{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-68222", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-30T09:28:09.375Z", "datePublished": "2026-08-10T12:00:42.687Z", "dateUpdated": "2026-08-19T16:31:51.745Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:31:51.745Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: msi2500: Return queued buffers on start_streaming() failure\n\nThe vb2 framework hands buffers to the driver via buf_queue() before\ncalling start_streaming(). If start_streaming() returns an error\nwithout first returning those buffers via vb2_buffer_done(),\nvb2_start_streaming() fires WARN_ON(owned_by_drv_count) and the queued\nbuffers leak.\n\nmsi2500_start_streaming() had five error paths that all hit this trap\nand were further tangled by ret-overwriting between calls:\n\n - -ENODEV when the USB device was already disconnected\n - -ERESTARTSYS when mutex_lock_interruptible() was interrupted\n - msi2500_set_usb_adc() failure: ret was silently overwritten by\n the next call (msi2500_isoc_init), so the error was lost entirely\n - msi2500_isoc_init() failure: cleanup_queued_bufs was called, but\n the function then fell through to msi2500_ctrl_msg() and again\n masked the original error by overwriting ret\n - msi2500_ctrl_msg(CMD_START_STREAMING) failure: no cleanup at all,\n leaving isoc URBs submitted with no way for the driver to consume\n them\n\nConsolidate the error paths into a small goto chain. Every failure\nnow stops the function, drains the queued-buffer list, and returns\nthe real error code. The ctrl_msg failure path also rolls back the\npreceding msi2500_isoc_init() via msi2500_isoc_cleanup() before\nunlocking and draining.\n\nThe cleanup helper takes a vb2_buffer_state argument so that the\nstart_streaming error paths can pass VB2_BUF_STATE_QUEUED (as\nexpected by userspace on start_streaming failure) while stop_streaming\nkeeps its existing VB2_BUF_STATE_ERROR semantics.\n\nThis mirrors the uvcvideo fix in commit 4cf3b6fd54eb (\"media: uvcvideo:\nReturn queued buffers on start_streaming() failure\")." } ], "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 vulnerable code is reached only through a local VIDIOC_STREAMON ioctl on the msi2500 SDR character device /dev/swradioN; no network or remote input is involved, and the failure paths are driven from a local process's syscalls.\nAC:L - The attacker controls both sides of the trigger: hold dev->v4l2_lock from a second thread and send a signal to the STREAMON thread so mutex_lock_interruptible() returns -ERESTARTSYS, hitting the leaking error path deterministically and repeatably.\nPR:L - Only an unprivileged local user with access to the V4L2/SDR device node is needed; on desktop, Android and embedded systems these nodes are granted to the logged-in seat or a device group, and no capability check guards STREAMON.\nUI:N - The whole sequence (REQBUFS, QBUF, STREAMON, signal, repeat) is performed by the attacker's own process; no victim action such as plugging in hardware or opening a file is required.\nS:U - The corruption is confined to kernel memory managed by the same kernel security authority; no VM, IOMMU or sandbox boundary is crossed.\nC:H - Buffers left on dev->queued_bufs after the vb2 core reclaims and later frees them become dangling pointers reused by cleanup_queued_bufs()/get_next_fill_buf(), giving a use-after-free that can be groomed to read reclaimed kernel heap contents back into userspace buffers.\nI:H - The stale list entries permit list_add_tail() on an already-linked node (list corruption) and vb2_buffer_done()/isoc-handler writes into freed objects, yielding attacker-influenced kernel heap writes exploitable for control-flow hijacking.\nA:H - At minimum the missing buffer return trips WARN_ON(owned_by_drv_count) (fatal with panic_on_warn) and leaks buffers; the resulting list corruption and use-after-free reliably oops or hang the kernel." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/usb/msi2500/msi2500.c" ], "versions": [ { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "c74b680704baecea4620c0774de473069e0bc4e8", "status": "affected", "versionType": "git" }, { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "2d10eedb786a13f91d76e11320fabb0bf712519f", "status": "affected", "versionType": "git" }, { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "2de14ddb4fea04ca616403a6ba81c5e8099e9b9e", "status": "affected", "versionType": "git" }, { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "1d58229b330b7f67fbfa07e0f2a8a51fbeafaa9a", "status": "affected", "versionType": "git" }, { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "bab9d5a67d4db96ae8c187b92b37979911302a10", "status": "affected", "versionType": "git" }, { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "264b5380c4f8aa92dbc2983ecd2b627f1d5e0061", "status": "affected", "versionType": "git" }, { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "3673cb0a5711e910074d69201da9e1535c03f97a", "status": "affected", "versionType": "git" }, { "version": "977e444f59ad16eedf66acae4f357011c74da291", "lessThan": "7201c17786a498497bca57752883b90914d405ac", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/usb/msi2500/msi2500.c" ], "versions": [ { "version": "3.12", "status": "affected" }, { "version": "0", "lessThan": "3.12", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.6", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "3.12", "versionEndExcluding": "5.10.265" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "5.15.216" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.1.183" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.6.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.12.101" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "7.1.6" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.12", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/c74b680704baecea4620c0774de473069e0bc4e8" }, { "url": "https://git.kernel.org/stable/c/2d10eedb786a13f91d76e11320fabb0bf712519f" }, { "url": "https://git.kernel.org/stable/c/2de14ddb4fea04ca616403a6ba81c5e8099e9b9e" }, { "url": "https://git.kernel.org/stable/c/1d58229b330b7f67fbfa07e0f2a8a51fbeafaa9a" }, { "url": "https://git.kernel.org/stable/c/bab9d5a67d4db96ae8c187b92b37979911302a10" }, { "url": "https://git.kernel.org/stable/c/264b5380c4f8aa92dbc2983ecd2b627f1d5e0061" }, { "url": "https://git.kernel.org/stable/c/3673cb0a5711e910074d69201da9e1535c03f97a" }, { "url": "https://git.kernel.org/stable/c/7201c17786a498497bca57752883b90914d405ac" } ], "title": "media: msi2500: Return queued buffers on start_streaming() failure", "x_generator": { "engine": "bippy-1.2.0" } } } }