CVE-2026-68370 (GCVE-0-2026-68370)

Vulnerability from cvelistv5 – Published: 2026-08-10 12:03 – Updated: 2026-08-19 16:34
VLAI
Title
usb: gadget: dummy_hcd: prevent fifo_req reuse during giveback
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: dummy_hcd: prevent fifo_req reuse during giveback dummy_hcd embeds a single shared usb_request (dum->fifo_req) that the "emulated single-request FIFO" fast-path in dummy_queue() reuses for small IN transfers: it copies the caller's request into it (req->req = *_req) and queues it, treating list_empty(&fifo_req.queue) as "the slot is free". The completion side (dummy_timer/transfer/nuke/dummy_dequeue) follows the standard pattern: list_del_init(&req->queue) unlinks the request, then the lock is dropped and usb_gadget_giveback_request() invokes req->complete(). But list_del_init() makes fifo_req.queue look empty *before* the completion callback returns, so a concurrent dummy_queue() on another CPU sees the slot as free, reuses fifo_req and runs req->req = *_req -- overwriting req->complete while dummy_timer is mid-calling it. The indirect call then jumps to a clobbered pointer, causing a general protection fault / page fault in dummy_timer (syzkaller extid faf3a6cf579fc65591ca). The clobbering write is an in-bounds memcpy on a live shared object, so KASAN cannot flag it. Add a fifo_req_busy bit covering the shared request's whole lifetime: set it in dummy_queue() when the FIFO fast-path takes fifo_req (making it the fast-path guard, replacing the list_empty(&fifo_req.queue) test), and clear it after the completion callback has returned, via a dummy_giveback() helper used at all four gadget-request giveback sites. The shared slot can no longer be reused until its completion callback has finished.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 16a685172abc9233728830e27d26ffa778975b51 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 95f30a21612cc65761c58ba044b1767699437317 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3cab0e5498d0fbb21fe1a9181f7bda9a844a697e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e2b2740f1242bc70b5b46da2cdbbaa419f490e59 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 67b589d09a96882d56842dced5698ed8dd06ce45 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e239ea91b48180ed48a86ac25643832a02c88456 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e24b33618231034bf01dfaff4fd3409d4b4d5b2e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d5e5cd3654d2b5359a12ea6586120f05b28634ee (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.6 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: dummy_hcd: prevent fifo_req reuse during giveback\n\ndummy_hcd embeds a single shared usb_request (dum-\u003efifo_req) that the\n\"emulated single-request FIFO\" fast-path in dummy_queue() reuses for\nsmall IN transfers: it copies the caller\u0027s request into it\n(req-\u003ereq = *_req) and queues it, treating list_empty(\u0026fifo_req.queue)\nas \"the slot is free\".\n\nThe completion side (dummy_timer/transfer/nuke/dummy_dequeue) follows\nthe standard pattern: list_del_init(\u0026req-\u003equeue) unlinks the request,\nthen the lock is dropped and usb_gadget_giveback_request() invokes\nreq-\u003ecomplete().  But list_del_init() makes fifo_req.queue look empty\n*before* the completion callback returns, so a concurrent dummy_queue()\non another CPU sees the slot as free, reuses fifo_req and runs\nreq-\u003ereq = *_req -- overwriting req-\u003ecomplete while dummy_timer is\nmid-calling it.  The indirect call then jumps to a clobbered pointer,\ncausing a general protection fault / page fault in dummy_timer\n(syzkaller extid faf3a6cf579fc65591ca).  The clobbering write is an\nin-bounds memcpy on a live shared object, so KASAN cannot flag it.\n\nAdd a fifo_req_busy bit covering the shared request\u0027s whole lifetime:\nset it in dummy_queue() when the FIFO fast-path takes fifo_req (making\nit the fast-path guard, replacing the list_empty(\u0026fifo_req.queue)\ntest), and clear it after the completion callback has returned, via a\ndummy_giveback() helper used at all four gadget-request giveback\nsites.  The shared slot can no longer be reused until its completion\ncallback has finished."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
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            {
              "lang": "en",
              "value": "AV:L - dummy_hcd is a purely virtual UDC/HCD pair with no physical port; both sides of the race are driven locally \u2014 gadget-side `usb_ep_queue()` via raw-gadget ioctls, gadgetfs/functionfs endpoint writes or configfs function traffic, and the host side by the in-software `dummy_timer`/URB path. No cable, hardware, or network access is involved, matching the AV:L used for other dummy_hcd/gadget bugs.\nAC:L - The attacker controls both sides of the race: it queues small IN requests on one CPU in a tight loop while the periodic 1 ms `dummy_timer` frame processing performs giveback on another, and the fast-path guard (`list_empty(\u0026fifo_req.queue)`) is cleared before the callback returns, so the window is entered on essentially every iteration and can be retried indefinitely.\nPR:L - No capability check exists anywhere on the path \u2014 `dummy_queue()` and the giveback sites perform none; reachability is gated only by node/mount permissions on /dev/raw-gadget, gadgetfs or the gadget configfs/functionfs tree, which on Android and embedded/industrial systems are routinely delegated to non-root system accounts, so basic local access suffices.\nUI:N - The attacker performs every step itself \u2014 enabling the gadget, queueing the IN transfers, and letting the emulated frame timer run \u2014 with no action required from any other user or victim.\nS:U - The corrupted object and the resulting control-flow hijack are entirely within the kernel\u0027s own security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The in-flight copy overwrites `fifo_req.req.buf`, `length`, `actual` and `context` of the live shared request, so the completion path and the host-side `transfer()` memcpy operate with mismatched buffer/length/context pairs, letting an attacker steer reads out of unintended kernel memory and surface them through the emulated host transfer \u2014 a kernel memory disclosure primitive.\nI:H - `req-\u003ereq = *_req` clobbers the `complete` function pointer while `usb_gadget_giveback_request()` is dereferencing it, giving a torn/stale indirect call plus a `context` mismatch (type confusion) that is a direct control-flow hijack primitive; the same race also lets the shared `fifo_buf` be written under a stale length, yielding controllable kernel writes.\nA:H - The reported effect is a general protection fault / kernel page fault in `dummy_timer` (syzbot faf3a6cf579fc65591ca) from calling through the clobbered pointer, i.e. a kernel oops that an unprivileged local attacker can trigger repeatedly."
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        "dateUpdated": "2026-08-19T16:34:31.156Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/16a685172abc9233728830e27d26ffa778975b51"
        },
        {
          "url": "https://git.kernel.org/stable/c/95f30a21612cc65761c58ba044b1767699437317"
        },
        {
          "url": "https://git.kernel.org/stable/c/3cab0e5498d0fbb21fe1a9181f7bda9a844a697e"
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          "url": "https://git.kernel.org/stable/c/e2b2740f1242bc70b5b46da2cdbbaa419f490e59"
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      "title": "usb: gadget: dummy_hcd: prevent fifo_req reuse during giveback",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-68370",
    "datePublished": "2026-08-10T12:03:48.320Z",
    "dateReserved": "2026-07-30T09:28:09.386Z",
    "dateUpdated": "2026-08-19T16:34:31.156Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-68370",
      "date": "2026-08-20",
      "epss": "0.00138",
      "percentile": "0.03712"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2026-68370\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-10T13:20:29.790\",\"lastModified\":\"2026-08-19T17:20:46.603\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nusb: gadget: dummy_hcd: prevent fifo_req reuse during giveback\\n\\ndummy_hcd embeds a single shared usb_request (dum-\u003efifo_req) that the\\n\\\"emulated single-request FIFO\\\" fast-path in dummy_queue() reuses for\\nsmall IN transfers: it copies the caller\u0027s request into it\\n(req-\u003ereq = *_req) and queues it, treating list_empty(\u0026fifo_req.queue)\\nas \\\"the slot is free\\\".\\n\\nThe completion side (dummy_timer/transfer/nuke/dummy_dequeue) follows\\nthe standard pattern: list_del_init(\u0026req-\u003equeue) unlinks the request,\\nthen the lock is dropped and usb_gadget_giveback_request() invokes\\nreq-\u003ecomplete().  But list_del_init() makes fifo_req.queue look empty\\n*before* the completion callback returns, so a concurrent dummy_queue()\\non another CPU sees the slot as free, reuses fifo_req and runs\\nreq-\u003ereq = *_req -- overwriting req-\u003ecomplete while dummy_timer is\\nmid-calling it.  The indirect call then jumps to a clobbered pointer,\\ncausing a general protection fault / page fault in dummy_timer\\n(syzkaller extid faf3a6cf579fc65591ca).  The clobbering write is an\\nin-bounds memcpy on a live shared object, so KASAN cannot flag it.\\n\\nAdd a fifo_req_busy bit covering the shared request\u0027s whole lifetime:\\nset it in dummy_queue() when the FIFO fast-path takes fifo_req (making\\nit the fast-path guard, replacing the list_empty(\u0026fifo_req.queue)\\ntest), and clear it after the completion callback has returned, via a\\ndummy_giveback() helper used at all four gadget-request giveback\\nsites.  The shared slot can no longer be reused until its completion\\ncallback has finished.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/usb/gadget/udc/dummy_hcd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"16a685172abc9233728830e27d26ffa778975b51\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"95f30a21612cc65761c58ba044b1767699437317\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"3cab0e5498d0fbb21fe1a9181f7bda9a844a697e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e2b2740f1242bc70b5b46da2cdbbaa419f490e59\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"67b589d09a96882d56842dced5698ed8dd06ce45\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e239ea91b48180ed48a86ac25643832a02c88456\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"e24b33618231034bf01dfaff4fd3409d4b4d5b2e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1da177e4c3f41524e886b7f1b8a0c1fc7321cac2\",\"lessThan\":\"d5e5cd3654d2b5359a12ea6586120f05b28634ee\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/usb/gadget/udc/dummy_hcd.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.12\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.12\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.6\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/16a685172abc9233728830e27d26ffa778975b51\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3cab0e5498d0fbb21fe1a9181f7bda9a844a697e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/67b589d09a96882d56842dced5698ed8dd06ce45\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/95f30a21612cc65761c58ba044b1767699437317\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5e5cd3654d2b5359a12ea6586120f05b28634ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e239ea91b48180ed48a86ac25643832a02c88456\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e24b33618231034bf01dfaff4fd3409d4b4d5b2e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e2b2740f1242bc70b5b46da2cdbbaa419f490e59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "None",
      "current_release_date": "2026-08-11T13:30:07+00:00",
      "cve": "CVE-2026-68370",
      "id": "CVE-2026-68370",
      "initial_release_date": "2026-08-10T00:00:00+00:00",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: usb: gadget: dummy_hcd: prevent fifo_req reuse during giveback",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-68370.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.