dm: fix a buffer overflow in ioctl processing
In the Linux kernel, the following vulnerability has been resolved: dm: fix a buffer overflow in ioctl processing Tony Asleson (using Claude) found a buffer overflow in dm-ioctl in the function retrieve_status: 1. The code in retrieve_status checks that the output string fits into the output buffer and writes the output string there 2. Then, the code aligns the "outptr" variable to the next 8-byte boundary: outptr = align_ptr(outptr); 3. The alignment doesn't check overflow, so outptr could point past the buffer end 4. The "for" loop is iterated again, it executes: remaining = len - (outptr - outbuf); 5. If "outptr" points past "outbuf + len", the arithmetics wraps around and the variable "remaining" contains unusually high number 6. With "remaining" being high, the code writes more data past the end of the buffer Luckily, this bug has no security implications because: 1. Only root can issue device mapper ioctls 2. The commonly used libraries that communicate with device mapper (libdevmapper and devicemapper-rs) use buffer size that is aligned to 8 bytes - thus, "outptr = align_ptr(outptr)" can't overshoot the input buffer and the bug can't happen accidentally
- Published
- Jun 8, 2026
- Updated
- Jul 23, 2026
- EPSS
- 0.2% · 8th percentile
- CWE
- CWE-787
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel2.6.12.1 and later · before 5.10.258
- linux linux kernel5.11 and later · before 5.15.209
- linux linux kernel5.16 and later · before 6.1.175
- linux linux kernel6.2 and later · before 6.6.140
- linux linux kernel6.7 and later · before 6.12.88
- linux linux kernel6.13 and later · before 6.18.30
- linux linux kernel6.19 and later · before 7.0.7
- linux linux kernel2.6.12
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
- 2.6.12affected
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before c8c5311237448f6ffeecc9aec2362e3692623668affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8caffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 526ff9126a0ae087b65726e1faf31114c718020daffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before f0b0b09d9840838ae77ccdd6a62de0daef4e6e0aaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before d271631023cbe1cbe7c31a0275ab797883be6e0aaffected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 5af6a879e915ae7bcd83695c316ebb32e1c61bc2affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 8daa6c708ef524089ae43f2aed9190acb26d7df8affected · git
- 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and later · before 2fa49cc884f6496a915c35621ba4da35649bf159affected · git
- before 2.6.12not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.176-1 | 6.1.176-1 |
| Debian:13 | linux | before 6.12.88-1 | 6.12.88-1 |
| Debian:14 | linux | before 7.0.7-1 | 7.0.7-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- 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
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 2fa49cc884f6496a915c35621ba4da35649bf159 | Vendor (CNA) |
| Linux Linux | 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c | Vendor (CNA) |
| Linux Linux | 526ff9126a0ae087b65726e1faf31114c718020d | Vendor (CNA) |
| Linux Linux | 5af6a879e915ae7bcd83695c316ebb32e1c61bc2 | Vendor (CNA) |
| Linux Linux | 8daa6c708ef524089ae43f2aed9190acb26d7df8 | Vendor (CNA) |
| Linux Linux | c8c5311237448f6ffeecc9aec2362e3692623668 | Vendor (CNA) |
| Linux Linux | d271631023cbe1cbe7c31a0275ab797883be6e0a | Vendor (CNA) |
| Linux Linux | f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a | Vendor (CNA) |
| debian:linux | 6.1.176-1 · Debian:12 | Package registry (OSV) |
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.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
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
- high · data or configuration can be modified
- 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
- High
- Availability impact
- High
Weakness class (CWE)
CWE-787 · Out-of-bounds WriteCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159
- git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c
- git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020d
- git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2
- git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8
- git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668
- git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0a
- git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a
Vendor advisories and official records. Exploit/PoC links are deliberately left out.