CVE-2026-89764

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-89764", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.764Z", "datePublished": "2026-09-11T19:47:05.092Z", "dateUpdated": "2026-10-19T08:52:17.882Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:52:17.882Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust: devres: fix race between concurrent revokers\n\nThere is a potential race condition when two paths try to revoke a\nDevres concurrently.\n\nThe driver core's devres_release_all() calls Revocable::revoke() via the\nrelease callback, while Devres::drop() calls revoke_nosync() on another\nCPU.\n\nThe revoker that does not claim the is_available swap returns\nimmediately, but the revoker that did may still be executing\ndrop_in_place() on the inner data. This can cause a use-after-free when\nthe other revoker's caller proceeds to drop adjacent resources that\ndrop_in_place() still references (e.g., Devres<DmaMappedSgt> racing with\nSGTable freeing the backing sg_table and pages).\n\nFix this by adding a Completion. The release callback signals the\nCompletion after revoke() finishes, and Devres::drop() waits for it when\nit loses the is_available swap. This ensures the wrapped object is fully\ntorn down before Devres::drop() returns."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The race is in the Rust Devres teardown path (Devres::drop vs devres_release_all release callback), reached by local driver unbind/rmmod/sysfs unbind or hot-unplug of Rust-using devices (nova-core NVIDIA GPU, TH1520 PWM, PCI/platform samples). It is not reachable from network packets or a remote protocol.\nAC:L - The attacker can drive both sides: one CPU in device_unbind_cleanup()/devres_release_all() calling Revocable::revoke() (which sleeps in synchronize_rcu(), widening the window), and another dropping the Devres-containing object (SGTable, Arc<irq::Registration>, PWM Chip data). That is an attacker-controlled race, not an uncontrolled layout condition.\nPR:L - Unbind/rmmod is privileged, but per driver-removal UAF scoring an unprivileged local user with the device (DRM render node, PWM sysfs on TH1520 boards, IRQ-generating I/O) can hold/drop Devres-backed objects or keep the other CPU in teardown while the device is unbound. This does not require init-namespace root or a user-namespace capability.\nUI:N - Exploitation does not need a separate victim action such as opening a file or clicking UI. The attacker performs device I/O or holds extra refs themselves while routine unbind, module unload, or hot-unplug runs.\nS:U - Impact is kernel memory corruption and privilege escalation on the same host. It does not cross a VM, IOMMU, or other distinct security-authority boundary.\nC:H - The bug is a use-after-free: the losing revoker returns while drop_in_place() still uses inner data (e.g. dma_unmap_sgtable on SGTable pages, free_irq cookie, IoMem). UAF of those objects yields an arbitrary kernel read primitive.\nI:H - The same UAF of sg_table/pages, IRQ Registration handler state, or MMIO mappings is heap corruption exploitable for writes and control-flow hijack, not a bounded or integrity-neutral fault.\nA:H - Use-after-free of DMA mappings, IRQ registrations, or iomem during unbind can oops/panic the kernel even if not fully exploited, so availability impact is complete."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["rust/kernel/devres.rs"], "versions": [{"version": "05aa6fb1c21d7fb9df735da24096d793223789d5", "lessThan": "e7930d857cc7930fc39b487ea9f3a453eca3713e", "status": "affected", "versionType": "git"}, {"version": "05aa6fb1c21d7fb9df735da24096d793223789d5", "lessThan": "c7e3d57c705ab1053a6a1bbef96795e792da1540", "status": "affected", "versionType": "git"}, {"version": "05aa6fb1c21d7fb9df735da24096d793223789d5", "lessThan": "acc516dfa1972d31836b50abc0115216cd0fccc5", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["rust/kernel/devres.rs"], "versions": [{"version": "6.18", "status": "affected"}, {"version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.56", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "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": "6.18", "versionEndExcluding": "6.18.56"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.2.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/e7930d857cc7930fc39b487ea9f3a453eca3713e"}, {"url": "https://git.kernel.org/stable/c/c7e3d57c705ab1053a6a1bbef96795e792da1540"}, {"url": "https://git.kernel.org/stable/c/acc516dfa1972d31836b50abc0115216cd0fccc5"}], "title": "rust: devres: fix race between concurrent revokers", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["rust/kernel/devres.rs"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "e7930d857cc7930fc39b487ea9f3a453eca3713e", "status": "affected", "version": "05aa6fb1c21d7fb9df735da24096d793223789d5", "versionType": "git"}, {"lessThan": "c7e3d57c705ab1053a6a1bbef96795e792da1540", "status": "affected", "version": "05aa6fb1c21d7fb9df735da24096d793223789d5", "versionType": "git"}, {"lessThan": "acc516dfa1972d31836b50abc0115216cd0fccc5", "status": "affected", "version": "05aa6fb1c21d7fb9df735da24096d793223789d5", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["rust/kernel/devres.rs"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.18"}, {"lessThan": "6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrust: devres: fix race between concurrent revokers\n\nThere is a potential race condition when two paths try to revoke a\nDevres concurrently.\n\nThe driver core's devres_release_all() calls Revocable::revoke() via the\nrelease callback, while Devres::drop() calls revoke_nosync() on another\nCPU.\n\nThe revoker that does not claim the is_available swap returns\nimmediately, but the revoker that did may still be executing\ndrop_in_place() on the inner data. This can cause a use-after-free when\nthe other revoker's caller proceeds to drop adjacent resources that\ndrop_in_place() still references (e.g., Devres<DmaMappedSgt> racing with\nSGTable freeing the backing sg_table and pages).\n\nFix this by adding a Completion. The release callback signals the\nCompletion after revoke() finishes, and Devres::drop() waits for it when\nit loses the is_available swap. This ensures the wrapped object is fully\ntorn down before Devres::drop() returns."}], "id": "CVE-2026-89764", "lastModified": "2026-10-19T09:18:19.613", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-11T20:20:07.637", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/acc516dfa1972d31836b50abc0115216cd0fccc5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c7e3d57c705ab1053a6a1bbef96795e792da1540"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e7930d857cc7930fc39b487ea9f3a453eca3713e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: Linux kernel (rust devres): Use-after-free due to race condition in concurrent resource revocation", "id": "2532452", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2532452"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's `rust: devres` component. A race condition exists when two processes attempt to revoke a `Devres` resource concurrently. This can lead to a use-after-free vulnerability, where one process might free resources that another process is still actively using. Such an issue could result in system instability or unexpected behavior."], "name": "CVE-2026-89764", "public_date": "2026-09-11T19:47:05Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-89764\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-89764\nhttps://git.kernel.org/stable/c/acc516dfa1972d31836b50abc0115216cd0fccc5\nhttps://git.kernel.org/stable/c/c7e3d57c705ab1053a6a1bbef96795e792da1540"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[05aa6fb1c21d7fb9df735da24096d793223789d5,c7e3d57c705ab1053a6a1bbef96795e792da1540)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[05aa6fb1c21d7fb9df735da24096d793223789d5,acc516dfa1972d31836b50abc0115216cd0fccc5)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.18"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.18)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.4,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-12T08:00:11.012821+00:00", "updated": "2026-09-15T19:15:16.157167+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}