CVE-2026-98787: Linux vulnerability

CVE-2026-98787: bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch()

In the Linux kernel, the following vulnerability has been resolved: bpf: Fix missing migration protection in __rhtab_map_lookup_and_delete_batch() bpf_mem_cache_free_rcu() uses this_cpu_ptr() which requires migration to be disabled. All callers of rhtab_delete_elem() disable migration except __rhtab_map_lookup_and_delete_batch(), which calls it under rcu_read_lock() only. On CONFIG_PREEMPT_RCU, rcu_read_lock() does not disable preemption or migration, so the task can migrate between CPUs during the delete loop, causing this_cpu_ptr() to trigger: BUG: using smp_processor_id() in preemptible [00000000] code Fix by wrapping the delete loop in migrate_disable()/migrate_enable() in __rhtab_map_lookup_and_delete_batch(), matching the migration protection that the other callers already provide.

UnknownCVSS not scoredNot KEV-listedUpdatedOct 18, 2026, 15:48 UTC (UTC+00:00)

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Oct 18, 2026, 15:48 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

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0CVSS vectors

3Timeline events

0ADP providers

3Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
Sep 25, 2026, 10:25 UTC (UTC+00:00)
CVE publishedCVE Program
The CVE record was published.
Oct 18, 2026, 15:48 UTC (UTC+00:00)
CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
Oct 18, 2026, 15:48 UTC (UTC+00:00)

Source materials

CVE List V5 sourceCVE List V5
https://git.kernel.org/stable/c/94f41ec5fa578765b74ad5736c2f029e7aabc46dCVE reference, Linux
https://git.kernel.org/stable/c/de020dc8049bfb2b22e3b6d99c031feb2e22d112CVE reference, Linux

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

LinuxLinux818e0084822742fc00eacbf5df3476a5e72c7d0e, 818e0084822742fc00eacbf5df3476a5e72c7d0eunaffected

LinuxLinux7.2, 0, 7.2.10, 7.3-rc6affected

Weakness

CWE details

No CWE listed

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