CVE-2021-3744

A memory leak flaw was found in the Linux kernel in the ccp_run_aes_gcm_cmd() function in drivers/crypto/ccp/ccp-ops.c, which allows attackers to cause a denial of service (memory consumption). This vulnerability is similar with the older CVE-2019-18808.

Weakness

The product does not sufficiently track and release allocated memory after it has been used, making the memory unavailable for reallocation and reuse.

Affected Software

Potential Mitigations

• Choose a language or tool that provides automatic memory management, or makes manual memory management less error-prone.
• For example, glibc in Linux provides protection against free of invalid pointers.
• When using Xcode to target OS X or iOS, enable automatic reference counting (ARC) [REF-391].
• To help correctly and consistently manage memory when programming in C++, consider using a smart pointer class such as std::auto_ptr (defined by ISO/IEC ISO/IEC 14882:2003), std::shared_ptr and std::unique_ptr (specified by an upcoming revision of the C++ standard, informally referred to as C++ 1x), or equivalent solutions such as Boost.

References

• http://www.openwall.com/lists/oss-security/2021/09/14/1
• https://bugzilla.redhat.com/show_bug.cgi?id=2000627
• https://github.com/torvalds/linux/commit/505d9dcb0f7ddf9d075e729523a33d38642ae680
• https://kernel.googlesource.com/pub/scm/linux/kernel/git/herbert/crypto-2.6/+/505d9dcb0f7ddf9d075e729523a33d38642ae680%5E%21/#F0
• https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7BLLVKYAIETEORUPTFO3TR3C33ZPFXQM/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAT3RERO6QBKSPJBNNRWY3D4NCGTFOS7/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYKURLXBB2555ASWMPDNMBUPD6AG2JKQ/
• https://seclists.org/oss-sec/2021/q3/164
• https://www.debian.org/security/2022/dsa-5096
• https://www.oracle.com/security-alerts/cpujul2022.html
• http://www.openwall.com/lists/oss-security/2021/09/14/1
• https://bugzilla.redhat.com/show_bug.cgi?id=2000627
• https://github.com/torvalds/linux/commit/505d9dcb0f7ddf9d075e729523a33d38642ae680
• https://kernel.googlesource.com/pub/scm/linux/kernel/git/herbert/crypto-2.6/+/505d9dcb0f7ddf9d075e729523a33d38642ae680%5E%21/#F0
• https://lists.debian.org/debian-lts-announce/2022/03/msg00012.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/7BLLVKYAIETEORUPTFO3TR3C33ZPFXQM/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LAT3RERO6QBKSPJBNNRWY3D4NCGTFOS7/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/SYKURLXBB2555ASWMPDNMBUPD6AG2JKQ/
• https://seclists.org/oss-sec/2021/q3/164
• https://www.debian.org/security/2022/dsa-5096
• https://www.oracle.com/security-alerts/cpujul2022.html