{"id":"CVE-2026-53106","title":"bpf: Do not allow deleting local storage in NMI","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Do not allow deleting local storage in NMI\n\nCurrently, local storage may deadlock when deferring freeing selem or\nlocal storage through kfree_rcu(), call_rcu() or …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= a10787e6d58c24b51e91c19c6d16c5da89fcaa4b < e84acaf936970b5b0be2c93bbf255295ba9406df","Linux >= a10787e6d58c24b51e91c19c6d16c5da89fcaa4b < 350de5b8a9befaa2a68861c51f671d4f5f751ca5","Linux 5.13"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:18:55.220576Z"},"published":"2026-06-24","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:24:00.474Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-53106","references":[{"url":"https://git.kernel.org/stable/c/e84acaf936970b5b0be2c93bbf255295ba9406df"},{"url":"https://git.kernel.org/stable/c/350de5b8a9befaa2a68861c51f671d4f5f751ca5"}],"tags":["cve.org"],"epss":0.00143,"epssPercentile":0.03654,"ingestedAt":"2026-11-06T16:57:43.290Z","slug":"CVE-2026-53106","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Do not allow deleting local storage in NMI\n\nCurrently, local storage may deadlock when deferring freeing selem or\nlocal storage through kfree_rcu(), call_rcu() or call_rcu_tasks_trace()\nin NMI or reentrant. Since deleting selem in NMI is an unlikely use\ncase, partially mitigate it by returning error when calling from\nbpf_xxx_storage_delete() helpers in NMI. Note that, it is still possible\nto deadlock through reentrant. A full mitigation requires returning\nerror when irqs_disabled() is true, which, however is too heavy-handed\nfor bpf_xxx_storage_delete().\n\nThe long-term solution requires _nolock versions of call_rcu. Another\npossible solution is to defer the free through irq_work [0], but it\nwould grow the size of selem, which is non-ideal.\n\nThe check is only needed in bpf_selem_unlink(), which is used by helpers\nand syscalls. bpf_selem_unlink_nofail() is fine as it is called during\nmap and owner tear down that never run in NMI or reentrant.\n\n[0] https://lore.kernel.org/bpf/20260205190233.912-1-alexei.starovoitov@gmail.com/\n\n## Affected\n\n- `Linux >= a10787e6d58c24b51e91c19c6d16c5da89fcaa4b < e84acaf936970b5b0be2c93bbf255295ba9406df`\n- `Linux >= a10787e6d58c24b51e91c19c6d16c5da89fcaa4b < 350de5b8a9befaa2a68861c51f671d4f5f751ca5`\n- `Linux 5.13`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}