{"cve":"CVE-2026-23234","nvd":{"published":"2026-03-04T15:16:13.790","modified":"2026-06-17T10:21:09.317","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid UAF in f2fs_write_end_io()\n\nAs syzbot reported an use-after-free issue in f2fs_write_end_io().\n\nIt is caused by below race condition:\n\nloop device\t\t\t\tumount\n- worker_thread\n - loop_process_work\n  - do_req_filebacked\n   - lo_rw_aio\n    - lo_rw_aio_complete\n     - blk_mq_end_request\n      - blk_update_request\n       - f2fs_write_end_io\n        - dec_page_count\n        - folio_end_writeback\n\t\t\t\t\t- kill_f2fs_super\n\t\t\t\t\t - kill_block_super\n\t\t\t\t\t  - f2fs_put_super\n\t\t\t\t\t : free(sbi)\n       : get_pages(, F2FS_WB_CP_DATA)\n         accessed sbi which is freed\n\nIn kill_f2fs_super(), we will drop all page caches of f2fs inodes before\ncall free(sbi), it guarantee that all folios should end its writeback, so\nit should be safe to access sbi before last folio_end_writeback().\n\nLet's relocate ckpt thread wakeup flow before folio_end_writeback() to\nresolve this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-416"],"references":["https://git.kernel.org/stable/c/0fb58aff0dafd6837cc91f4154f3ed6e020358fa","https://git.kernel.org/stable/c/2f67ff1e15a8a4d0e4ffc6564ab20d03d7398fe9","https://git.kernel.org/stable/c/505e1c0530db6152cab3feef8e3e4da3d3e358c9","https://git.kernel.org/stable/c/995030be4ce6338c6ff814583c14166446a64008","https://git.kernel.org/stable/c/a42f99be8a16b32a0bb91bb6dda212a6ad61be5d"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:24:17.937441719+00:00"},"epss":{"cve":"CVE-2026-23234","score":0.00137,"percentile":0.03081,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}