CVE-2026-35233
CVE-2026-35233 is a medium-severity vulnerability in Oracle Linux with a CVSS 3.x base score of 4.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-125.
Key facts
- Severity: Medium (CVSS 3.x base score 4.4)
- EPSS exploit prediction: 0% (1st percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-26702
- Weakness: CWE-125
- Affected product: Oracle Linux
- Published:
- Last modified:
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.
Frequently asked questions
- What is CVE-2026-35233?
- 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.
- How severe is CVE-2026-35233?
- CVE-2026-35233 has a CVSS 3.x base score of 4.4, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity low, and availability low.
- Is CVE-2026-35233 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-35233?
- CVE-2026-35233 primarily affects Oracle Linux. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
- How do I fix CVE-2026-35233?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-35233 have an EU (EUVD) identifier?
- Yes. CVE-2026-35233 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-26702.
- When was CVE-2026-35233 published?
- CVE-2026-35233 was published on 2026-05-01 and last updated on 2026-06-17.
References
Affected products (3)
- cpe:2.3:o:oracle:linux:8:-:*:*:*:*:*:*
- cpe:2.3:o:oracle:linux:9:0:*:*:*:*:*:*
- cpe:2.3:o:oracle:linux:10:0:*:*:*:*:*:*
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