CVE-2026-72489 (GCVE-0-2026-72489)
Vulnerability from cvelistv5
Published
2026-08-15 05:57
Modified
2026-08-17 05:44
Severity ?
VLAI Severity ?
EPSS score ?
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.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 Version: d6bdcf2e1019351cbc176e963b7756766bdd8721 |
||
{
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"version": "0",
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"status": "unaffected",
"version": "5.15.212",
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{
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"version": "6.1.178",
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{
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"version": "7.1.5",
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{
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"versionType": "original_commit_for_fix"
}
]
}
],
"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\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."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.4,
"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"
},
"scenarios": [
{
"lang": "en",
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:44:51.131Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/6b2ea886ebdae44a2394029844a4e78f58e1587d"
},
{
"url": "https://git.kernel.org/stable/c/a37625c7b688fcf68a54263528eccbabfd7fa17a"
},
{
"url": "https://git.kernel.org/stable/c/9f7fe4165a1f1014bdadc8e744c0fd3c2d8c0b89"
},
{
"url": "https://git.kernel.org/stable/c/08626fcfe12308ca3f8b22c538ba7dee0b2dce7a"
},
{
"url": "https://git.kernel.org/stable/c/f19a5bc059051143c489dd6f79a0f9c3bfd13aea"
},
{
"url": "https://git.kernel.org/stable/c/bb3d592c7d6c4ec8ac6640c690ca13298e7e8e90"
},
{
"url": "https://git.kernel.org/stable/c/5de04caa46b635e180cecbd164e333eca535db94"
},
{
"url": "https://git.kernel.org/stable/c/26813881181deb3a32fbb59eadb2599cbe8423f6"
}
],
"title": "staging: nvec: fix use-after-free in nvec_rx_completed()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72489",
"datePublished": "2026-08-15T05:57:24.948Z",
"dateReserved": "2026-08-09T03:40:39.936Z",
"dateUpdated": "2026-08-17T05:44:51.131Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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