# CVE-2026-35233: dtrace: An unprivileged attacker can craft a user-space process with a malicious ELF binary containing an out-of-range sh_lin...

CVE-2026-35233 is fixed in 3 products on 1 platform, first by ELSA-2026-50249, released April 30, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-35233
- Priority: Routine
- CVSS: 4.4 (medium)
- EPSS: 0.0011
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 30, 2026

## Description

An unprivileged attacker can craft a user-space process with a malicious ELF binary containing an out-of-range sh_link field. When root-level dtrace attaches to -- or instruments -- that process (via dtrace -p , pid probes, or USDT), the ELF parser reads heap memory beyond the allocated section cache array without any bounds check. This results in an uninitialized/out-of-bounds heap read that can cause a NULL pointer dereference crash of the dtrace process (DoS), or -- depending on heap layout -- a read-then-use of a garbage pointer controlled by adjacent allocations, providing a foothold toward further exploitation in a privileged context.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | dtrace Debian 14 | 2.0.7-1 | [DEBIAN-CVE-2026-35233](https://patchblox.com/security/data/fix/linux/debian-cve-2026-35233.md) | May 1, 2026 |
| Linux | dtrace ol 10 | 0:2.0.7-4.el9 | [ELSA-2026-50249](https://patchblox.com/security/data/fix/linux/elsa-2026-50249.md) | Apr 30, 2026 |
| Linux | dtrace ol 8 | 0:2.0.7-4.el9 | [ELSA-2026-50250](https://patchblox.com/security/data/fix/linux/elsa-2026-50250.md) | Apr 30, 2026 |
| Linux | dtrace ol 9 | 0:2.0.7-4.el9 | [ELSA-2026-50249](https://patchblox.com/security/data/fix/linux/elsa-2026-50249.md) | Apr 30, 2026 |
| Linux | dtrace-devel ol 10 | 0:2.0.7-4.el9 | [ELSA-2026-50249](https://patchblox.com/security/data/fix/linux/elsa-2026-50249.md) | Apr 30, 2026 |
| Linux | dtrace-devel ol 8 | 0:2.0.7-4.el9 | [ELSA-2026-50250](https://patchblox.com/security/data/fix/linux/elsa-2026-50250.md) | Apr 30, 2026 |
| Linux | dtrace-devel ol 9 | 0:2.0.7-4.el9 | [ELSA-2026-50249](https://patchblox.com/security/data/fix/linux/elsa-2026-50249.md) | Apr 30, 2026 |
| Linux | dtrace-testsuite ol 10 | 0:2.0.7-4.el9 | [ELSA-2026-50249](https://patchblox.com/security/data/fix/linux/elsa-2026-50249.md) | Apr 30, 2026 |
| Linux | dtrace-testsuite ol 8 | 0:2.0.7-4.el9 | [ELSA-2026-50250](https://patchblox.com/security/data/fix/linux/elsa-2026-50250.md) | Apr 30, 2026 |
| Linux | dtrace-testsuite ol 9 | 0:2.0.7-4.el9 | [ELSA-2026-50249](https://patchblox.com/security/data/fix/linux/elsa-2026-50249.md) | Apr 30, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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