{"resultsPerPage":1,"startIndex":0,"totalResults":1,"format":"NVD_CVE","version":"2.0","timestamp":"2026-06-07T23:09:19.539","vulnerabilities":[{"cve":{"id":"CVE-2026-3904","sourceIdentifier":"3ff69d7a-14f2-4f67-a097-88dee7810d18","published":"2026-03-11T14:16:30.113","lastModified":"2026-04-09T20:31:38.103","vulnStatus":"Analyzed","cveTags":[],"descriptions":[{"lang":"en","value":"Calling NSS-backed functions that support caching via nscd may call the \nnscd client side code and in the GNU C Library version 2.36 under high \nload on x86_64 systems, the client may call memcmp on inputs that are \nconcurrently modified by other processes or threads and crash.\n\n\n\n\nThe nscd client in the GNU C Library uses the memcmp function with \ninputs that may be concurrently modified by another thread, potentially \nresulting in spurious cache misses, which in itself is not a security \nissue.  However in the GNU C Library version 2.36 an optimized \nimplementation of memcmp was introduced for x86_64 which could crash \nwhen invoked with such undefined behaviour, turning this into a \npotential crash of the nscd client and the application that uses it. \nThis implementation was backported to the 2.35 branch, making the nscd \nclient in that branch vulnerable as well.  Subsequently, the fix for \nthis issue was backported to all vulnerable branches in the GNU C \nLibrary repository.\n\n\nIt is advised that distributions that may have cherry-picked the memcpy \nSSE2 optimization in their copy of the GNU C Library, also apply the fix \nto avoid the potential crash in the nscd client."},{"lang":"es","value":"Llamar a funciones respaldadas por NSS que soportan el almacenamiento en caché a través de nscd puede llamar al código del lado del cliente de nscd y en la biblioteca GNU C versión 2.36 bajo alta carga en sistemas x86_64, el cliente puede llamar a memcmp en entradas que son modificadas concurrentemente por otros procesos o hilos y colapsar.\n\nEl cliente nscd en la biblioteca GNU C utiliza la función memcmp con entradas que pueden ser modificadas concurrentemente por otro hilo, lo que puede resultar en fallos de caché espurios, lo cual en sí mismo no es un problema de seguridad. Sin embargo, en la biblioteca GNU C versión 2.36 se introdujo una implementación optimizada de memcmp para x86_64 que podría colapsar cuando se invoca con dicho comportamiento indefinido, convirtiendo esto en un posible colapso del cliente nscd y de la aplicación que lo utiliza. Esta implementación fue retroportada a la rama 2.35, haciendo que el cliente nscd en esa rama también sea vulnerable. Posteriormente, la corrección 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 optimización memcpy SSE2 en su copia de la biblioteca GNU C, también apliquen la corrección para evitar el posible colapso en el cliente nscd."}],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":6.2,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":2.5,"impactScore":3.6}]},"weaknesses":[{"source":"3ff69d7a-14f2-4f67-a097-88dee7810d18","type":"Secondary","description":[{"lang":"en","value":"CWE-366"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:gnu:glibc:*:*:*:*:*:*:*:*","versionStartIncluding":"2.35","versionEndExcluding":"2.37","matchCriteriaId":"4D015406-4E4F-435F-85C8-3FC346FA1B22"}]}]}],"references":[{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=29863","source":"3ff69d7a-14f2-4f67-a097-88dee7810d18","tags":["Exploit","Issue Tracking","Patch"]},{"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":["Third Party Advisory"]},{"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":"3ff69d7a-14f2-4f67-a097-88dee7810d18","tags":["Patch"]},{"url":"http://www.openwall.com/lists/oss-security/2026/03/11/5","source":"af854a3a-2127-422b-91ae-364da2661108","tags":["Mailing List","Third Party Advisory"]}]}}]}