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].
Affected versions
Linux kernel versions
2.6.22
and later are affected. Fixed in
4.14.308,
4.19.276,
5.4.235,
5.10.173,
5.15.100,
6.1.18,
6.2.5,
6.3
and their respective stable series.
References
The following references provide additional information about CVE-2023-53826 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/1cb14c06d6035539ef4215c4ba0871aea71d7c38
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PatchKernel patch commithttps://git.kernel.org/stable/c/3f9b63dfce44a7c3c095dd93d910408e07ab1845
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PatchKernel patch commithttps://git.kernel.org/stable/c/79548ccdd992707879b4b683b7251c58ddf26f12
Frequently asked questions
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What is CVE-2023-53826?
CVE-2023-53826 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.22 onward and has been patched in 4.14.308, 4.19.276, 5.4.235 and others. CVE-2023-53826 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2023-53826?
Yes — CVE-2023-53826 has been patched. Fixed versions include 4.14.308, 4.19.276, 5.4.235 and others. If you are running Linux kernel 2.6.22 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2023-53826 actively exploited?
No — CVE-2023-53826 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.