{"id":"CVE-2026-52971","summary":"net: ena: PHC: Fix potential use-after-free in get_timestamp","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: PHC: Fix potential use-after-free in get_timestamp\n\nMove the phc-\u003eactive check and resp pointer assignment to after\nacquiring the spinlock. Previously, phc-\u003eactive was checked without\nholding the lock, and resp was cached from ena_dev-\u003ephc.virt_addr\nbefore the lock was acquired.\n\nIf ena_com_phc_destroy() runs between the lockless active check and\nthe lock acquisition, it sets active=false, releases the lock, frees\nthe DMA memory, and sets virt_addr=NULL. The get_timestamp path would\nthen read a NULL virt_addr and dereference it.\n\nWith both the active check and the pointer read under the lock,\ndestroy cannot free the memory while get_timestamp is using it.","modified":"2026-07-08T08:13:46.487825604Z","published":"2026-06-24T16:28:49.637Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52971.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52971.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52971"},{"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":"e0ea34158ee8c4f7536cd781010339ff28c0d24c"},{"fixed":"95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98"},{"fixed":"ca9ed40f28949353911dcb524ff8fff2f3409c97"},{"fixed":"e42c755582f0960e684298762f0ab927b3778376"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52971.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.18.33"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52971.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}