CVE-2026-102010 Red Hat CVE debrief

Who should care

Defenders responsible for systems using affected GCC versions, particularly in environments where untrusted input is processed, should assess exposure and verify potential impact. This includes operators, platform administrators, vulnerability management teams, and security teams who need to ensure that their systems are updated or mitigated against this vulnerability.

Why it matters

Defenders should prioritize assessing exposure and verifying potential impact on systems using affected GCC versions, particularly in environments where untrusted input is processed.

• Potential Denial of Service (DoS) via application crash
• Potential memory corruption issues
• Need to verify affected versions and configurations
• Requires patching or updates to mitigate the vulnerability

Technical summary

The erase_if function in libstdc++'s binary heap priority queue reallocates storage but fails to update its internal entry pointer, leading to a use-after-free condition. This can be exploited to cause a Denial of Service (DoS) via an application crash or potential memory corruption. The vulnerability arises from the library's failure to update its internal entry pointer after reallocating storage, leading to a use-after-free condition. This issue can have significant impacts on systems using affected GCC versions, particularly in environments where untrusted input is processed.

Defensive priority

Defenders should prioritize assessing exposure and verifying potential impact on systems using affected GCC versions, particularly in environments where untrusted input is processed.

Recommended defensive actions

• Assess exposure of systems using affected GCC versions
• Verify potential impact on applications processing untrusted input
• Apply patches or updates provided by vendors
• Monitor for potential DoS or memory corruption issues
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record and NVD entry provide details on the vulnerability. Red Hat has released advisories RHSA-2026:73642 and RHSA-2026:74569 regarding this issue. The vulnerability was introduced due to a code change in the libstdc++ library, which handles binary heap priority queues. The erase_if function in this library reallocates storage but fails to update its internal entry pointer, leading to a use-after-free condition. This condition can be exploited to cause a Denial of Service (DoS) via an application crash or potential memory.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.