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vuln-cve/data/2026/43xxx/CVE-2026-43236.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-43236",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-05-01T14:12:55.995Z",
"datePublished": "2026-05-06T11:28:31.543Z",
"dateUpdated": "2026-08-05T12:26:47.254Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:26:47.254Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/atmel-hlcdc: fix use-after-free of drm_crtc_commit after release\n\nThe atmel_hlcdc_plane_atomic_duplicate_state() callback was copying\nthe atmel_hlcdc_plane state structure without properly duplicating the\ndrm_plane_state. In particular, state->commit remained set to the old\nstate commit, which can lead to a use-after-free in the next\ndrm_atomic_commit() call.\n\nFix this by calling\n__drm_atomic_helper_duplicate_plane_state(), which correctly clones\nthe base drm_plane_state (including the ->commit pointer).\n\nIt has been seen when closing and re-opening the device node while\nanother DRM client (e.g. fbdev) is still attached:\n\n=============================================================================\nBUG kmalloc-64 (Not tainted): Poison overwritten\n-----------------------------------------------------------------------------\n\n0xc611b344-0xc611b344 @offset=836. First byte 0x6a instead of 0x6b\nFIX kmalloc-64: Restoring Poison 0xc611b344-0xc611b344=0x6b\nAllocated in drm_atomic_helper_setup_commit+0x1e8/0x7bc age=178 cpu=0\npid=29\n drm_atomic_helper_setup_commit+0x1e8/0x7bc\n drm_atomic_helper_commit+0x3c/0x15c\n drm_atomic_commit+0xc0/0xf4\n drm_framebuffer_remove+0x4cc/0x5a8\n drm_mode_rmfb_work_fn+0x6c/0x80\n process_one_work+0x12c/0x2cc\n worker_thread+0x2a8/0x400\n kthread+0xc0/0xdc\n ret_from_fork+0x14/0x28\nFreed in drm_atomic_helper_commit_hw_done+0x100/0x150 age=8 cpu=0\npid=169\n drm_atomic_helper_commit_hw_done+0x100/0x150\n drm_atomic_helper_commit_tail+0x64/0x8c\n commit_tail+0x168/0x18c\n drm_atomic_helper_commit+0x138/0x15c\n drm_atomic_commit+0xc0/0xf4\n drm_atomic_helper_set_config+0x84/0xb8\n drm_mode_setcrtc+0x32c/0x810\n drm_ioctl+0x20c/0x488\n sys_ioctl+0x14c/0xc20\n ret_fast_syscall+0x0/0x54\nSlab 0xef8bc360 objects=21 used=16 fp=0xc611b7c0\nflags=0x200(workingset|zone=0)\nObject 0xc611b340 @offset=832 fp=0xc611b7c0"
}
],
"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 atmel-hlcdc DRM driver is reached through local DRM/KMS device-node operations such as SETCRTC, atomic commits, framebuffer removal, and close/reopen cleanup. There is no network, adjacent-radio, or physical-device parsing path to this code.\nAC:L - The trigger is a repeatable local sequence that duplicates plane state with a stale commit pointer and then runs another atomic commit; it does not require winning an attacker-uncontrolled race. Closing/reopening while another DRM client such as fbdev is attached is a normal and reasonable display-device condition.\nPR:L - The relevant KMS modeset paths require DRM master, but an unprivileged local seat/display user can obtain or be delegated a DRM primary-node master fd without real root. Framebuffer removal and file-close cleanup paths are ordinary local file operations after that setup.\nUI:N - The attacker can trigger the needed DRM ioctls and file lifecycle operations directly from their own process. No separate victim action is required.\nS:U - The bug corrupts kernel DRM state within the same host kernel security authority. It is not a VM escape, IOMMU bypass, or cross-scope hardware isolation break.\nC:H - This is a kernel use-after-free of a kmalloc-backed drm_crtc_commit object, with stale references later used by DRM atomic commit handling. Such freed-object reuse can plausibly be shaped into kernel memory disclosure, so confidentiality impact is High.\nI:H - The stale commit pointer can lead to writes/refcount/completion operations on freed and potentially reallocated kernel heap memory. As a kernel UAF with plausible heap spraying and control-flow or data corruption potential, integrity impact is High.\nA:H - The reported failure already shows slab poison corruption after the freed commit object is reused, and repeated triggering can crash or destabilize the kernel. Kernel oops/panic-level denial of service makes availability impact High."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c"
],
"versions": [
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "fd4a4d0711f48a99b25bcd45e00eef8339eff82d",
"status": "affected",
"versionType": "git"
},
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "6404898af86d986db1dbbe06177c143e40652e49",
"status": "affected",
"versionType": "git"
},
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "796e77c14c4c1e2cd36473760fb6cc66c695eb47",
"status": "affected",
"versionType": "git"
},
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "ac2d898da5095d46bd1ff8585fdd753d58ad91e7",
"status": "affected",
"versionType": "git"
},
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "a205740a7231e967ac77cb731171642901c327af",
"status": "affected",
"versionType": "git"
},
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "7b4d0fab3ff2c00c6d34e1952c9df5129a826aee",
"status": "affected",
"versionType": "git"
},
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "549c6db503dbb85dbff4840830971853feac6625",
"status": "affected",
"versionType": "git"
},
{
"version": "2389fc1305fc1e2cf8b310a75463fefd3058bf48",
"lessThan": "bc847787233277a337788568e90a6ee1557595eb",
"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/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c"
],
"versions": [
{
"version": "4.1",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.1",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.252",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.202",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.165",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.128",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.75",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.16",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19.6",
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0",
"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": "4.1",
"versionEndExcluding": "5.10.252"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.1",
"versionEndExcluding": "5.15.202"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.1",
"versionEndExcluding": "6.1.165"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.1",
"versionEndExcluding": "6.6.128"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.1",
"versionEndExcluding": "6.12.75"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.1",
"versionEndExcluding": "6.18.16"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.1",
"versionEndExcluding": "6.19.6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.1",
"versionEndExcluding": "7.0"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/fd4a4d0711f48a99b25bcd45e00eef8339eff82d"
},
{
"url": "https://git.kernel.org/stable/c/6404898af86d986db1dbbe06177c143e40652e49"
},
{
"url": "https://git.kernel.org/stable/c/796e77c14c4c1e2cd36473760fb6cc66c695eb47"
},
{
"url": "https://git.kernel.org/stable/c/ac2d898da5095d46bd1ff8585fdd753d58ad91e7"
},
{
"url": "https://git.kernel.org/stable/c/a205740a7231e967ac77cb731171642901c327af"
},
{
"url": "https://git.kernel.org/stable/c/7b4d0fab3ff2c00c6d34e1952c9df5129a826aee"
},
{
"url": "https://git.kernel.org/stable/c/549c6db503dbb85dbff4840830971853feac6625"
},
{
"url": "https://git.kernel.org/stable/c/bc847787233277a337788568e90a6ee1557595eb"
}
],
"title": "drm/atmel-hlcdc: fix use-after-free of drm_crtc_commit after release",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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