aa118750284c8a921698733ef2"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:55:33+00:00",
      "cve": "CVE-2022-50638",
      "id": "CVE-2022-50638",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "399",
      "product_status:known_affected": "80",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: fix bug_on in __es_tree_search caused by bad boot loader inode",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50638.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-06T23:47:35Z",
      "cve": "CVE-2022-50638",
      "id": "CVE-2022-50638",
      "initial_release_date": "2025-12-10T00:39:15Z",
      "product_status:known_affected": "548",
      "product_status:known_not_affected": "173",
      "product_status:recommended": "282",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50638",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50638.json",
      "version": "28"
    }
  }
}



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