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CVE-2026-72489 (GCVE-0-2026-72489)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:57 – Updated: 2026-08-17 05:44
VLAI
Title
staging: nvec: fix use-after-free in nvec_rx_completed()
Summary
In the Linux kernel, the following vulnerability has been resolved: staging: nvec: fix use-after-free in nvec_rx_completed() In nvec_rx_completed(), when an incomplete RX transfer is detected, nvec_msg_free() is called to return the message back to the pool by clearing its 'used' atomic flag. Immediately after this, the code accesses nvec->rx->data[0] to check the message type. Since nvec_msg_free() marks the pool slot as available via atomic_set(), any concurrent or subsequent call to nvec_msg_alloc() could claim that same slot and overwrite its data[] array. Reading nvec->rx->data[0] after freeing the message is therefore a use-after-free. Fix this by saving the message type byte before calling nvec_msg_free(), then using the saved value for the battery quirk check.
Severity
8.4 (High)
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < 6b2ea886ebdae44a2394029844a4e78f58e1587d (git)
Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < a37625c7b688fcf68a54263528eccbabfd7fa17a (git)
Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < 9f7fe4165a1f1014bdadc8e744c0fd3c2d8c0b89 (git)
Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < 08626fcfe12308ca3f8b22c538ba7dee0b2dce7a (git)
Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < f19a5bc059051143c489dd6f79a0f9c3bfd13aea (git)
Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < bb3d592c7d6c4ec8ac6640c690ca13298e7e8e90 (git)
Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < 5de04caa46b635e180cecbd164e333eca535db94 (git)
Affected: d6bdcf2e1019351cbc176e963b7756766bdd8721 , < 26813881181deb3a32fbb59eadb2599cbe8423f6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.2
Unaffected: 0 , < 3.2 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: nvec: fix use-after-free in nvec_rx_completed()\n\nIn nvec_rx_completed(), when an incomplete RX transfer is detected,\nnvec_msg_free() is called to return the message back to the pool by\nclearing its \u0027used\u0027 atomic flag. Immediately after this, the code\naccesses nvec-\u003erx-\u003edata[0] to check the message type.\n\nSince nvec_msg_free() marks the pool slot as available via atomic_set(),\nany concurrent or subsequent call to nvec_msg_alloc() could claim that\nsame slot and overwrite its data[] array. Reading nvec-\u003erx-\u003edata[0] after\nfreeing the message is therefore a use-after-free.\n\nFix this by saving the message type byte before calling nvec_msg_free(),\nthen using the saved value for the battery quirk check."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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              "value": "AV:L - The flaw is hit in the I2C slave IRQ handler when the embedded controller ends an RX transfer early; on affected Tegra20 PAZ00 netbooks a local actor can reach it by stressing EC traffic via kernel battery polling and userspace sysfs/input subdrivers (LED, keyboard) that call nvec_write_async().\nAC:L - This is a use-after-free where nvec_msg_free() returns the RX pool slot and the handler immediately re-reads nvec-\u003erx-\u003edata[0]; on SMP an attacker can provoke incomplete NVEC_BAT responses while concurrent I2C IRQs call nvec_msg_alloc(), controlling both sides of the slot-reuse race.\nPR:N - No elevated privileges are needed because the nvec-power delayed worker automatically issues NVEC_BAT requests every five seconds at boot, and documented incomplete EC battery responses can reach the vulnerable IRQ path before any user authentication or special capabilities.\nUI:N - Exploitation does not require victim interaction; kernel background battery and AC polling plus EC-initiated incomplete transfers can invoke nvec_rx_completed() without the user mounting filesystems, opening files, or performing other deliberate actions.\nS:U - Impact is confined to kernel memory and privileges on the same Tegra SoC running the driver; this is not a VM escape, hypervisor breakout, or other cross-security-authority boundary violation.\nC:H - Reading nvec-\u003erx-\u003edata[0] after nvec_msg_free() is a use-after-free on a msg_pool slot where concurrent nvec_msg_alloc() can overwrite data[], yielding attacker-influenced kernel memory reads and potential disclosure of pointers or adjacent structure contents.\nI:H - Use-after-free on reusable nvec_msg pool entries can be leveraged for controlled reuse of freed message buffers, enabling heap-style corruption primitives that may lead to arbitrary kernel memory writes and privilege escalation or code execution.\nA:H - The post-free read can mis-handle ec_transfer completion and corrupt IRQ-time state; use-after-free in hardirq context can kernel oops or panic the system, consistent with the original battery-quirk crash this code path was introduced to mitigate."
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        "dateUpdated": "2026-08-17T05:44:51.131Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-08-09T03:40:39.936Z",
    "dateUpdated": "2026-08-17T05:44:51.131Z",
    "state": "PUBLISHED"
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      "date": "2026-09-05",
      "epss": "0.00148",
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Reading nvec-\u003erx-\u003edata[0] after\\nfreeing the message is therefore a use-after-free.\\n\\nFix this by saving the message type byte before calling nvec_msg_free(),\\nthen using the saved value for the battery quirk check.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/staging/nvec/nvec.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"6b2ea886ebdae44a2394029844a4e78f58e1587d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"a37625c7b688fcf68a54263528eccbabfd7fa17a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"9f7fe4165a1f1014bdadc8e744c0fd3c2d8c0b89\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"08626fcfe12308ca3f8b22c538ba7dee0b2dce7a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"f19a5bc059051143c489dd6f79a0f9c3bfd13aea\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"bb3d592c7d6c4ec8ac6640c690ca13298e7e8e90\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"5de04caa46b635e180cecbd164e333eca535db94\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d6bdcf2e1019351cbc176e963b7756766bdd8721\",\"lessThan\":\"26813881181deb3a32fbb59eadb2599cbe8423f6\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/staging/nvec/nvec.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":8.4,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.5,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/08626fcfe12308ca3f8b22c538ba7dee0b2dce7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26813881181deb3a32fbb59eadb2599cbe8423f6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5de04caa46b635e180cecbd164e333eca535db94\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b2ea886ebdae44a2394029844a4e78f58e1587d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9f7fe4165a1f1014bdadc8e744c0fd3c2d8c0b89\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a37625c7b688fcf68a54263528eccbabfd7fa17a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bb3d592c7d6c4ec8ac6640c690ca13298e7e8e90\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f19a5bc059051143c489dd6f79a0f9c3bfd13aea\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T10:36:51+00:00",
      "cve": "CVE-2026-72489",
      "id": "CVE-2026-72489",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: staging: nvec: fix use-after-free in nvec_rx_completed()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72489.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


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