s390/monwriter: Reject buffer reuse with different data length
Published Aug 15, 2026
5.5
MEDIUMCVSS 3.1
EPSS 0.22%
Description
When data buffers are reused, e.g. for interval sample records, the first record determines the data length, and the size of the buffer for user copy. Current monwriter code does not check if the data length was changed for subsequent records, which also would never happen for valid user programs.
However, a malicious user could change the data length, resulting in out of bounds user copy to the kernel buffer, and memory corruption. By default, the monwriter misc device is created with root-only permissions, so practical impact is typically low.
Fix this by checking for changed data length and rejecting such records.
Affected products
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- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version StatusaffectedConstraints
- Version
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- Version 2.6.19StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<2.6.19
- Version 5.10.261StatusunaffectedConstraints<=5.10.*
- Version 5.15.212StatusunaffectedConstraints<=5.15.*
- Version 6.1.178StatusunaffectedConstraints<=6.1.*
- Version 6.12.97StatusunaffectedConstraints<=6.12.*
- Version 6.18.40StatusunaffectedConstraints<=6.18.*
- Version 6.6.145StatusunaffectedConstraints<=6.6.*
- Version 7.1.5StatusunaffectedConstraints<=7.1.*
- Version 7.2StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux | unaffected |
| |||||||||||||||||||||||||||||||||
| Linux | Linux | affected |
|
No data.
No data.
Red Hat Enterprise Linux 10
kernel
Fix deferred
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 8
kernel
Not affected
Red Hat Enterprise Linux 8
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel
Fix deferred
Red Hat Enterprise Linux 9
kernel-rt
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 10 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Aug–Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.22% (0.00220) | 11.27th | v5 (v2026.06.15) |
| Aug 15, 2026 | 0.21% (0.00210) | 11.54th | v5 (v2026.06.15) |
References (13)
- https://access.redhat.com/security/cve/CVE-2026-72025 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2516232 Issue Tracking
- https://git.kernel.org/stable/c/01f3ce411711c2c919598ea25320a5a48f71edbc
- https://git.kernel.org/stable/c/036bc5661060702e798d215e81bb46da530965b3
- https://git.kernel.org/stable/c/096dff1247037d329c04b3a5be0ecdfb1c5c7ac6
- https://git.kernel.org/stable/c/2995ccec260caa9e85b3301a4aba1e66ed80ad74
- https://git.kernel.org/stable/c/759d91378203ea35fa9bca6726dcf0010de081fb
- https://git.kernel.org/stable/c/ae5347f3db1782c6118f6cc0d9fd8b1d43397db3
- https://git.kernel.org/stable/c/d39cf4a6d721b1ae21eb53bbf3e8cd984253d7ab
- https://git.kernel.org/stable/c/f0745496f7c171271cafd9457df3b914a483ddeb
- https://lore.kernel.org/linux-cve-announce/2026081510-CVE-2026-72025-3a2a@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2026-72025
- https://www.cve.org/CVERecord?id=CVE-2026-72025
Change history (0)
No recorded changes yet.