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CVE-2023-53481

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

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 4.14.308, 4.19.276, 5.4.235, 5.10.173, 5.15.100, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: total

Summary

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].

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in b40d2fbf47af58377e898b5062077a47bb28a132; From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in f006f596fe851c3b6aae60b79f89f89f0e515d2f; From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in b5be23f6ae610bdb262160a1f294afee6d0e6a69; From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in 8a18856e074479bd050b01e688c58defadce7ab0; From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in 3afaaf6f5867dc4ad383808d4053f428ec7b867d; From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in cc4bc532acda66189bddc03b3fe1ad689d9a48a2; From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in 5af1c643184a5d09ff5b3f334077a4d0a163c677; From 43f9b25a9cdd7b177f77f026b1461abd1abbd174 · fixed in 4d57a7333e26040f2b583983e1970d9d460e56b0

  • Linux Linux

    2.6.25

  • KernelLinux

    From 2.6.25 · fixed in 4.14.308; From 4.15.0 · fixed in 4.19.276; From 4.20.0 · fixed in 5.4.235; From 5.5.0 · fixed in 5.10.173; From 5.11.0 · fixed in 5.15.100; From 5.16.0 · fixed in 6.1.18; From 6.2.0 · fixed in 6.2.5

References 8

git.kernel.org