CVE-2026-89764 (GCVE-0-2026-89764)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:47 – Updated: 2026-10-19 08:52
VLAI
Title
rust: devres: fix race between concurrent revokers
Summary
In the Linux kernel, the following vulnerability has been resolved: rust: devres: fix race between concurrent revokers There is a potential race condition when two paths try to revoke a Devres concurrently. The driver core's devres_release_all() calls Revocable::revoke() via the release callback, while Devres::drop() calls revoke_nosync() on another CPU. The revoker that does not claim the is_available swap returns immediately, but the revoker that did may still be executing drop_in_place() on the inner data. This can cause a use-after-free when the other revoker's caller proceeds to drop adjacent resources that drop_in_place() still references (e.g., Devres<DmaMappedSgt> racing with SGTable freeing the backing sg_table and pages). Fix this by adding a Completion. The release callback signals the Completion after revoke() finishes, and Devres::drop() waits for it when it loses the is_available swap. This ensures the wrapped object is fully torn down before Devres::drop() returns.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6643 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 05aa6fb1c21d7fb9df735da24096d793223789d5 , < e7930d857cc7930fc39b487ea9f3a453eca3713e (git)
Affected: 05aa6fb1c21d7fb9df735da24096d793223789d5 , < c7e3d57c705ab1053a6a1bbef96795e792da1540 (git)
Affected: 05aa6fb1c21d7fb9df735da24096d793223789d5 , < acc516dfa1972d31836b50abc0115216cd0fccc5 (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.56 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
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          "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\u0027s 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\u0027s caller proceeds to drop adjacent resources that\ndrop_in_place() still references (e.g., Devres\u003cDmaMappedSgt\u003e 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."
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              "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\u003cirq::Registration\u003e, 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."
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    "datePublished": "2026-09-11T19:47:05.092Z",
    "dateReserved": "2026-09-11T19:38:34.764Z",
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            "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\u0027s 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\u0027s caller proceeds to drop adjacent resources that\ndrop_in_place() still references (e.g., Devres\u003cDmaMappedSgt\u003e 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."
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}



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