{"id":"CVE-2026-46288","state":"PUBLISHED","title":"of: unittest: fix use-after-free in of_unittest_changeset()","description":"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.","publishedAt":"2026-06-08T15:41:31.868Z","updatedAt":"2026-08-05T12:31:02.134Z","severity":{"score":8.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"37318d1a27c9cc5a70d3cd7e49e30ec86f2b8ca1","versionType":"git"},{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"7f0f0926f3010b10cff5e93446258f971e42f2fd","versionType":"git"},{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"6fdad20b7975bdc32e85b45f8f7c640f6687b81f","versionType":"git"},{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"faecdd423c27f0d6090156a435ba9dbbac0eaddb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/of/unittest.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.86","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/of/unittest.c"]}],"references":["https://git.kernel.org/stable/c/37318d1a27c9cc5a70d3cd7e49e30ec86f2b8ca1","https://git.kernel.org/stable/c/7f0f0926f3010b10cff5e93446258f971e42f2fd","https://git.kernel.org/stable/c/6fdad20b7975bdc32e85b45f8f7c640f6687b81f","https://git.kernel.org/stable/c/faecdd423c27f0d6090156a435ba9dbbac0eaddb"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:07.131Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/46xxx/CVE-2026-46288.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-46288","state":"PUBLISHED","datePublished":"2026-06-08T15:41:31.868Z","dateUpdated":"2026-08-05T12:31:02.134Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-05-13T15:03:33.110Z"},"containers":{"cna":{"title":"of: unittest: fix use-after-free in of_unittest_changeset()","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"37318d1a27c9cc5a70d3cd7e49e30ec86f2b8ca1","versionType":"git"},{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"7f0f0926f3010b10cff5e93446258f971e42f2fd","versionType":"git"},{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"6fdad20b7975bdc32e85b45f8f7c640f6687b81f","versionType":"git"},{"version":"1c668ea65506e67ce2eae07b69bb09fcdd86e309","status":"affected","lessThan":"faecdd423c27f0d6090156a435ba9dbbac0eaddb","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/of/unittest.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"6.12","status":"affected"},{"version":"0","status":"unaffected","lessThan":"6.12","versionType":"semver"},{"version":"6.12.86","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.27","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.4","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/of/unittest.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T12:31:02.134Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}