CVE-2026-46294
published 2026-06-08CVE-2026-46294: 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…
PriorityP344high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
EPSS
0.14%
4.0th percentile
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
Affected
51 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c8c5311237448f6ffeecc9aec2362e3692623668 | c8c5311237448f6ffeecc9aec2362e3692623668 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c | 448ee8fb79c26a26599ffa4b2adeb4322d3d3d8c |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 526ff9126a0ae087b65726e1faf31114c718020d | 526ff9126a0ae087b65726e1faf31114c718020d |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a | f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d271631023cbe1cbe7c31a0275ab797883be6e0a | d271631023cbe1cbe7c31a0275ab797883be6e0a |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 5af6a879e915ae7bcd83695c316ebb32e1c61bc2 | 5af6a879e915ae7bcd83695c316ebb32e1c61bc2 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8daa6c708ef524089ae43f2aed9190acb26d7df8 | 8daa6c708ef524089ae43f2aed9190acb26d7df8 |
| linux | linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 2fa49cc884f6496a915c35621ba4da35649bf159 | 2fa49cc884f6496a915c35621ba4da35649bf159 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 2.6.12.1 < 5.10.258 | 5.10.258 |
| linux | linux_kernel | >= 5.11 < 5.15.209 | 5.15.209 |
| linux | linux_kernel | >= 5.16 < 6.1.175 | 6.1.175 |
| linux | linux_kernel | >= 6.13 < 6.18.30 | 6.18.30 |
| linux | linux_kernel | >= 6.19 < 7.0.7 | 7.0.7 |
| linux | linux_kernel | >= 6.2 < 6.6.140 | 6.6.140 |
| linux | linux_kernel | >= 6.7 < 6.12.88 | 6.12.88 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vendor_ubuntu7.1HIGH
vendor_redhat7.0MEDIUM
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It was discovered that some AMD Zen 2 processors did not properly isolate
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It was discovered that some AMD Zen 5 processors supporting RDSEED
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construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
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situations, leading to an out-of-bounds read. An attacker could use this to
construct a malicious NTFS image that, when mounted and operated on, could
expose sensitive information (kernel memory). (CVE-2023-45896)
It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
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Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
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- PSP security protocol;
- ARM64 architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
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the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
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It was discovered that some AMD processors did not properly clear data in
the floating point divider unit during speculative execution. A local
attacker could use this to expose sensitive information. (CVE-2025-54505)
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
It was discovered that some AMD Zen 5 processors supporting RDSEED
instruction did not properly handle entropy, potentially resulting in the
consumption of insufficiently random values. A local attacke
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Summary: Several security issues were fixed in the Linux kernel.
It was discovered that some AMD Zen 2 processors did not properly isolate
shared resources in the operation cache. A local attacker could possibly
use this issue to corrupt instructions executed at a higher privilege
level, resulting in privilege escalation. (CVE-2025-54518)
Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- PSP security protocol;
- ARM64 architecture;
- PowerPC architecture;
- RISC-V architecture;
- S390 architecture;
- User-Mode Linux (UML);
- x86 architecture;
- Block layer subsystem;
- Cryptographic API;
- Intel NPU Driver;
- DRBD Distrib
Red Hat
kernel: dm: fix a buffer overflow in ioctl processing
vendor_redhat·2026-06-08·CVSS 7.0
CVE-2026-46294 [MEDIUM] CWE-190 kernel: dm: fix a buffer overflow in ioctl processing
kernel: dm: fix a buffer overflow in ioctl processing
A flaw was found in the Linux kernel, specifically within the `dm-ioctl` module. An improper pointer alignment in the `retrieve_status` function could lead to a buffer overflow, where data is written beyond the allocated buffer. Despite this, the vulnerability has no practical security implications as it requires root privileges to trigger, and standard library usage prevents accidental exploitation.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Out of support scope
Package: kernel (Red Hat Enterprise Linux 7) - Affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Affected
Package: kernel (Red Hat Enterprise Linux 8) - Affected
Package: kernel-rt (Red Hat Enterprise
GHSA
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 retr
ghsa_unreviewed·2026-06-08
CVE-2026-46294 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 retr
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 dat
VulDB
Linux Kernel up to 7.0.6 dm Remaining buffer overflow
vuldb·2026-06-08
CVE-2026-46294 [CRITICAL] Linux Kernel up to 7.0.6 dm Remaining buffer overflow
A vulnerability described as critical has been identified in Linux Kernel up to 7.0.6. Affected by this vulnerability is an unknown functionality of the component dm. Such manipulation of the argument Remaining leads to buffer overflow.
This vulnerability is listed as CVE-2026-46294. The attack must be carried out from within the local network. There is no available exploit.
Upgrading the affected component is recommended.
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/2fa49cc884f6496a915c35621ba4da35649bf159https://git.kernel.org/stable/c/448ee8fb79c26a26599ffa4b2adeb4322d3d3d8chttps://git.kernel.org/stable/c/526ff9126a0ae087b65726e1faf31114c718020dhttps://git.kernel.org/stable/c/5af6a879e915ae7bcd83695c316ebb32e1c61bc2https://git.kernel.org/stable/c/8daa6c708ef524089ae43f2aed9190acb26d7df8https://git.kernel.org/stable/c/c8c5311237448f6ffeecc9aec2362e3692623668https://git.kernel.org/stable/c/d271631023cbe1cbe7c31a0275ab797883be6e0ahttps://git.kernel.org/stable/c/f0b0b09d9840838ae77ccdd6a62de0daef4e6e0a
2026-06-08
Published