{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2022-50638", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-50638", "idYear": 2022, "status": "PUBLISHED", "publishedAt": "2025-12-09T00:00:11.665Z", "updatedAt": "2026-05-11T19:22:43.123Z", "importedAt": "2026-10-24T01:56:49.724Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "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:\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 \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 \n==================================================================\n\nIn the above issue, ioctl invokes the swap_inode_boot_loader function to\nswap inode<5> and inode<12>. However, inode<5> 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<12>, in this case, run the `cat` command\nto view inode<12>. 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.", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "e76ede9d2c9e0af4573342b56d7cdbf757c18084" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "a95ba369255ddcdc5e43d38bc5203537bdf3a518" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "5f8d36abd2059bf1bd016b17d1fe78d8613deddd" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "78e335fb573e6a85718c4c24d5a052718a99a9ed" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "71e99ec1315fe98d322b17b9a28f204aaf15ffee" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "d480a49c15c465cb9a16db1379f4996e9b5bb9cc" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "feec0ea94c5ef4aa118750284c8a921698733ef2" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "a125c8806b7d3c3815b6f9f59d395b9d7527b0ef" }, { "version": "393d1d1d76933886d5e1ce603214c9987589c6d5", "status": "affected", "versionType": "git", "lessThan": "991ed014de0840c5dc405b679168924afb2952ac" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "3.10", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "3.10" }, { "version": "4.9.337", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.9.*" }, { "version": "4.14.303", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.14.*" }, { "version": "4.19.270", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.229", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.163", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.87", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.0.18", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.0.*" }, { "version": "6.1.4", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }