CVE-2023-53826

Description

In the Linux kernel, the following vulnerability has been resolved: ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show() Wear-leveling entry could be freed in error path, which may be accessed again in eraseblk_count_seq_show(), for example: __erase_worker eraseblk_count_seq_show wl = ubi->lookuptbl[*block_number] if (wl) wl_entry_destroy ubi->lookuptbl[e->pnum] = NULL kmem_cache_free(ubi_wl_entry_slab, e) erase_count = wl->ec // UAF! Wear-leveling entry updating/accessing in ubi->lookuptbl should be protected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize wl entry accessing between wl_entry_destroy() and eraseblk_count_seq_show(). Fetch a reproducer in [Link].

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References

Other 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 https://git.kernel.org/stable/c/9d448dd6bcb61a508204b57ea1f454ba9bac2f24 https://git.kernel.org/stable/c/a100de2974d208cfca032179b02ed4d1a0a7f143 https://git.kernel.org/stable/c/a240bc5c43130c6aa50831d7caaa02a1d84e1bce

Frequently Asked Questions

What is CVE-2023-53826? +

In the Linux kernel, the following vulnerability has been resolved: ubi: Fix UAF wear-leveling entry in eraseblk_count_seq_show() Wear-leveling entry could be freed in error path, which may be accessed again in eraseblk_count_seq_show(), for example: __erase_worker eraseblk_count_seq_show wl = ubi->lookuptbl[*block_number] if (wl) wl_entry_destroy ubi->lookuptbl[e->pnum] = NULL kmem_cache_free(ubi_wl_entry_slab, e) erase_count = wl->ec // UAF! Wear-leveling entry updating/accessing in ubi->lookuptbl should be protected by ubi->wl_lock, fix it by adding ubi->wl_lock to serialize wl entry accessing between wl_entry_destroy() and eraseblk_count_seq_show(). Fetch a reproducer in [Link].

How do I check if I'm vulnerable to CVE-2023-53826? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2023-53826

Description

References

Other References

Frequently Asked Questions

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