CVE-2025-38556: HID: core: Harden s32ton() against conversion to 0 bits
Noroxi assessment
Priority: Monitor (action score 28/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.18% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 3c86548a20d7bc2861aa4de044991a327bebad1a, 6cdf6c708717c5c6897d0800a1793e83757c7491, 810189546cb6c8f36443ed091d91f1f5d2fc2ec7; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.
Low priority for now. Upgrade to Linux Linux 3c86548a20d7bc2861aa4de044991a327bebad1a, 6cdf6c708717c5c6897d0800a1793e83757c7491, 810189546cb6c8f36443ed091d91f1f5d2fc2ec7; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
In the Linux kernel, the following vulnerability has been resolved: HID: core: Harden s32ton() against conversion to 0 bits Testing by the syzbot fuzzer showed that the HID core gets a shift-out-of-bounds exception when it tries to convert a 32-bit quantity to a 0-bit quantity. Ideally this should never occur, but there are buggy devices and some might have a report field with size set to zero; we shouldn't reject the report or the device just because of that. Instead, harden the s32ton() routine so that it returns a reasonable result instead of crashing when it is called with the number of bits set to 0 -- the same as what snto32() does.
- BDU:2025-10722
- ALSA-2025:16372
- ALSA-2025:17760
- ALSA-2025:17776
- DLA-4436-1
- DLA-4475-1
- DSA-6008-1
- RHSA-2025:16372
- RHSA-2025:17760
- RHSA-2025:17776
- RHSA-2025:18932
- RHSA-2025:19104
- RHSA-2025:19222
- RHSA-2025:19223
- RHSA-2025:19224
- RHSA-2025:19268
- RHSA-2025:19492
- RHSA-2025:21063
- RHSA-2025:21082
- RHSA-2025:21667
- Published
- Aug 19, 2025
- Updated
- Jun 17, 2026
- EPSS
- 0.1% · 7th percentile
- CWE
- CWE-125
Report tools
Action score
28
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.20affected
- dde5845a529ff753364a6d1aea61180946270bfa and later · before 6cdf6c708717c5c6897d0800a1793e83757c7491affected · git
- dde5845a529ff753364a6d1aea61180946270bfa and later · before eeeaba737919bdce9885e2a00ac2912f61a3684daffected · git
- dde5845a529ff753364a6d1aea61180946270bfa and later · before 3c86548a20d7bc2861aa4de044991a327bebad1aaffected · git
- dde5845a529ff753364a6d1aea61180946270bfa and later · before 810189546cb6c8f36443ed091d91f1f5d2fc2ec7affected · git
- dde5845a529ff753364a6d1aea61180946270bfa and later · before d3b504146c111548ab60b6ef7aad00bfb1db05a2affected · git
- dde5845a529ff753364a6d1aea61180946270bfa and later · before 8b4a94b1510f6a46ec48494b52ee8f67eb4fc836affected · git
- dde5845a529ff753364a6d1aea61180946270bfa and later · before 865ad8469fa24de1559f247d9426ab01e5ce3a56affected · git
- dde5845a529ff753364a6d1aea61180946270bfa and later · before a6b87bfc2ab5bccb7ad953693c85d9062aef3fddaffected · git
- before 2.6.20not affected · semver
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel2.6.20 and later · before 6.12.46
- linux linux kernel6.13 and later · before 6.15.10
- linux linux kernel6.16 and later · before 6.16.1
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:10 | kernel-abi-stablelists | before 6.12.0-55.39.1.el10_0 | 6.12.0-55.39.1.el10_0 |
| AlmaLinux:10 | kernel-doc | before 6.12.0-55.39.1.el10_0 | 6.12.0-55.39.1.el10_0 |
| AlmaLinux:8 | bpftool | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-abi-stablelists | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-core | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-cross-headers | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-debug | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-debug-core | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-debug-devel | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-debug-modules-extra | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-devel | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-doc | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-headers | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-modules | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-modules-extra | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-tools | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-tools-libs | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-tools-libs-devel | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-zfcpdump | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-zfcpdump-core | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-zfcpdump-devel | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
| AlmaLinux:8 | kernel-zfcpdump-modules | before 4.18.0-553.76.1.el8_10 | 4.18.0-553.76.1.el8_10 |
+96
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2025-38554Aug 19, 2025 · mm: fix a UAF when vma->mm is freed after vma->vm_refcnt got dropped31Monitor
- ← EarlierCVE-2025-38555Aug 19, 2025 · usb: gadget : fix use-after-free in composite_dev_cleanup()31Monitor
- Later →CVE-2025-38558Aug 19, 2025 · usb: gadget: uvc: Initialize frame-based format color matching descriptor22Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 3c86548a20d7bc2861aa4de044991a327bebad1a | Vendor (CNA) |
| Linux Linux | 6cdf6c708717c5c6897d0800a1793e83757c7491 | Vendor (CNA) |
| Linux Linux | 810189546cb6c8f36443ed091d91f1f5d2fc2ec7 | Vendor (CNA) |
| Linux Linux | 865ad8469fa24de1559f247d9426ab01e5ce3a56 | Vendor (CNA) |
| Linux Linux | 8b4a94b1510f6a46ec48494b52ee8f67eb4fc836 | Vendor (CNA) |
| Linux Linux | a6b87bfc2ab5bccb7ad953693c85d9062aef3fdd | Vendor (CNA) |
| Linux Linux | d3b504146c111548ab60b6ef7aad00bfb1db05a2 | Vendor (CNA) |
| Linux Linux | eeeaba737919bdce9885e2a00ac2912f61a3684d | Vendor (CNA) |
| cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 | Release Notes | Microsoft (MSRC) |
| almalinux:bpftool | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-abi-stablelists | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-core | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-cross-headers | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-core | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-devel | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-debug-modules-extra | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-devel | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| almalinux:kernel-doc | 4.18.0-553.76.1.el8_10 · AlmaLinux:8 | Package registry (OSV) |
| debian:linux | 6.1.159-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.1 | 6.1.159-1~deb11u1 · Debian:11 | Package registry (OSV) |
| red hat:bpftool | 0:4.18.0-553.76.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:bpftool-debuginfo | 0:4.18.0-553.76.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel | 0:4.18.0-553.76.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-abi-stablelists | 0:4.18.0-553.76.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-core | 0:4.18.0-553.76.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug | 0:4.18.0-553.76.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
| red hat:kernel-debug-core | 0:4.18.0-553.76.1.el8_10 · Red Hat:enterprise_linux:8::baseos | Package registry (OSV) |
+6
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log (1)
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (7 more)Show less
- git.kernel.org/stable/c/6cdf6c708717c5c6897d0800a1793e83757c7491
- git.kernel.org/stable/c/810189546cb6c8f36443ed091d91f1f5d2fc2ec7
- git.kernel.org/stable/c/865ad8469fa24de1559f247d9426ab01e5ce3a56
- git.kernel.org/stable/c/8b4a94b1510f6a46ec48494b52ee8f67eb4fc836
- git.kernel.org/stable/c/a6b87bfc2ab5bccb7ad953693c85d9062aef3fdd
- git.kernel.org/stable/c/d3b504146c111548ab60b6ef7aad00bfb1db05a2
- git.kernel.org/stable/c/eeeaba737919bdce9885e2a00ac2912f61a3684d
Vendor advisories and official records. Exploit/PoC links are deliberately left out.