{"id":"CVE-2023-2235","title":"A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation.\n\n\n\nThe perf_group_detach function did not check the event's siblings' attach_state before calling add_ev…","summary":"A use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation.\n\n\n\nThe perf_group_detach function did not check the event's siblings' attach_state before calling add_ev…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416","CWE-416"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.13, < 5.15.104","linux_kernel >= 5.16, < 6.1.21","linux_kernel >= 6.2, < 6.2.8"],"patched":["linux_kernel 6.2.8"],"published":"2023-05-01","updated":"2026-08-07","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-2235","references":[{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fd0815f632c24878e325821943edccc7fde947a2","label":"cve-coordination@google.com"},{"url":"https://kernel.dance/fd0815f632c24878e325821943edccc7fde947a2","label":"cve-coordination@google.com"},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fd0815f632c24878e325821943edccc7fde947a2","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://kernel.dance/fd0815f632c24878e325821943edccc7fde947a2","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://security.netapp.com/advisory/ntap-20230609-0002/","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00248,"epssPercentile":0.16403,"ingestedAt":"2026-08-07T20:16:40.356Z","slug":"CVE-2023-2235","body":"## Overview\n\nA use-after-free vulnerability in the Linux Kernel Performance Events system can be exploited to achieve local privilege escalation.\n\n\n\nThe perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.\n\n\n\nWe recommend upgrading past commit fd0815f632c24878e325821943edccc7fde947a2.\n\n## Affected\n\n- `linux_kernel >= 5.13, < 5.15.104`\n- `linux_kernel >= 5.16, < 6.1.21`\n- `linux_kernel >= 6.2, < 6.2.8`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.2.8`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}