{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3904", "assignerOrgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "state": "PUBLISHED", "assignerShortName": "glibc", "dateReserved": "2026-03-10T19:52:49.054Z", "datePublished": "2026-03-11T13:19:09.741Z", "dateUpdated": "2026-03-11T15:56:23.027Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "3ff69d7a-14f2-4f67-a097-88dee7810d18", "shortName": "glibc", "dateUpdated": "2026-03-11T13:19:09.741Z"}, "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-366", "description": "CWE-366 Race condition within a thread", "type": "CWE"}]}], "affected": [{"vendor": "The GNU C Library", "product": "glibc", "platforms": ["x86"], "versions": [{"status": "affected", "version": "2.35", "lessThan": "2.37", "versionType": "custom"}], "defaultStatus": "unaffected"}], "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.\u00a0 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.\u00a0 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.", "supportingMedia": [{"type": "text/html", "base64": false, "value": "<div>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.</div><div><br></div><div>The 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.&nbsp; 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{"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"}], "created": "2026-03-12T10:05:58.465711+00:00", "updated": "2026-03-12T10:05:58.465822+00:00", "vendors": ["the_gnu_c_library", "the_gnu_c_library$PRODUCT$glibc"]}