CVE-2026-93040 (GCVE-0-2026-93040)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-10-19 09:04
VLAI
Title
dmaengine: dw-edma: Serialize channel state checks
Summary
In the Linux kernel, the following vulnerability has been resolved: dmaengine: dw-edma: Serialize channel state checks pause() and resume() read and update channel state without holding vc.lock, while the interrupt handlers update the same state under it. Take the same lock around those state checks so that request, status, and configured stay consistent. For example, pause() can observe EDMA_ST_BUSY right before the interrupt handler completes the final descriptor and moves the channel to EDMA_ST_IDLE, and then record EDMA_REQ_PAUSE on an already idle channel. No further interrupt will acknowledge the request, and since issue_pending() requires EDMA_REQ_NONE, the channel is wedged for good: terminate_all() leaves the stale request behind, so even reconfiguring the channel does not recover it. issue_pending() already runs under vc.lock, but it tests configured before taking it. Move that test under the lock as well, so configured, request, and status are evaluated as one channel-state snapshot.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7034 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < be0072af8ce6e9458cc586e0e8b41a251e7d4316 (git)
Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < 2d76b91deeab973dd8a8c2ee587ce27f881de768 (git)
Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < 3001cfcee30dcc81f8b3774319c12067f126e49a (git)
Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < b6293a8a38f4d5866ce1a264c138265a02e4c53a (git)
Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < da16a02f0998a0d455ce6265b836b29ad92e6e58 (git)
Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < fe0ffa0190e862ed71e8c1a476090f648c9cb7d9 (git)
Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < 6fc436e1500c5e4f0dde2a3dbadf6d898057be8f (git)
Affected: e63d79d1ffcd2201a2dbff1d7a1184b8f3ec74cf , < f7d1619f3e10c619b62c6cd6d95371b5c526c85a (git)
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Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: dw-edma: Serialize channel state checks\n\npause() and resume() read and update channel state without holding vc.lock,\nwhile the interrupt handlers update the same state under it. Take the same\nlock around those state checks so that request, status, and configured stay\nconsistent.\n\nFor example, pause() can observe EDMA_ST_BUSY right before the interrupt\nhandler completes the final descriptor and moves the channel to\nEDMA_ST_IDLE, and then record EDMA_REQ_PAUSE on an already idle channel. No\nfurther interrupt will acknowledge the request, and since issue_pending()\nrequires EDMA_REQ_NONE, the channel is wedged for good: terminate_all()\nleaves the stale request behind, so even reconfiguring the channel does not\nrecover it.\n\nissue_pending() already runs under vc.lock, but it tests configured before\ntaking it. Move that test under the lock as well, so configured, request,\nand status are evaluated as one channel-state snapshot."
        }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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    "state": "PUBLISHED"
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: dw-edma: Serialize channel state checks\n\npause() and resume() read and update channel state without holding vc.lock,\nwhile the interrupt handlers update the same state under it. Take the same\nlock around those state checks so that request, status, and configured stay\nconsistent.\n\nFor example, pause() can observe EDMA_ST_BUSY right before the interrupt\nhandler completes the final descriptor and moves the channel to\nEDMA_ST_IDLE, and then record EDMA_REQ_PAUSE on an already idle channel. No\nfurther interrupt will acknowledge the request, and since issue_pending()\nrequires EDMA_REQ_NONE, the channel is wedged for good: terminate_all()\nleaves the stale request behind, so even reconfiguring the channel does not\nrecover it.\n\nissue_pending() already runs under vc.lock, but it tests configured before\ntaking it. Move that test under the lock as well, so configured, request,\nand status are evaluated as one channel-state snapshot."
          }
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
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      "current_release_date": "2026-10-20T11:40:12+00:00",
      "cve": "CVE-2026-93040",
      "id": "CVE-2026-93040",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_not_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: dmaengine: dw-edma: Serialize channel state checks",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-93040.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-20T00:30:29Z",
      "cve": "CVE-2026-93040",
      "id": "CVE-2026-93040",
      "initial_release_date": "2026-09-18T00:13:05Z",
      "product_status:known_affected": "176",
      "product_status:known_not_affected": "172",
      "product_status:recommended": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93040",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-93040.json",
      "version": "5"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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