CVE-2025-9900: Red Hat Enterprise Linux 10 · Write-what-where Condition
Affects Red Hat Enterprise Linux 10Source CVE Database V5
Not known to be exploited · CVSS 8.8 High.
Data as of 26 Oct 2026, 14:05 UTC
- EPSS
- 0.9% chance of exploitation in 30 days – higher than 61% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:HExploitation evidence
Disclosed: evidence found.
CVE published 23 Sep 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| Red Hat Red Hat Enterprise Linux 10 | Affected
| Fixed in– |
AI-suggested
Red Hat has released official security updates for compat-libtiff3 packages that address CVE-2025-9900. Users should apply the updates provided in advisories RHSA-2025:17651 and RHSA-2025:17675 for Red Hat Enterprise Linux 8 and related Extended Update Support and Extended Life Cycle versions. Detailed update instructions are available at https://access.redhat.com/articles/11258. Applying these updates mitigates the vulnerability. No additional mitigation steps are indicated by the vendor.
Description
A flaw was found in Libtiff. This vulnerability is a "write-what-where" condition, triggered when the library processes a specially crafted TIFF image file. By providing an abnormally large image height value in the file's metadata, an attacker can trick the library into writing attacker-controlled color data to an arbitrary memory location. This memory corruption can be exploited to cause a denial of service (application crash) or to achieve arbitrary code execution with the permissions of the user.
References
- access.redhat.com/errata/RHSA-2025:17651 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17675 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17710 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17738 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17739 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:17740 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:19113 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:19156 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:19276 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:19906 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:19947 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:20956 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:20998 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21060 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21061 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21062 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21407 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21506 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21507 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21508 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:21994 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:23078 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:23079 (opens in a new tab)
- access.redhat.com/errata/RHSA-2025:23080 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:0001 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:0076 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:0077 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:0078 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:3461 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:3462 (opens in a new tab)
- access.redhat.com/errata/RHSA-2026:7504 (opens in a new tab)
- access.redhat.com/security/cve/CVE-2025-9900 (opens in a new tab)
- bugzilla.redhat.com/show_bug.cgi?id=2392784 (opens in a new tab)
- github.com/SexyShoelessGodofWar/LibTiff-4.7.0-Write-What-Where?tab=readme-ov-file (opens in a new tab)
- gitlab.com/libtiff/libtiff/-/issues/704 (opens in a new tab)
- gitlab.com/libtiff/libtiff/-/merge_requests/732 (opens in a new tab)
- libtiff.gitlab.io/libtiff/releases/v4.7.1.html (opens in a new tab)
- lists.debian.org/debian-lts-announce/2025/09/msg00031.html (opens in a new tab)
- openwall.com/lists/oss-security/2025/09/26/3 (opens in a new tab)