CVE-2023-53481

ubi: ubi_wl_put_peb: Fix infinite loop when wear-leveling work failed

MEDIUM

5.5

CVSS Score

Published: October 1, 2025 at 11:42 AM UTC

Updated: October 15, 2026 at 10:17 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.2%

SSVC

No known exploit

Description

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(): 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_0 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].

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

2.6.25 ≤ v < 4.14.3084.15 ≤ v < 4.19.2764.20 ≤ v < 5.4.2355.11 ≤ v < 5.15.1005.16 ≤ v < 6.1.185.5 ≤ v < 5.10.1736.2 ≤ v < 6.2.52.6.2543f9b25a9cdd7b177f77f026b1461abd1abbd174

Vendor states this is fixed in 3afaaf6f5867dc4ad383808d4053f428ec7b867d (fixed)

Vendor states this is fixed in 4d57a7333e26040f2b583983e1970d9d460e56b0 (fixed)

Vendor states this is fixed in 5af1c643184a5d09ff5b3f334077a4d0a163c677 (fixed)

Vendor states this is fixed in 8a18856e074479bd050b01e688c58defadce7ab0 (fixed)

Vendor states this is fixed in b40d2fbf47af58377e898b5062077a47bb28a132 (fixed)

Vendor states this is fixed in b5be23f6ae610bdb262160a1f294afee6d0e6a69 (fixed)

Vendor states this is fixed in cc4bc532acda66189bddc03b3fe1ad689d9a48a2 (fixed)

Vendor states this is fixed in f006f596fe851c3b6aae60b79f89f89f0e515d2f (fixed)

Vendor states this is fixed in 2.6.25 (unaffected)

Vendor states this is fixed in 4.14.308 (unaffected)

Vendor states this is fixed in 4.19.276 (unaffected)

Vendor states this is fixed in 5.10.173 (unaffected)