SARA / Free Tools / CVE / CVE-2023-45898

CVE-2023-45898 — The Linux kernel before 6

The Linux kernel before 6.5.4 has an es1 use-after-free in fs/ext4/extents_status.c, related to ext4_es_insert_extent.

CVSS

7.8 HIGH

EPSS

0.27% (top 81.50%)

CWE

—

Published

2023-10-16T03:15:09.320

Last modified

2026-10-15T01:17:10.143

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

01What is this vulnerability?

The Linux kernel before 6.5.4 has an es1 use-after-free in fs/ext4/extents_status.c, related to ext4_es_insert_extent.

No structured affected-product list available — see references below for vendor advisories.

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

Patch to a fixed version listed in the vendor advisory (see references below).
Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
Hunt historical logs for exploitation indicators — see Detection signatures below.

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.4
github.com — https://github.com/torvalds/linux/commit/768d612f79822d30a1e7d132a4d4b05337ce42e…
lkml.org — https://lkml.org/lkml/2023/8/13/477
lore.kernel.org — https://lore.kernel.org/lkml/aa03f191-445c-0d2e-d6d7-0a3208d7df7a%40huawei.com/T…
www.spinics.net — https://www.spinics.net/lists/stable-commits/msg317086.html
cdn.kernel.org — https://cdn.kernel.org/pub/linux/kernel/v6.x/ChangeLog-6.5.4
github.com — https://github.com/torvalds/linux/commit/768d612f79822d30a1e7d132a4d4b05337ce42e…
lkml.org — https://lkml.org/lkml/2023/8/13/477
lore.kernel.org — https://lore.kernel.org/lkml/aa03f191-445c-0d2e-d6d7-0a3208d7df7a%40huawei.com/T…
www.spinics.net — https://www.spinics.net/lists/stable-commits/msg317086.html

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