{ "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-2023-53692", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2023-53692", "idYear": 2023, "status": "PUBLISHED", "publishedAt": "2025-10-22T13:23:34.702Z", "updatedAt": "2026-08-05T09:15:34.038Z", "importedAt": "2026-10-24T01:57:03.413Z", "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 use-after-free read in ext4_find_extent for bigalloc + inline", "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\next4: fix use-after-free read in ext4_find_extent for bigalloc + inline\n\nSyzbot found the following issue:\nloop0: detected capacity change from 0 to 2048\nEXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 without journal. Quota mode: none.\n==================================================================\nBUG: KASAN: use-after-free in ext4_ext_binsearch_idx fs/ext4/extents.c:768 [inline]\nBUG: KASAN: use-after-free in ext4_find_extent+0x76e/0xd90 fs/ext4/extents.c:931\nRead of size 4 at addr ffff888073644750 by task syz-executor420/5067\n\nCPU: 0 PID: 5067 Comm: syz-executor420 Not tainted 6.2.0-rc1-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n \n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106\n print_address_description+0x74/0x340 mm/kasan/report.c:306\n print_report+0x107/0x1f0 mm/kasan/report.c:417\n kasan_report+0xcd/0x100 mm/kasan/report.c:517\n ext4_ext_binsearch_idx fs/ext4/extents.c:768 [inline]\n ext4_find_extent+0x76e/0xd90 fs/ext4/extents.c:931\n ext4_clu_mapped+0x117/0x970 fs/ext4/extents.c:5809\n ext4_insert_delayed_block fs/ext4/inode.c:1696 [inline]\n ext4_da_map_blocks fs/ext4/inode.c:1806 [inline]\n ext4_da_get_block_prep+0x9e8/0x13c0 fs/ext4/inode.c:1870\n ext4_block_write_begin+0x6a8/0x2290 fs/ext4/inode.c:1098\n ext4_da_write_begin+0x539/0x760 fs/ext4/inode.c:3082\n generic_perform_write+0x2e4/0x5e0 mm/filemap.c:3772\n ext4_buffered_write_iter+0x122/0x3a0 fs/ext4/file.c:285\n ext4_file_write_iter+0x1d0/0x18f0\n call_write_iter include/linux/fs.h:2186 [inline]\n new_sync_write fs/read_write.c:491 [inline]\n vfs_write+0x7dc/0xc50 fs/read_write.c:584\n ksys_write+0x177/0x2a0 fs/read_write.c:637\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x7f4b7a9737b9\nRSP: 002b:00007ffc5cac3668 EFLAGS: 00000246 ORIG_RAX: 0000000000000001\nRAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f4b7a9737b9\nRDX: 00000000175d9003 RSI: 0000000020000200 RDI: 0000000000000004\nRBP: 00007f4b7a933050 R08: 0000000000000000 R09: 0000000000000000\nR10: 000000000000079f R11: 0000000000000246 R12: 00007f4b7a9330e0\nR13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000\n \n\nAbove issue is happens when enable bigalloc and inline data feature. As\ncommit 131294c35ed6 fixed delayed allocation bug in ext4_clu_mapped for\nbigalloc + inline. But it only resolved issue when has inline data, if\ninline data has been converted to extent(ext4_da_convert_inline_data_to_extent)\nbefore writepages, there is no EXT4_STATE_MAY_INLINE_DATA flag. However\ni_data is still store inline data in this scene. Then will trigger UAF\nwhen find extent.\nTo resolve above issue, there is need to add judge \"ext4_has_inline_data(inode)\"\nin ext4_clu_mapped().", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "1ed1eef0551bebee8e56973ccd0900e3578edfb7", "status": "affected", "versionType": "git", "lessThan": "0ce15000dee0ecd6f235f925a327803e2ef489c6" }, { "version": "6f4200ec76a0d31200c308ec5a71c68df5417004", "status": "affected", "versionType": "git", "lessThan": "a34f6dcb78c654ab905642c1b4e7e5fbb4f0babe" }, { "version": "9404839e0c9db5a517ea83c0ca3388b39d105fdf", "status": "affected", "versionType": "git", "lessThan": "770b0613637f59f3091dda1ff0c23671a5326b9c" }, { "version": "d440d6427a5e3a877c1c259b8d2b216ddb65e185", "status": "affected", "versionType": "git", "lessThan": "40566def189c513be2c694681256d7486cc6e368" }, { "version": "81b915181c630ee1cffa052e52874fe4e1ba91ac", "status": "affected", "versionType": "git", "lessThan": "96d440bee177669dc0acedca0abd73bae6a9be8b" }, { "version": "131294c35ed6f777bd4e79d42af13b5c41bf2775", "status": "affected", "versionType": "git", "lessThan": "11c87c8df2cae1d6be83c07e59fef0792de73482" }, { "version": "131294c35ed6f777bd4e79d42af13b5c41bf2775", "status": "affected", "versionType": "git", "lessThan": "14da044725a3ab10affa3566d29c15737c0e67a4" }, { "version": "131294c35ed6f777bd4e79d42af13b5c41bf2775", "status": "affected", "versionType": "git", "lessThan": "835659598c67907b98cd2aa57bb951dfaf675c69" }, { "version": "c0c8edbc8abbe8f16d80a1d794d1ba2c12b6f193", "status": "affected", "versionType": "git" }, { "version": "4.19.270", "status": "affected", "versionType": "semver", "lessThan": "4.19.271" }, { "version": "5.4.229", "status": "affected", "versionType": "semver", "lessThan": "5.4.243" }, { "version": "5.10.163", "status": "affected", "versionType": "semver", "lessThan": "5.10.180" }, { "version": "5.15.87", "status": "affected", "versionType": "semver", "lessThan": "5.15.111" }, { "version": "6.1.4", "status": "affected", "versionType": "semver", "lessThan": "6.1.28" }, { "version": "6.0.18", "status": "affected", "versionType": "semver", "lessThan": "6.1" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "6.2" }, { "version": "4.19.271", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "4.19.*" }, { "version": "5.4.243", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.180", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.111", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.28", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.2.15", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.2.*" }, { "version": "6.3.2", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.3.*" }, { "version": "6.4", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }