CVE-2026-89988 (GCVE-0-2026-89988)
Vulnerability from cvelistv5
Published
2026-09-16 10:33
Modified
2026-10-19 08:56
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: kprobes: Protect kprobe_blacklist with RCU __within_kprobe_blacklist() traverses kprobe_blacklist without holding kprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist() removes blacklist entries and immediately frees them with kfree(). A concurrent call to within_kprobe_blacklist() can therefore dereference freed memory. Furthermore, within_kprobe_blacklist() can be called in atomic or non-preemptible contexts where the sleeping kprobe_mutex cannot be taken. Protect kprobe_blacklist with RCU. Use guard(rcu)() and list_for_each_entry_rcu() for traversal, list_add_tail_rcu() for insertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim entries safely after a grace period.
References
Impacted products
Vendor Product Version
Linux Linux Version: 376e242429bf8539ef39a080ac113c8799840b13
Version: 376e242429bf8539ef39a080ac113c8799840b13
Version: 376e242429bf8539ef39a080ac113c8799840b13
Version: 376e242429bf8539ef39a080ac113c8799840b13
Version: 376e242429bf8539ef39a080ac113c8799840b13
Version: 376e242429bf8539ef39a080ac113c8799840b13
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{
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      "cpeApplicability": [
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          "nodes": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkprobes: Protect kprobe_blacklist with RCU\n\n__within_kprobe_blacklist() traverses kprobe_blacklist without holding\nkprobe_mutex. When a module is unloaded, kprobe_remove_area_blacklist()\nremoves blacklist entries and immediately frees them with kfree().\nA concurrent call to within_kprobe_blacklist() can therefore dereference\nfreed memory.\n\nFurthermore, within_kprobe_blacklist() can be called in atomic or\nnon-preemptible contexts where the sleeping kprobe_mutex cannot be taken.\n\nProtect kprobe_blacklist with RCU. Use guard(rcu)() and\nlist_for_each_entry_rcu() for traversal, list_add_tail_rcu() for\ninsertions, list_del_rcu() for deletions, and kfree_rcu() to reclaim\nentries safely after a grace period."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The UAF is reached only via local syscalls: x86 perf_event_open() hardware execute breakpoints and register_kprobe() (tracefs, perf kprobes, BPF). It is not invoked from network packet processing or a remote service.\nAC:L - An attacker can loop the blacklist walk while concurrently causing module COMING/GOING so kprobe_remove_area_blacklist() does list_del/kfree, creating both sides of the race. Attacker-driven use-after-free races are AC:L.\nPR:L - x86 hw_breakpoint_arch_parse() calls within_kprobe_blacklist() for kernel execute breakpoints during perf_event_open() before hw_breakpoint_parse()\u0027s CAP_SYS_ADMIN check, so an unprivileged user can trigger the walk. Module autoload via request_module() can mutate the list without CAP_SYS_MODULE.\nUI:N - The attacker triggers the race with their own syscalls (perf_event_open and module autoload/unload). No separate victim action is required.\nS:U - The bug is kernel-heap use-after-free in kprobes. Effects stay inside the kernel\u0027s security authority and do not cross a VM, IOMMU, or other boundary.\nC:H - Concurrent walk versus kfree of struct kprobe_blacklist_entry is a heap use-after-free. Reclaiming the object yields an arbitrary kernel read primitive, so confidentiality impact is high.\nI:H - A heap use-after-free on a list node is exploitable via heap spraying for an arbitrary write and control-flow hijack, so integrity impact is high.\nA:H - Following the freed blacklist entry\u0027s next pointer or fields causes a kernel oops or panic, taking down the system."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:56:02.663Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/8f406205003f741225f620f0e357ca0de71d45e3"
        },
        {
          "url": "https://git.kernel.org/stable/c/630ed8734a02b992e8a97538179c2ece42c5210f"
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          "url": "https://git.kernel.org/stable/c/518d9b5568bb06f86e4434f7a30faa9612ea91ad"
        },
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          "url": "https://git.kernel.org/stable/c/5da247e4d1e8661d4d6f997101d59967e8994e32"
        },
        {
          "url": "https://git.kernel.org/stable/c/6e62cf983a2bd547e6bbd3f935539233e5f97f8f"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c4256196b3a105307e2235fbfd85e768bbcdd0f"
        }
      ],
      "title": "kprobes: Protect kprobe_blacklist with RCU",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89988",
    "datePublished": "2026-09-16T10:33:03.003Z",
    "dateReserved": "2026-09-11T19:38:34.779Z",
    "dateUpdated": "2026-10-19T08:56:02.663Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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