{"id":"CVE-2025-38008","summary":"mm/page_alloc: fix race condition in unaccepted memory handling","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmm/page_alloc: fix race condition in unaccepted memory handling\n\nThe page allocator tracks the number of zones that have unaccepted memory\nusing static_branch_enc/dec() and uses that static branch in hot paths to\ndetermine if it needs to deal with unaccepted memory.\n\nBorislav and Thomas pointed out that the tracking is racy: operations on\nstatic_branch are not serialized against adding/removing unaccepted pages\nto/from the zone.\n\nSanity checks inside static_branch machinery detects it:\n\nWARNING: CPU: 0 PID: 10 at kernel/jump_label.c:276 __static_key_slow_dec_cpuslocked+0x8e/0xa0\n\nThe comment around the WARN() explains the problem:\n\n\t/*\n\t * Warn about the '-1' case though; since that means a\n\t * decrement is concurrent with a first (0-\u003e1) increment. IOW\n\t * people are trying to disable something that wasn't yet fully\n\t * enabled. This suggests an ordering problem on the user side.\n\t */\n\nThe effect of this static_branch optimization is only visible on\nmicrobenchmark.\n\nInstead of adding more complexity around it, remove it altogether.","modified":"2026-04-02T12:47:43.986065Z","published":"2025-06-18T09:28:19.358Z","related":["SUSE-SU-2025:21040-1","SUSE-SU-2025:21052-1","SUSE-SU-2025:21056-1","SUSE-SU-2025:21064-1","SUSE-SU-2025:21074-1","SUSE-SU-2025:21139-1","SUSE-SU-2025:21179-1","SUSE-SU-2025:4057-1","SUSE-SU-2025:4128-1","SUSE-SU-2025:4132-1","SUSE-SU-2025:4140-1","SUSE-SU-2025:4141-1","SUSE-SU-2025:4301-1","openSUSE-SU-2025:20081-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38008.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/71dda1cb10702dc2859f00eb789b0502de2176a9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/74953f93f47a45296cc2a3fd04e2a3202ff3fa53"},{"type":"WEB","url":"https://git.kernel.org/stable/c/98fdd2f612e949c652693f6df00442c81037776d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fefc075182275057ce607effaa3daa9e6e3bdc73"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38008.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38008"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"dcdfdd40fa82b6704d2841938e5c8ec3051eb0d6"},{"fixed":"98fdd2f612e949c652693f6df00442c81037776d"},{"fixed":"74953f93f47a45296cc2a3fd04e2a3202ff3fa53"},{"fixed":"71dda1cb10702dc2859f00eb789b0502de2176a9"},{"fixed":"fefc075182275057ce607effaa3daa9e6e3bdc73"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38008.json"}}],"schema_version":"1.7.5"}