CVE-2026-98464 (GCVE-0-2026-98464)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:15 – Updated: 2026-10-24 14:08
VLAI
Title
RISC-V: KVM: Synchronize hrtimer callback during teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Synchronize hrtimer callback during teardown The non-Sstc hrtimer callback clears next_set before its final uses of the enclosing vCPU. If teardown observes next_set as false while the callback is still running, kvm_riscv_vcpu_timer_cancel() skips hrtimer_cancel() and kvm_destroy_vcpus() can free the vCPU before the callback enters kvm_riscv_vcpu_set_interrupt(). A guest can arm the timer with SBI TIME and request shutdown with SBI legacy shutdown or SRST. A VMM that honors KVM_EXIT_SYSTEM_EVENT and destroys the VM supplies the teardown side of the race; no post-launch host ioctl is needed to arm or request teardown. On upstream master 62cc90241548, generic KASAN reported: BUG: KASAN: slab-use-after-free in do_raw_spin_lock Write of size 4 at addr ff60000005e58898 kvm_riscv_vcpu_set_interrupt kvm_riscv_vcpu_hrtimer_expired __hrtimer_run_queues hrtimer_interrupt The object was allocated by KVM_CREATE_VCPU and freed concurrently by: kvm_destroy_vcpus kvm_arch_destroy_vm kvm_destroy_vm __fput For deterministic validation, I added mdelay(1000) immediately after the existing next_set = false assignment. This only widens the existing post-clear callback window. A no-delay trace build naturally reached the callback-after-teardown-start/before-deinit ordering in 12 of 200 runs, but 1,500 stock-kernel stress iterations did not produce a KASAN report, so natural reproduction is timing-sensitive. Always invoke hrtimer_cancel() for an initialized timer. Preserve the existing -EINVAL result when the timer is no longer set, but only after synchronizing with a running callback. With this patch, hrtimer_cancel() blocked for the full widened callback window before vCPU destruction. KASAN reported no error in 100 fixed-and-widened runs or 200 fix-only timing-sweep runs.
Severity
9.3 (Critical)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7056 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 , < 9bdbae64ae0dab93041ebc57ec4e93def793fc2d (git)
Affected: 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 , < 2af03b606aadaaeb386658ef798c79bdcdef87c1 (git)
Affected: 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 , < e66aced74f0122380603c9910a71d77618b28f0e (git)
Affected: 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 , < ea91f05a55b807ead3166546a2c75f4185ca645f (git)
Affected: 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 , < 3cc6184bd5920c9685d87f4e260568feba08650d (git)
Affected: 3a9f66cb25e18a3eeca36c08d9f823a35b3ddc22 , < aaad136d56d91252517272b68cd533e5714698d5 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.16
Unaffected: 0 , < 5.16 (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Synchronize hrtimer callback during teardown\n\nThe non-Sstc hrtimer callback clears next_set before its final uses of\nthe enclosing vCPU.  If teardown observes next_set as false while the\ncallback is still running, kvm_riscv_vcpu_timer_cancel() skips\nhrtimer_cancel() and kvm_destroy_vcpus() can free the vCPU before the\ncallback enters kvm_riscv_vcpu_set_interrupt().\n\nA guest can arm the timer with SBI TIME and request shutdown with SBI\nlegacy shutdown or SRST.  A VMM that honors KVM_EXIT_SYSTEM_EVENT and\ndestroys the VM supplies the teardown side of the race; no post-launch\nhost ioctl is needed to arm or request teardown.\n\nOn upstream master 62cc90241548, generic KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in do_raw_spin_lock\n  Write of size 4 at addr ff60000005e58898\n\n  kvm_riscv_vcpu_set_interrupt\n  kvm_riscv_vcpu_hrtimer_expired\n  __hrtimer_run_queues\n  hrtimer_interrupt\n\nThe object was allocated by KVM_CREATE_VCPU and freed concurrently by:\n\n  kvm_destroy_vcpus\n  kvm_arch_destroy_vm\n  kvm_destroy_vm\n  __fput\n\nFor deterministic validation, I added mdelay(1000) immediately after\nthe existing next_set = false assignment.  This only widens the\nexisting post-clear callback window.  A no-delay trace build naturally\nreached the callback-after-teardown-start/before-deinit ordering in 12\nof 200 runs, but 1,500 stock-kernel stress iterations did not produce a\nKASAN report, so natural reproduction is timing-sensitive.\n\nAlways invoke hrtimer_cancel() for an initialized timer.  Preserve the\nexisting -EINVAL result when the timer is no longer set, but only after\nsynchronizing with a running callback.\n\nWith this patch, hrtimer_cancel() blocked for the full widened callback\nwindow before vCPU destruction.  KASAN reported no error in 100\nfixed-and-widened runs or 200 fix-only timing-sweep runs."
        }
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            "version": "3.1"
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              "value": "AV:L - Under KVM_RUN, a guest supervisor ECALL follows kvm_riscv_vcpu_exit()-\u003ekvm_riscv_vcpu_sbi_ecall(); SBI TIME arms kvm_riscv_vcpu_update_hrtimer(), while shutdown/SRST drives teardown to the patched kvm_riscv_vcpu_timer_cancel(). This is local guest/hypervisor input, not a network protocol.\nAC:L - On a non-Sstc host, the guest chooses the timer deadline through SBI TIME and immediately issues shutdown/SRST, causing VMM teardown while the callback runs. The attacker creates both sides of the race, so the short scheduling window does not impose an attacker-uncontrollable condition.\nPR:N - kvm_riscv_vcpu_sbi_ecall() dispatches TIME and SRST or legacy shutdown from an already-running guest without any host credential or capability check; guest S-mode is within the untrusted VM authority, so no privilege in host KVM is required.\nUI:N - kvm_riscv_vcpu_sbi_system_reset() sets KVM_EXIT_SYSTEM_EVENT, after which a VMM that honors the guest\u0027s request tears down the VM automatically; no person must perform an additional action.\nS:C - The guest-triggered kvm_riscv_vcpu_hrtimer_expired() callback accesses host kernel memory after the host struct kvm_vcpu is freed, crossing the KVM guest-to-host isolation boundary.\nC:H - kvm_riscv_vcpu_hrtimer_expired() reconstructs and uses a freed vCPU, and kvm_riscv_vcpu_set_interrupt()/kvm_vcpu_kick() read reclaimed lock, wait, mode, and CPU state. Reuse of this UAF object can provide host-kernel memory disclosure primitives.\nI:H - kvm_riscv_vcpu_set_interrupt() acquires a raw spinlock and performs two __set_bit() writes through the freed vCPU before kicking it; if the slab object is reclaimed, these operations corrupt the new host object and provide exploitable UAF write primitives.\nA:H - KASAN recorded a four-byte slab-use-after-free write in do_raw_spin_lock after kvm_destroy_vcpus() freed the vCPU. Corrupting or following the reclaimed lock and wakeup state can oops, panic, or hang the host and its VMs."
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    "dateReserved": "2026-09-25T10:25:14.350Z",
    "dateUpdated": "2026-10-24T14:08:56.354Z",
    "state": "PUBLISHED"
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      "product_status:fixed": "1",
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      "source": "Microsoft CSAF VEX",
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      "title": "RISC-V: KVM: Synchronize hrtimer callback during teardown",
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        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRISC-V: KVM: Synchronize hrtimer callback during teardown\n\nThe non-Sstc hrtimer callback clears next_set before its final uses of\nthe enclosing vCPU.  If teardown observes next_set as false while the\ncallback is still running, kvm_riscv_vcpu_timer_cancel() skips\nhrtimer_cancel() and kvm_destroy_vcpus() can free the vCPU before the\ncallback enters kvm_riscv_vcpu_set_interrupt().\n\nA guest can arm the timer with SBI TIME and request shutdown with SBI\nlegacy shutdown or SRST.  A VMM that honors KVM_EXIT_SYSTEM_EVENT and\ndestroys the VM supplies the teardown side of the race; no post-launch\nhost ioctl is needed to arm or request teardown.\n\nOn upstream master 62cc90241548, generic KASAN reported:\n\n  BUG: KASAN: slab-use-after-free in do_raw_spin_lock\n  Write of size 4 at addr ff60000005e58898\n\n  kvm_riscv_vcpu_set_interrupt\n  kvm_riscv_vcpu_hrtimer_expired\n  __hrtimer_run_queues\n  hrtimer_interrupt\n\nThe object was allocated by KVM_CREATE_VCPU and freed concurrently by:\n\n  kvm_destroy_vcpus\n  kvm_arch_destroy_vm\n  kvm_destroy_vm\n  __fput\n\nFor deterministic validation, I added mdelay(1000) immediately after\nthe existing next_set = false assignment.  This only widens the\nexisting post-clear callback window.  A no-delay trace build naturally\nreached the callback-after-teardown-start/before-deinit ordering in 12\nof 200 runs, but 1,500 stock-kernel stress iterations did not produce a\nKASAN report, so natural reproduction is timing-sensitive.\n\nAlways invoke hrtimer_cancel() for an initialized timer.  Preserve the\nexisting -EINVAL result when the timer is no longer set, but only after\nsynchronizing with a running callback.\n\nWith this patch, hrtimer_cancel() blocked for the full widened callback\nwindow before vCPU destruction.  KASAN reported no error in 100\nfixed-and-widened runs or 200 fix-only timing-sweep runs."
          }
        ],
        "id": "CVE-2026-98464",
        "lastModified": "2026-10-24T14:16:42.853",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "LOCAL",
                "availabilityImpact": "HIGH",
                "baseScore": 9.3,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "CHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 2.5,
              "impactScore": 6.0,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ]
        },
        "published": "2026-10-18T16:16:56.873",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2af03b606aadaaeb386658ef798c79bdcdef87c1"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/3cc6184bd5920c9685d87f4e260568feba08650d"
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            "url": "https://git.kernel.org/stable/c/9bdbae64ae0dab93041ebc57ec4e93def793fc2d"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/aaad136d56d91252517272b68cd533e5714698d5"
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          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e66aced74f0122380603c9910a71d77618b28f0e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/ea91f05a55b807ead3166546a2c75f4185ca645f"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-24T14:27:44+00:00",
      "cve": "CVE-2026-98464",
      "id": "CVE-2026-98464",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_not_affected": "278",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: RISC-V: KVM: Synchronize hrtimer callback during teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98464.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-10-19T23:50:23Z",
      "cve": "CVE-2026-98464",
      "id": "CVE-2026-98464",
      "initial_release_date": "2026-10-19T23:50:23Z",
      "product_status:known_affected": "0",
      "product_status:known_not_affected": "348",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98464",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-98464.json",
      "version": "2"
    }
  }
}



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