CVE-2019-3896

A double-free can happen in idr_remove_all() in lib/idr.c in the Linux kernel 2.6 branch. An unprivileged local attacker can use this flaw for a privilege escalation or for a system crash and a denial of service (DoS).

Weakness

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.

Affected Software

Potential Mitigations

References

• http://www.securityfocus.com/bid/108814
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3896
• https://security.netapp.com/advisory/ntap-20190710-0002/
• https://support.f5.com/csp/article/K04327111
• http://www.securityfocus.com/bid/108814
• https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3896
• https://security.netapp.com/advisory/ntap-20190710-0002/
• https://support.f5.com/csp/article/K04327111