{"cve":"CVE-2023-53826","nvd":{"published":"2025-12-09T16:17:21.457","modified":"2026-06-17T06:46:08.393","status":"Deferred","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show()\n\nWear-leveling entry could be freed in error path, which may be accessed\nagain in eraseblk_count_seq_show(), for example:\n\n__erase_worker                eraseblk_count_seq_show\n                                wl = ubi->lookuptbl[*block_number]\n\t\t\t\tif (wl)\n  wl_entry_destroy\n    ubi->lookuptbl[e->pnum] = NULL\n    kmem_cache_free(ubi_wl_entry_slab, e)\n\t\t                   erase_count = wl->ec  // UAF!\n\nWear-leveling entry updating/accessing in ubi->lookuptbl should be\nprotected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize\nwl entry accessing between wl_entry_destroy() and\neraseblk_count_seq_show().\n\nFetch a reproducer in [Link].","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38","https://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845","https://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12","https://git.kernel.org/stable/c/84250da1c63cb7d421a3b4812b5c2ce2e47d31a1","https://git.kernel.org/stable/c/84253f3c2dad6be10d30c92626c763d9a9f512ad"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:16:40.427100871+00:00"},"epss":{"cve":"CVE-2023-53826","score":0.0025,"percentile":0.16421,"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."]}