{"id":"CVE-2023-53481","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nubi: ubi_wl_put_peb: Fix infinite loop when wear-leveling work failed\n\nFollowing process will trigger an infinite loop in ubi_wl_put_peb():\n\n\tubifs_bgt\t\tubi_bgt\nubifs_l…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nubi: ubi_wl_put_peb: Fix infinite loop when wear-leveling work failed\n\nFollowing process will trigger an infinite loop in ubi_wl_put_peb():\n\n\tubifs_bgt\t\tubi_bgt\nubifs_l…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-835"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 2.6.25, < 4.14.308","linux_kernel >= 4.15, < 4.19.276","linux_kernel >= 4.20, < 5.4.235","linux_kernel >= 5.5, < 5.10.173","linux_kernel >= 5.11, < 5.15.100","linux_kernel >= 5.16, < 6.1.18","linux_kernel >= 6.2, < 6.2.5"],"patched":["linux_kernel 6.2.5"],"published":"2025-10-01","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:40.303","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53481","references":[{"url":"https://git.kernel.org/stable/c/3afaaf6f5867dc4ad383808d4053f428ec7b867d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4d57a7333e26040f2b583983e1970d9d460e56b0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5af1c643184a5d09ff5b3f334077a4d0a163c677","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8a18856e074479bd050b01e688c58defadce7ab0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b40d2fbf47af58377e898b5062077a47bb28a132","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b5be23f6ae610bdb262160a1f294afee6d0e6a69","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cc4bc532acda66189bddc03b3fe1ad689d9a48a2","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f006f596fe851c3b6aae60b79f89f89f0e515d2f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00164,"epssPercentile":0.05517,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:34:44.820023Z"},"ingestedAt":"2026-10-15T22:48:25.403Z","slug":"CVE-2023-53481","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nubi: ubi_wl_put_peb: Fix infinite loop when wear-leveling work failed\n\nFollowing process will trigger an infinite loop in ubi_wl_put_peb():\n\n\tubifs_bgt\t\tubi_bgt\nubifs_leb_unmap\n  ubi_leb_unmap\n    ubi_eba_unmap_leb\n      ubi_wl_put_peb\twear_leveling_worker\n                          e1 = rb_entry(rb_first(&ubi->used)\n\t\t\t  e2 = get_peb_for_wl(ubi)\n\t\t\t  ubi_io_read_vid_hdr  // return err (flash fault)\n\t\t\t  out_error:\n\t\t\t    ubi->move_from = ubi->move_to = NULL\n\t\t\t    wl_entry_destroy(ubi, e1)\n\t\t\t      ubi->lookuptbl[e->pnum] = NULL\n      retry:\n        e = ubi->lookuptbl[pnum];\t// return NULL\n\tif (e == ubi->move_from) {\t// NULL == NULL gets true\n\t  goto retry;\t\t\t// infinite loop !!!\n\n$ top\n  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     COMMAND\n  7676 root     20   0       0      0      0 R 100.0  0.0  ubifs_bgt0_0\n\nFix it by:\n 1) Letting ubi_wl_put_peb() returns directly if wearl leveling entry has\n    been removed from 'ubi->lookuptbl'.\n 2) Using 'ubi->wl_lock' protecting wl entry deletion to preventing an\n    use-after-free problem for wl entry in ubi_wl_put_peb().\n\nFetch a reproducer in [Link].\n\n## Affected\n\n- `linux_kernel >= 2.6.25, < 4.14.308`\n- `linux_kernel >= 4.15, < 4.19.276`\n- `linux_kernel >= 4.20, < 5.4.235`\n- `linux_kernel >= 5.5, < 5.10.173`\n- `linux_kernel >= 5.11, < 5.15.100`\n- `linux_kernel >= 5.16, < 6.1.18`\n- `linux_kernel >= 6.2, < 6.2.5`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.2.5`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}