Answer in brief
CVE-2026-46294 records a High severity (CVSS 7.8) vulnerability in dm: fix a buffer overflow in ioctl processing. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2026-46294 records a High severity (CVSS 7.8) vulnerability in dm: fix a buffer overflow in ioctl processing. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8c5311237448f6ffeecc9aec2362e3692623668 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <526ff9126a0ae087b65726e1faf31114c718020d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d271631023cbe1cbe7c31a0275ab797883be6e0a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5af6a879e915ae7bcd83695c316ebb32e1c61bc2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8daa6c708ef524089ae43f2aed9190acb26d7df8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fa49cc884f6496a915c35621ba4da35649bf159 | c8c5311237448f6ffeecc9aec2362e3692623668, 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c, 526ff9126a0ae087b65726e1faf31114c718020d, f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a, d271631023cbe1cbe7c31a0275ab797883be6e0a, 5af6a879e915ae7bcd83695c316ebb32e1c61bc2, 8daa6c708ef524089ae43f2aed9190acb26d7df8, 2fa49cc884f6496a915c35621ba4da35649bf159 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Jun 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 7, 2026
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
Quoted source text, attributed separately from HOL analysis.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8c5311237448f6ffeecc9aec2362e3692623668 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <526ff9126a0ae087b65726e1faf31114c718020d || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d271631023cbe1cbe7c31a0275ab797883be6e0a || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5af6a879e915ae7bcd83695c316ebb32e1c61bc2 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8daa6c708ef524089ae43f2aed9190acb26d7df8 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fa49cc884f6496a915c35621ba4da35649bf159 | c8c5311237448f6ffeecc9aec2362e3692623668, 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c, 526ff9126a0ae087b65726e1faf31114c718020d, f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a, d271631023cbe1cbe7c31a0275ab797883be6e0a, 5af6a879e915ae7bcd83695c316ebb32e1c61bc2, 8daa6c708ef524089ae43f2aed9190acb26d7df8, 2fa49cc884f6496a915c35621ba4da35649bf159 |
| Linux/Linuxgeneric | 2.6.12 | Not reported |
Published upstream
Jun 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 7, 2026
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
Quoted source text, attributed separately from HOL analysis.