CVE-2026-3904

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Sin embargo, en la biblioteca GNU C versi\u00f3n 2.36 se introdujo una implementaci\u00f3n optimizada de memcmp para x86_64 que podr\u00eda colapsar cuando se invoca con dicho comportamiento indefinido, convirtiendo esto en un posible colapso del cliente nscd y de la aplicaci\u00f3n que lo utiliza. Esta implementaci\u00f3n fue retroportada a la rama 2.35, haciendo que el cliente nscd en esa rama tambi\u00e9n sea vulnerable. Posteriormente, la correcci\u00f3n para este problema fue retroportada a todas las ramas vulnerables en el repositorio de la biblioteca GNU C.\n\nSe aconseja que las distribuciones que puedan haber seleccionado la optimizaci\u00f3n memcpy SSE2 en su copia de la biblioteca GNU C, tambi\u00e9n apliquen la correcci\u00f3n para evitar el posible colapso en el cliente nscd."}], "id": "CVE-2026-3904", "lastModified": "2026-07-14T13:18:50.640", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 6.2, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-3904", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-03-11T15:56:03.349329Z", "version": "2.0.3"}}]}, "published": "2026-03-11T14:16:30.113", "references": [{"source": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "tags": ["Exploit", "Issue Tracking", "Patch"], "url": "https://sourceware.org/bugzilla/show_bug.cgi?id=29863"}, {"source": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "tags": ["Third Party Advisory"], "url": "https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0004;hb=HEAD"}, {"source": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "tags": ["Patch"], "url": "https://sourceware.org/git/?p=glibc.git;a=commit;h=8804157ad9da39631703b92315460808eac86b0c"}, {"source": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "tags": ["Patch"], "url": "https://sourceware.org/git/?p=glibc.git;a=commit;h=b712be52645282c706a5faa038242504feb06db5"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2026/03/11/5"}, {"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "url": "https://cert-portal.siemens.com/productcert/html/ssa-082556.html"}], "sourceIdentifier": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-366"}], "source": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "type": "Secondary"}]}

{"bugzilla": {"description": "glibc: nscd client crash on x86_64 under high nscd load", "id": "2446533", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2446533"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-366", "details": ["A flaw was found in glibc. When calling NSS-backed functions that support caching via nscd, the nscd client under high load on x86_64 systems may call the memcmp function on inputs that are concurrently modified by other processes or threads, causing a crash and resulting in a denial of service."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-3904", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "compat-glibc", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "compat-glibc", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "glibc", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "rhcos", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-03-11T13:19:09Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-3904\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-3904\nhttps://sourceware.org/bugzilla/show_bug.cgi?id=29863\nhttps://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0004;hb=HEAD\nhttps://sourceware.org/git/?p=glibc.git;a=commit;h=8804157ad9da39631703b92315460808eac86b0c\nhttps://sourceware.org/git/?p=glibc.git;a=commit;h=b712be52645282c706a5faa038242504feb06db5"], "statement": "This issue is only exploitable via applications using NSS-backed functions that support caching via nscd under a high load on x86_64 systems. It depends on a race condition on inputs that are concurrently modified by other processes or threads during memory access, increasing the complexity of exploitation. Also, this flaw can only cause an application crash, limiting the security impact to a denial of service. Due to these reasons, this vulnerability has been rated with a moderate severity.", "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": ["x86"], "status": "affected", "versions": {"scheme": "generic", "value": "[2.35,2.37)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "glibc", "source": "cna", "vendor": "The GNU C Library"}, "product": "glibc", "vendor": "the_gnu_c_library"}], "analysis": {"en": {"generated_at": "2026-04-09T21:29:23.094257+00:00", "value": {"mitigation_remediation": ["Apply the latest glibc patch that includes the memcmp fix for versions 2.36 and earlier branches that contain the SSE2 optimization.", "Verify that the glibc version in use does not contain the unpatched memcmp optimization or that the fix has been backported in your distribution.", "If an immediate patch is not possible, limit nscd load and monitor for further advisories while awaiting an update."], "summary": {"action": "Patch", "impact": "Denial of Service via nscd crash"}, "threat_synthesis": {"affected_systems": "The issue affects the GNU C Library (glibc) on 64\u2011bit x86 systems. Versions 2.36 and the 2.35 branch, as well as any releases where the SSE2 memcmp optimization was backported, are vulnerable. Distributions that cherry\u2011picked this optimization should also be considered at risk.", "description_and_impact": "The vulnerability arises when the GNU C Library\u2019s nscd client calls the memcmp function with inputs that may be modified concurrently by other threads. In glibc 2.36 and the backported 2.35 branch, an optimized memcmp on x86_64 can crash under these undefined conditions. This leads to a crash of the nscd client and any application that uses it, causing a denial\u2011of\u2011service. The weakness is classed as CWE\u2011366 (Concurrent Modification of Data).", "risk_and_exploitability": "The CVSS score of 6.2 indicates moderate severity, while the EPSS score of less than 1\u202f% suggests a low likelihood of exploitation, and the flaw is not listed in CISA\u2019s KEV catalog. The most probable attack vector is local or within the same host; an attacker can induce the crash by generating high load on nscd or by calling NSS\u2011backed functions that rely on the nscd client. Exploitation results in a crash that can be leveraged for denial of service, but it does not expose data or allow code execution."}}}}, "created": "2026-03-12T10:05:58.465711+00:00", "updated": "2026-04-10T09:46:31.398480+00:00", "vendors": ["the_gnu_c_library", "the_gnu_c_library$PRODUCT$glibc"]}