Glibc
Monthly
Buffer overflow in glibc's obsolete NIS authentication function allows remote attackers to compromise integrity and availability via spoofed UDP responses. Affects all glibc versions through 2.43, but exploitation requires the target application to actively use the deprecated nis_local_principal function (obsolete since glibc 2.26). EPSS score of 0.02% (5th percentile) indicates low real-world exploitation probability, consistent with the narrow attack surface of legacy NIS deployments. No active exploitation or public exploit code identified at time of analysis.
Calling wordexp with WRDE_REUSE in conjunction with WRDE_APPEND in the GNU C Library version 2.0 to version 2.42 may cause the interface to return uninitialized memory in the we_wordv member, which on subsequent calls to wordfree may abort the process. [CVSS 7.5 HIGH]
Stack memory disclosure in GNU C Library versions 2.0-2.42 allows unauthenticated remote attackers to leak sensitive stack contents via crafted DNS queries when getnetbyaddr functions are configured to use the DNS backend for network lookups. This vulnerability affects systems running vulnerable Glibc and DNS resolver combinations, with no available patch currently released.
Glibc versions 2.30 through 2.42 contain an integer overflow in the memalign function family that allows attackers with control over both size and alignment parameters to trigger heap corruption. Public exploit code exists for this vulnerability, which requires carefully crafted inputs with alignment values between 2^62+1 and 2^63 paired with sizes near PTRDIFF_MAX. Local attackers exploiting this flaw could achieve code execution or denial of service on affected systems.
A security vulnerability in the GNU C Library (CVSS 5.6). Remediation should follow standard vulnerability management procedures.
A security vulnerability in the GNU C Library (CVSS 5.6). Remediation should follow standard vulnerability management procedures.
Untrusted LD_LIBRARY_PATH environment variable vulnerability in the GNU C Library version 2.27 to 2.38 allows attacker controlled loading of dynamically shared library in statically compiled setuid. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. Public exploit code available.
Heap-based off-by-one buffer overflow in glibc's __vsyslog_internal function affects versions 2.37 and newer, triggered when syslog() or vsyslog() are invoked with messages exceeding INT_MAX bytes. Remote attackers can cause application crashes (denial of service) and potentially impact integrity in applications that log attacker-controlled data via syslog. Publicly available exploit code exists, though EPSS exploitation probability remains moderate at 0.65% (71st percentile) and the issue is not listed in CISA KEV.
Local privilege escalation in GNU glibc 2.36 and newer arises from a heap-based buffer overflow in __vsyslog_internal, reachable via the syslog/vsyslog interfaces when openlog was not called (or called with a NULL ident) and argv[0]'s basename exceeds 1024 bytes. Any setuid/setgid binary on affected Linux distributions (including Fedora 38 and 39) that invokes syslog can be leveraged by a local attacker to crash the process or escalate privileges to root. Publicly available exploit code exists and EPSS sits at the 96th percentile, signaling meaningful real-world risk despite the local attack vector.
Buffer overflow in glibc's obsolete NIS authentication function allows remote attackers to compromise integrity and availability via spoofed UDP responses. Affects all glibc versions through 2.43, but exploitation requires the target application to actively use the deprecated nis_local_principal function (obsolete since glibc 2.26). EPSS score of 0.02% (5th percentile) indicates low real-world exploitation probability, consistent with the narrow attack surface of legacy NIS deployments. No active exploitation or public exploit code identified at time of analysis.
Calling wordexp with WRDE_REUSE in conjunction with WRDE_APPEND in the GNU C Library version 2.0 to version 2.42 may cause the interface to return uninitialized memory in the we_wordv member, which on subsequent calls to wordfree may abort the process. [CVSS 7.5 HIGH]
Stack memory disclosure in GNU C Library versions 2.0-2.42 allows unauthenticated remote attackers to leak sensitive stack contents via crafted DNS queries when getnetbyaddr functions are configured to use the DNS backend for network lookups. This vulnerability affects systems running vulnerable Glibc and DNS resolver combinations, with no available patch currently released.
Glibc versions 2.30 through 2.42 contain an integer overflow in the memalign function family that allows attackers with control over both size and alignment parameters to trigger heap corruption. Public exploit code exists for this vulnerability, which requires carefully crafted inputs with alignment values between 2^62+1 and 2^63 paired with sizes near PTRDIFF_MAX. Local attackers exploiting this flaw could achieve code execution or denial of service on affected systems.
A security vulnerability in the GNU C Library (CVSS 5.6). Remediation should follow standard vulnerability management procedures.
A security vulnerability in the GNU C Library (CVSS 5.6). Remediation should follow standard vulnerability management procedures.
Untrusted LD_LIBRARY_PATH environment variable vulnerability in the GNU C Library version 2.27 to 2.38 allows attacker controlled loading of dynamically shared library in statically compiled setuid. Rated high severity (CVSS 7.8), this vulnerability is no authentication required, low attack complexity. Public exploit code available.
Heap-based off-by-one buffer overflow in glibc's __vsyslog_internal function affects versions 2.37 and newer, triggered when syslog() or vsyslog() are invoked with messages exceeding INT_MAX bytes. Remote attackers can cause application crashes (denial of service) and potentially impact integrity in applications that log attacker-controlled data via syslog. Publicly available exploit code exists, though EPSS exploitation probability remains moderate at 0.65% (71st percentile) and the issue is not listed in CISA KEV.
Local privilege escalation in GNU glibc 2.36 and newer arises from a heap-based buffer overflow in __vsyslog_internal, reachable via the syslog/vsyslog interfaces when openlog was not called (or called with a NULL ident) and argv[0]'s basename exceeds 1024 bytes. Any setuid/setgid binary on affected Linux distributions (including Fedora 38 and 39) that invokes syslog can be leveraged by a local attacker to crash the process or escalate privileges to root. Publicly available exploit code exists and EPSS sits at the 96th percentile, signaling meaningful real-world risk despite the local attack vector.