{"id":"CVE-2026-52971","revision":"fc87c7c29f244ca8aa0fb4170810d1bd","records":[{"revision":"fc87c7c29f244ca8aa0fb4170810d1bd","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-52971","aliases":[],"title":"net: ena: PHC: Fix potential use-after-free in get_timestamp","description":"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->active check and resp pointer assignment to after\nacquiring the spinlock. Previously, phc->active was checked without\nholding the lock, and resp was cached from ena_dev->phc.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.","state":0,"publishedAt":"2026-06-24T16:28:49.637+00:00","modifiedAt":"2026-10-19T19:47:11.012+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/amazon/ena/ena_com.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"e0ea34158ee8c4f7536cd781010339ff28c0d24c\",\n                            \"lessThan\": \"95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e0ea34158ee8c4f7536cd781010339ff28c0d24c\",\n                            \"lessThan\": \"ca9ed40f28949353911dcb524ff8fff2f3409c97\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e0ea34158ee8c4f7536cd781010339ff28c0d24c\",\n                            \"lessThan\": \"e42c755582f0960e684298762f0ab927b3778376\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/net/ethernet/amazon/ena/ena_com.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.17\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.17\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.33\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.0.10\",\n                            \"lessThanOrEqual\": \"7.0.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/95e8ae9af2a61b4e72f5c585bf4c7d8aaf2a2c98","https://git.kernel.org/stable/c/ca9ed40f28949353911dcb524ff8fff2f3409c97","https://git.kernel.org/stable/c/e42c755582f0960e684298762f0ab927b3778376"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-52971","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-52971","identifiers":["CVE-2026-52971"]},"retained":false,"historicalAffected":[]}],"coverage":[]}