{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-46288", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-05-13T15:03:33.110Z", "datePublished": "2026-06-08T15:41:31.868Z", "dateUpdated": "2026-08-05T12:31:02.134Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:31:02.134Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nof: unittest: fix use-after-free in of_unittest_changeset()\n\nThe variable 'parent' is assigned the value of 'nchangeset' earlier in the\nfunction, meaning both point to the same struct device_node. The call to\nof_node_put(nchangeset) can decrement the reference count to zero and\nfree the node if there are no other holders. After that, the code still\nuses 'parent' to check for the presence of a property and to read a\nstring property, leading to a use-after-free.\n\nFix this by moving the of_node_put() call after the last access to\n'parent', avoiding the UAF." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable code runs only during late_initcall boot self-tests in drivers/of/unittest.c; reaching it requires local ability to build and boot a kernel with CONFIG_OF_UNITTEST enabled, with no network, syscall, or ioctl runtime path.\nAC:L - Once the unittest kernel boots, the UAF triggers deterministically after of_changeset_revert() when of_node_put() drops the sole reference; no race or attacker-uncontrolled memory layout is required.\nPR:N - Exploitation does not require privileges on a running production system—only booting a specially built unittest kernel—so no authenticated local user or namespace capability on the target image is needed.\nUI:N - The unittest executes automatically during kernel initialization after testcase DT data is attached; no additional victim interaction beyond booting the test configuration is required.\nS:U - The UAF corrupts kernel heap memory during in-kernel device-tree self-tests and does not cross VM, sandbox, or IOMMU security boundaries.\nC:H - After of_node_put() frees the device_node, of_property_present() and of_property_read_string() dereference freed memory, enabling kernel information disclosure from attacker-influencable freed heap contents.\nI:H - Use-after-free on a struct device_node in kernel heap can be leveraged for memory corruption and arbitrary kernel code execution via heap grooming, not merely a bounded write.\nA:H - Dereferencing a freed device_node during property lookups can cause kernel oops, BUG, or panic during boot-time unittest execution." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/of/unittest.c" ], "versions": [ { "version": "1c668ea65506e67ce2eae07b69bb09fcdd86e309", "lessThan": "37318d1a27c9cc5a70d3cd7e49e30ec86f2b8ca1", "status": "affected", "versionType": "git" }, { "version": "1c668ea65506e67ce2eae07b69bb09fcdd86e309", "lessThan": "7f0f0926f3010b10cff5e93446258f971e42f2fd", "status": "affected", "versionType": "git" }, { "version": "1c668ea65506e67ce2eae07b69bb09fcdd86e309", "lessThan": "6fdad20b7975bdc32e85b45f8f7c640f6687b81f", "status": "affected", "versionType": "git" }, { "version": "1c668ea65506e67ce2eae07b69bb09fcdd86e309", "lessThan": "faecdd423c27f0d6090156a435ba9dbbac0eaddb", "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/of/unittest.c" ], "versions": [ { "version": "6.12", "status": "affected" }, { "version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.86", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.27", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.4", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "6.12", "versionEndExcluding": "6.12.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.27" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.0.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/37318d1a27c9cc5a70d3cd7e49e30ec86f2b8ca1" }, { "url": "https://git.kernel.org/stable/c/7f0f0926f3010b10cff5e93446258f971e42f2fd" }, { "url": "https://git.kernel.org/stable/c/6fdad20b7975bdc32e85b45f8f7c640f6687b81f" }, { "url": "https://git.kernel.org/stable/c/faecdd423c27f0d6090156a435ba9dbbac0eaddb" } ], "title": "of: unittest: fix use-after-free in of_unittest_changeset()", "x_generator": { "engine": "bippy-1.2.0" } } } }