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GHSA-487Q-3FXV-JWRM

Vulnerability from github – Published: 2026-08-22 18:30 – Updated: 2026-08-25 06:31

Details

In the Linux kernel, the following vulnerability has been resolved:

misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.

Take fl->lock around the move, matching every other fl->mmaps accessor.

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74646"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-22T16:16:37Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmisc: fastrpc: take fl-\u003elock when moving mmaps on interrupted invoke\n\nWhen an invoke is interrupted by a signal,\nwait_for_completion_interruptible() returns -ERESTARTSYS and\nfastrpc_internal_invoke() moves every buffer from fl-\u003emmaps onto\ncctx-\u003einvoke_interrupted_mmaps. This list_del()/list_add_tail() walk\nruns without holding fl-\u003elock, the lock that serialises fl-\u003emmaps in\nfastrpc_req_mmap() and fastrpc_req_munmap() everywhere else.\n\nTake fl-\u003elock around the move, matching every other fl-\u003emmaps accessor.",
  "id": "GHSA-487q-3fxv-jwrm",
  "modified": "2026-08-25T06:31:25Z",
  "published": "2026-08-22T18:30:27Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74646"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3f265e405e5ef85030c3777262e18bb556bc8724"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a902fe1f80f58a2335b6be1131866f827ec44d1a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/af6345159abcbaa550518f31990d2a9558c2d369"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b85a0e91d7d6cd06a53c881a46f749cfcef416a2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/efd02f8d1a7449f15809bc18d3cd41aafea75d7e"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74646 (GCVE-0-2026-74646)

Vulnerability from cvelistv5 – Published: 2026-08-22 15:32 – Updated: 2026-08-25 05:41

Title

misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke

Summary

In the Linux kernel, the following vulnerability has been resolved: misc: fastrpc: take fl->lock when moving mmaps on interrupted invoke When an invoke is interrupted by a signal, wait_for_completion_interruptible() returns -ERESTARTSYS and fastrpc_internal_invoke() moves every buffer from fl->mmaps onto cctx->invoke_interrupted_mmaps. This list_del()/list_add_tail() walk runs without holding fl->lock, the lock that serialises fl->mmaps in fastrpc_req_mmap() and fastrpc_req_munmap() everywhere else. Take fl->lock around the move, matching every other fl->mmaps accessor.

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 mitre root

References

5 references

URL	Tags
https://git.kernel.org/stable/c/3f265e405e5ef8503…
https://git.kernel.org/stable/c/a902fe1f80f58a233…
https://git.kernel.org/stable/c/af6345159abcbaa55…
https://git.kernel.org/stable/c/efd02f8d1a7449f15…
https://git.kernel.org/stable/c/b85a0e91d7d6cd06a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 76e8e4ace1ed2c97dba3b1370e0e105e07c572bc , < 3f265e405e5ef85030c3777262e18bb556bc8724 (git) Affected: 76e8e4ace1ed2c97dba3b1370e0e105e07c572bc , < a902fe1f80f58a2335b6be1131866f827ec44d1a (git) Affected: 76e8e4ace1ed2c97dba3b1370e0e105e07c572bc , < af6345159abcbaa550518f31990d2a9558c2d369 (git) Affected: 76e8e4ace1ed2c97dba3b1370e0e105e07c572bc , < efd02f8d1a7449f15809bc18d3cd41aafea75d7e (git) Affected: 76e8e4ace1ed2c97dba3b1370e0e105e07c572bc , < b85a0e91d7d6cd06a53c881a46f749cfcef416a2 (git)
Linux	Linux	Affected: 6.2 Unaffected: 0 , < 6.2 (semver) Unaffected: 6.6.152 , ≤ 6.6.* (semver) Unaffected: 6.12.104 , ≤ 6.12.* (semver) Unaffected: 6.18.45 , ≤ 6.18.* (semver) Unaffected: 7.1.9 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/misc/fastrpc.c"
          ],
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          "vendor": "Linux",
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            {
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              "versionType": "git"
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              "versionType": "git"
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            },
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              "version": "0",
              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.12.104",
              "versionType": "semver"
            },
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              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.45",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "7.1.9",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
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      "cpeApplicability": [
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          "nodes": [
            {
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              "value": "AV:L - Reachable only through local ioctl on the Qualcomm FastRPC miscdevice (/dev/fastrpc-*); communication with the DSP is internal rpmsg/glink IPC on the SoC, not via network or adjacent wireless protocols.\nAC:L - Attacker controls both sides: one thread blocks in FASTRPC_IOCTL_INVOKE, delivers a signal to force -ERESTARTSYS, and another thread issues concurrent FASTRPC_IOCTL_MMAP/MUNMAP on the same fd; the race can be retried until it wins.\nPR:L - fastrpc_device_ioctl has no capability check; on Qualcomm/Android deployments non-root processes with FastRPC device access (HALs, system services, or unsigned-PD offload clients) can open the node and hit the vulnerable path without real root.\nUI:N - No victim interaction is required beyond the attacker\u0027s own local access; exploitation uses attacker-controlled threads and signals to race ioctls on an already-open FastRPC file descriptor.\nS:U - The bug corrupts kernel linked-list/heap state in the host OS FastRPC driver; impact is local kernel privilege escalation within the same security authority, not a VM escape or IOMMU boundary bypass.\nC:H - Unsynchronized list_del/list_add_tail on fl-\u003emmaps corrupts kernel list pointers and can orphan or double-reference fastrpc_buf objects, enabling use-after-free and kernel memory disclosure primitives.\nI:H - Corrupting mmap tracking list nodes in kernel heap can yield double-free or use-after-free of fastrpc_buf slabs, which are standard primitives for arbitrary kernel write and control-flow hijacking.\nA:H - List corruption on fl-\u003emmaps reliably causes kernel oops/panic during subsequent mmap/munmap or user teardown; repeated ioctl racing can crash or hang the device."
            }
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        "dateUpdated": "2026-08-25T05:41:04.331Z",
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        "shortName": "Linux"
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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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GHSA-487Q-3FXV-JWRM

CVE-2026-74646 (GCVE-0-2026-74646)

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