{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72489", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.936Z", "datePublished": "2026-08-15T05:57:24.948Z", "dateUpdated": "2026-08-17T05:44:51.131Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:44:51.131Z" }, "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 'used' atomic flag. Immediately after this, the code\naccesses nvec->rx->data[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->rx->data[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": { "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" }, "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->rx->data[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->rx->data[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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/nvec/nvec.c" ], "versions": [ { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "6b2ea886ebdae44a2394029844a4e78f58e1587d", "status": "affected", "versionType": "git" }, { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "a37625c7b688fcf68a54263528eccbabfd7fa17a", "status": "affected", "versionType": "git" }, { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "9f7fe4165a1f1014bdadc8e744c0fd3c2d8c0b89", "status": "affected", "versionType": "git" }, { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "08626fcfe12308ca3f8b22c538ba7dee0b2dce7a", "status": "affected", "versionType": "git" }, { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "f19a5bc059051143c489dd6f79a0f9c3bfd13aea", "status": "affected", "versionType": "git" }, { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "bb3d592c7d6c4ec8ac6640c690ca13298e7e8e90", "status": "affected", "versionType": "git" }, { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "5de04caa46b635e180cecbd164e333eca535db94", "status": "affected", "versionType": "git" }, { "version": "d6bdcf2e1019351cbc176e963b7756766bdd8721", "lessThan": "26813881181deb3a32fbb59eadb2599cbe8423f6", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/staging/nvec/nvec.c" ], "versions": [ { "version": "3.2", "status": "affected" }, { "version": "0", "lessThan": "3.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.10.261" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "5.15.212" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.1.178" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.2", "versionEndExcluding": "7.2" } ] } ] } ], "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" } } } }