CVE-2023-53481
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
ubi: ubi_wl_put_peb: Fix infinite loop when wear-leveling work failed
Following process will trigger an infinite loop in ubi_wl_put_peb():
Fix it by: 1) Letting ubi_wl_put_peb() returns directly if wearl leveling entry has been removed from 'ubi->lookuptbl'. 2) Using 'ubi->wl_lock' protecting wl entry deletion to preventing an use-after-free problem for wl entry in ubi_wl_put_peb().
Fetch a reproducer in [Link].
Detalles técnicos trazas, registros y código del informe original
ubifs_bgt ubi_bgt
ubifs_leb_unmap
ubi_leb_unmap
ubi_eba_unmap_leb
ubi_wl_put_peb wear_leveling_worker
e1 = rb_entry(rb_first(&ubi->used)
e2 = get_peb_for_wl(ubi)
ubi_io_read_vid_hdr // return err (flash fault)
out_error:
ubi->move_from = ubi->move_to = NULL
wl_entry_destroy(ubi, e1)
ubi->lookuptbl[e->pnum] = NULL
retry:
e = ubi->lookuptbl[pnum]; // return NULL
if (e == ubi->move_from) { // NULL == NULL gets true
goto retry; // infinite loop !!!
$ top
PID USER PR NI VIRT RES SHR S %CPU %MEM COMMAND
7676 root 20 0 0 0 0 R 100.0 0.0 ubifs_bgt0_0CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.16%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (1)
CWE
- CWE-835
Referencias
- https://git.kernel.org/stable/c/3afaaf6f5867dc4ad383808d4053f428ec7b867d
- https://git.kernel.org/stable/c/4d57a7333e26040f2b583983e1970d9d460e56b0
- https://git.kernel.org/stable/c/5af1c643184a5d09ff5b3f334077a4d0a163c677
- https://git.kernel.org/stable/c/8a18856e074479bd050b01e688c58defadce7ab0
- https://git.kernel.org/stable/c/b40d2fbf47af58377e898b5062077a47bb28a132
- https://git.kernel.org/stable/c/b5be23f6ae610bdb262160a1f294afee6d0e6a69
- https://git.kernel.org/stable/c/cc4bc532acda66189bddc03b3fe1ad689d9a48a2
- https://git.kernel.org/stable/c/f006f596fe851c3b6aae60b79f89f89f0e515d2f
JSON original (NVD)
Mostrar
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"value": "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_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]."
}
],
"lastModified": "2026-08-04T10:19:08.113",
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