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As a result, the\nreference to kobj acquired at the start of the function will never be\nreleased.\n\nFix the leak by adding an explicit kobject_put() call when kn is NULL.","state":"PUBLISHED","assigner":"Linux","published_at":"2024-05-01 06:15:17","updated_at":"2026-05-12 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the Linux kernel, the following vulnerability has been resolved:\n\nfs: sysfs: Fix reference leak in sysfs_break_active_protection()\n\nThe sysfs_break_active_protection() routine has an obvious reference\nleak in its error path.  If the call to kernfs_find_and_get() fails then\nkn will be NULL, so the companion sysfs_unbreak_active_protection()\nroutine won't get called (and would only cause an access violation by\ntrying to dereference kn->parent if it was called).  As a result, the\nreference to kobj acquired at the start of the function will never be\nreleased.\n\nFix the leak by adding an explicit kobject_put() call when kn is NULL."}],"providerMetadata":{"dateUpdated":"2026-05-11T20:08:20.247Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f28bba37fe244889b81bb5c508d3f6e5c6e342c5"},{"url":"https://git.kernel.org/stable/c/57baab0f376bec8f54b0fe6beb8f77a57c228063"},{"url":"https://git.kernel.org/stable/c/84bd4c2ae9c3d0a7d3a5c032ea7efff17af17e17"},{"url":"https://git.kernel.org/stable/c/43f00210cb257bcb0387e8caeb4b46375d67f30c"},{"url":"https://git.kernel.org/stable/c/5d43e072285e81b0b63cee7189b3357c7768a43b"},{"url":"https://git.kernel.org/stable/c/ac107356aabc362aaeb77463e814fc067a5d3957"},{"url":"https://git.kernel.org/stable/c/a4c99b57d43bab45225ba92d574a8683f9edc8e4"},{"url":"https://git.kernel.org/stable/c/a90bca2228c0646fc29a72689d308e5fe03e6d78"}],"title":"fs: sysfs: Fix reference leak in sysfs_break_active_protection()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2024-26993","datePublished":"2024-05-01T05:28:02.462Z","dateReserved":"2024-02-19T14:20:24.206Z","dateUpdated":"2026-05-12T11:51:02.982Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2024-05-01 06:15:17","lastModifiedDate":"2026-05-12 12:16:29","problem_types":["NVD-CWE-Other"],"metrics":{"cvssMetricV31":[{"source":"nvd@nist.gov","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}]},"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.16.62","versionEndExcluding":"3.17","matchCriteriaId":"CF0E916A-2E85-4BDA-A6B9-628CB208D7E0"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.18.121","versionEndExcluding":"3.19","matchCriteriaId":"6B68BB35-4680-4400-8678-945038232436"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.4.154","versionEndExcluding":"4.5","matchCriteriaId":"71EA076B-AD00-432F-B156-0748605CE34D"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.9.125","versionEndExcluding":"4.10","matchCriteriaId":"6332802F-C91B-4C23-A155-60E41FC4345A"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.14.68","versionEndExcluding":"4.15","matchCriteriaId":"BB57F4AD-D25F-493E-85BA-74DDA52C7AA7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.18.6","versionEndExcluding":"4.19","matchCriteriaId":"2605C4B5-016B-469F-9FEE-CF497A18AE3B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.19","versionEndExcluding":"5.15.157","matchCriteriaId":"96AD9EA4-6E34-4C07-ACD9-AB23A8FD05AF"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.16","versionEndExcluding":"6.1.88","matchCriteriaId":"B665F958-644E-434D-A78D-CCD1628D1774"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.2","versionEndExcluding":"6.6.29","matchCriteriaId":"0999E154-1E68-41FA-8DE3-9A735E382224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.7","versionEndExcluding":"6.8.8","matchCriteriaId":"673B3328-389D-41A4-9617-669298635262"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:*","matchCriteriaId":"22BEDD49-2C6D-402D-9DBF-6646F6ECD10B"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:*","matchCriteriaId":"DF73CB2A-DFFD-46FB-9BFE-AA394F27EA37"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:*","matchCriteriaId":"52048DDA-FC5A-4363-95A0-A6357B4D7F8C"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:*","matchCriteriaId":"A06B2CCF-3F43-4FA9-8773-C83C3F5764B2"}]}]}]},"legacy_mitre":{"record":{"CveYear":"2024","CveId":"26993","Ordinal":"1","Title":"fs: sysfs: Fix reference leak in sysfs_break_active_protection()","CVE":"CVE-2024-26993","Year":"2024"},"notes":[{"CveYear":"2024","CveId":"26993","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfs: sysfs: Fix reference leak in sysfs_break_active_protection()\n\nThe sysfs_break_active_protection() routine has an obvious reference\nleak in its error path.  If the call to kernfs_find_and_get() fails then\nkn will be NULL, so the companion sysfs_unbreak_active_protection()\nroutine won't get called (and would only cause an access violation by\ntrying to dereference kn->parent if it was called).  As a result, the\nreference to kobj acquired at the start of the function will never be\nreleased.\n\nFix the leak by adding an explicit kobject_put() call when kn is NULL.","Type":"Description","Title":"fs: sysfs: Fix reference leak in sysfs_break_active_protection()"}]}}}