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    CVE-2015-6564

    Use-after-free vulnerability in the mm_answer_pam_free_ctx function in monitor.c in sshd in OpenSSH before 7.0 on non-OpenBSD platforms might allow local users to gain privileges by leveraging control of the sshd uid to send an unexpectedly early MONITOR_REQ_PAM_FREE_CTX request.

    Published:Aug 11, 2015
    Last Modified:May 27, 2026
    EPS:Aug 24, 2015
    EPSS Score:0.02063
    CVSS Score:7

    Affected Products

    Vendor
    Openbsd
    Product
    Openssh
    Vendor
    Redhat
    Product
    Enterprise Linux

    Exploits

    No exploit reference

    Common Weakness Enumeration

    CWE-416 Use After Free

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

    Related CVEs

    CVE-2026-73283 (CVSS 2.5) — In sshd in OpenSSH before 10.5, the restrict keyword (in authorized_keys) was supposed to be applicable to tun…
    CVE-2026-73282 (CVSS 4.8) — In ssh in OpenSSH before 10.5, a use-after-free for realloc data can occur if a certain pair of remote-forward…
    CVE-2026-73281 (CVSS 3.5) — In ssh-agent in OpenSSH before 10.5, some operations can occur remotely but were intended to occur only locall…
    CVE-2026-60002 (CVSS 7.7) — ssh in OpenSSH before 10.4 can have a use-after-free when a server changes its host key during a key re-exchan…
    CVE-2026-60001 (CVSS 6.5) — sshd in OpenSSH before 10.4 does not always honor the minimum authentication delay.…
    CVE-2026-60000 (CVSS 3.7) — sshd in OpenSSH before 10.4 allows remote attackers to cause a denial of service (resource consumption from ex…
    CVE-2026-59999 (CVSS 5.9) — In sshd in OpenSSH before 10.4, DisableForwarding=yes was supposed to take precedence over PermitTunnel=yes, b…
    CVE-2026-59998 (CVSS 4.8) — sshd in OpenSSH before 10.4 has an undocumented security-relevant behavior: GSSAPIStrictAcceptorCheck has no v…
    CVE-2026-59997 (CVSS 4.2) — internal-sftp in sshd in OpenSSH before 10.4 recognizes only the first 9 command-line arguments, which can be …
    CVE-2026-59996 (CVSS 4.2) — scp in OpenSSH before 10.4 may place a file in the parent directory of an intended directory when the copy occ…

    References

    http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
    http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
    http://rhn.redhat.com/errata/RHSA-2016-0741.html
    http://seclists.org/fulldisclosure/2015/Aug/54
    http://www.openssh.com/txt/release-7.0
    http://www.openwall.com/lists/oss-security/2015/08/22/1
    http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
    http://www.securityfocus.com/bid/76317
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://github.com/openssh/openssh-portable/commit/5e75f5198769056089fb06c4d738ab0e5abc66f7
    https://kc.mcafee.com/corporate/index?page=content&id=SB10136
    https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
    https://security.gentoo.org/glsa/201512-04
    https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-764
    http://lists.fedoraproject.org/pipermail/package-announce/2015-August/165170.html
    http://lists.opensuse.org/opensuse-security-announce/2015-09/msg00017.html
    http://rhn.redhat.com/errata/RHSA-2016-0741.html
    http://seclists.org/fulldisclosure/2015/Aug/54
    http://www.openssh.com/txt/release-7.0
    http://www.openwall.com/lists/oss-security/2015/08/22/1
    http://www.oracle.com/technetwork/topics/security/bulletinjan2016-2867206.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
    http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
    http://www.securityfocus.com/bid/76317
    https://cert-portal.siemens.com/productcert/pdf/ssa-412672.pdf
    https://github.com/openssh/openssh-portable/commit/5e75f5198769056089fb06c4d738ab0e5abc66f7
    https://kc.mcafee.com/corporate/index?page=content&id=SB10136
    https://lists.debian.org/debian-lts-announce/2018/09/msg00010.html
    https://security.gentoo.org/glsa/201512-04
    https://www.broadcom.com/support/fibre-channel-networking/security-advisories/brocade-security-advisory-2019-764

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High