{"id":"CVE-2026-3904","aliases":["BELL-CVE-2026-3904","DEBIAN-CVE-2026-3904","EUVD-2026-11160","GHSA-3584-5r39-4gm3","RHSA-2026:7316","UBUNTU-CVE-2026-3904"],"status":"published","title":"Calling NSS-backed functions that support caching via nscd may call the \nnscd client side code...","description":"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.","severity":{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp","from":"cve"},"epss":{"day":"2026-11-11","score":0.00164,"percentile":0.05709,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-366"],"published":"2026-03-11T13:19:09Z","modified":"2026-10-28T02:30:36Z","fixes":[{"ecosystem":"Debian:12","package":"glibc","fixed_in":["2.36-9"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"glibc","fixed_in":["2.36-9"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"glibc","fixed_in":["2.36-9"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.36-9"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.36-9"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"glibc","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.36-9"}]}]},{"source":"osv","ecosystem":"Red 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Hat:hummingbird:1","package":"glibc-langpack-ts","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.42-11.1.hum1"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"glibc-langpack-tt","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.42-11.1.hum1"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"glibc-langpack-ug","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.42-11.1.hum1"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"glibc-langpack-uk","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.42-11.1.hum1"}]}],"bundled":6},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"glibc-langpack-unm","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:2.42-11.1.hum1"}]}],"bundled":6}],"affected_more":24,"products":[{"vendor":"gnu","product":"glibc"},{"vendor":"siemens","product":"simatic s7-1500 cpu 1518-4 pn/dp mfp"},{"vendor":"siemens","product":"simatic s7-1500 cpu 1518f-4 pn/dp mfp"},{"vendor":"siemens","product":"siplus s7-1500 cpu 1518-4 pn/dp mfp"},{"vendor":"the gnu c library","product":"glibc"}],"references":[{"url":"https://sourceware.org/git/?p=glibc.git;a=blob_plain;f=advisories/GLIBC-SA-2026-0004;hb=HEAD","tags":["Third Party Advisory","advisory","article"]},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=29863","tags":["Exploit","Issue Tracking","Patch","report","article"]},{"url":"https://sourceware.org/git/?p=glibc.git;a=commit;h=8804157ad9da39631703b92315460808eac86b0c","tags":["Patch","web","article"]},{"url":"https://sourceware.org/git/?p=glibc.git;a=commit;h=b712be52645282c706a5faa038242504feb06db5","tags":["Patch","web","article"]},{"url":"http://www.openwall.com/lists/oss-security/2026/03/11/5","tags":["Mailing List","Third Party Advisory","web"]},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-082556.html","tags":["web"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-3904","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-3584-5r39-4gm3"},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-3904","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/3xxx/CVE-2026-3904.json","tags":["advisory"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-3904","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:7316","tags":["advisory"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-3904","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2025-15281","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-4438","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-4437","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-0915","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-0861","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_7316.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2431196","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2025-15281","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-15281","tags":["advisory"]},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=33814","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2429771","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-0861","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-0861","tags":["advisory"]},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=33796","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2430201","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-0915","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-0915","tags":["advisory"]},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=33802","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2446533","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-3904","tags":["advisory","report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2449777","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-4437","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4437","tags":["advisory"]},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34014","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2449783","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-4438","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-4438","tags":["advisory"]},{"url":"https://sourceware.org/bugzilla/show_bug.cgi?id=34015","tags":["article"]},{"url":"https://ubuntu.com/security/CVE-2026-3904","tags":["report"]},{"url":"https://sourceware.org/git/?p=glibc.git;a=blob;f=advisories/GLIBC-SA-2026-0004","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2026-3904","description":"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.","status":"published","published":"2026-03-11T13:19:09.741Z","modified":"2026-10-15T01:12:06.14Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"adp"}],"cwes":["CWE-366"],"updated_at":"2026-11-02T13:48:58.05327Z"}],"euvd":[{"id":"EUVD-2026-11160","description":"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.","status":"published","published":"2026-03-11T13:19:09Z","modified":"2026-10-15T01:12:06Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T17:27:06.951216Z"}],"ghsa":[{"id":"GHSA-3584-5r39-4gm3","title":"Calling NSS-backed functions that support caching via nscd may call the \nnscd client side code...","description":"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.","status":"published","published":"2026-03-11T15:31:52Z","modified":"2026-07-14T15:32:45Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-366"],"updated_at":"2026-11-02T15:09:27.635559Z"}],"nvd":[{"id":"CVE-2026-3904","description":"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.","status":"published","published":"2026-03-11T14:16:30.113Z","modified":"2026-07-14T13:18:50.64Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"secondary"}],"cwes":["CWE-366"],"updated_at":"2026-11-02T14:12:08.98071Z"}],"osv":[{"id":"BELL-CVE-2026-3904","title":"CVE-2026-3904 does not affect BellSoft software","status":"withdrawn","published":"2026-03-13T06:08:19.74256Z","modified":"2026-03-17T07:25:02.752028Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:28:23.572955Z"},{"id":"CVE-2026-3904","description":"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.","status":"published","published":"2026-03-11T13:19:09.741Z","modified":"2026-10-28T02:30:36.784267118Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-366"],"updated_at":"2026-11-02T15:45:03.040464Z"},{"id":"DEBIAN-CVE-2026-3904","description":"Calling NSS-backed functions that support caching via nscd may call the  nscd client side code and in the GNU C Library version 2.36 under high  load on x86_64 systems, the client may call memcmp on inputs that are  concurrently modified by other processes or threads and crash.     The nscd client in the GNU C Library uses the memcmp function with  inputs that may be concurrently modified by another thread, potentially  resulting in spurious cache misses, which in itself is not a security  issue.  However in the GNU C Library version 2.36 an optimized  implementation of memcmp was introduced for x86_64 which could crash  when invoked with such undefined behaviour, turning this into a  potential crash of the nscd client and the application that uses it.  This implementation was backported to the 2.35 branch, making the nscd  client in that branch vulnerable as well.  Subsequently, the fix for  this issue was backported to all vulnerable branches in the GNU C  Library repository.   It is advised that distributions that may have cherry-picked the memcpy  SSE2 optimization in their copy of the GNU C Library, also apply the fix  to avoid the potential crash in the nscd client.","status":"published","published":"2026-03-11T14:16:30.113Z","modified":"2026-10-01T03:03:11.26415334Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:54.892385Z"},{"id":"RHSA-2026:7316","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update","status":"published","published":"2026-04-21T10:09:51Z","modified":"2026-10-15T10:26:21Z","cvss":[{"version":"3.1","score":8.1,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:22.928316Z"},{"id":"UBUNTU-CVE-2026-3904","description":"(Calling NSS-backed functions that support caching via nscd may call th ...)","status":"withdrawn","published":"2026-03-12T00:00:00Z","modified":"2026-03-16T06:38:41.036088Z","cvss":[{"version":"3.1","score":6.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T16:56:16.686388Z"}]}}