{"api_version":"1","generated_at":"2026-10-06T22:37:52+00:00","cve":"CVE-2026-98200","urls":{"html":"https://cve.report/CVE-2026-98200","api":"https://cve.report/api/cve/CVE-2026-98200.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-98200","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-98200"},"summary":{"title":"hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()\n\nnsensor->current_state is dynamically replaced as the sensor's state\nchanges. update_numeric_sensor_from_wobj() does this by freeing the\nold string and installing a new one:\n\n\tif (strcmp(trimmed, nsensor->current_state)) {\n\t\tnew_string = hp_wmi_strdup(dev, trimmed);\n\t\tif (new_string) {\n\t\t\tdevm_kfree(dev, nsensor->current_state);\n\t\t\tnsensor->current_state = new_string;\n\t\t}\n\t}\n\nThis function is only ever called from hp_wmi_update_info() while\nstate->lock is held, so the free-and-replace itself is properly\nserialized against concurrent updates.\n\nfungible_show(), however, reads the same pointer after the lock has\nalready been dropped:\n\n\terr = hp_wmi_update_info(state, info);\n\tif (err)\n\t\treturn err;\n\n\tswitch (prop) {\n\t...\n\tcase HP_WMI_PROPERTY_CURRENT_STATE:\n\t\tseq_printf(seqf, \"%s\\n\", nsensor->current_state);\n\t\tbreak;\n\nhp_wmi_update_info() takes state->lock internally and releases it\nbefore returning, so by the time fungible_show() dereferences\nnsensor->current_state in seq_printf(), no lock is held. Two\nprocesses reading a sensor's current_state debugfs entry at\noverlapping times (or one reading it while another read of the same\nsensor triggers a refresh) can race: one thread's seq_printf() can\nbe part-way through printing the string at the moment another\nthread's call into update_numeric_sensor_from_wobj() frees it with\ndevm_kfree() and installs a new pointer, causing a use-after-free\nread.\n\nTake state->lock around the read in fungible_show() as well, so it\ncan never run concurrently with the free-and-replace in\nupdate_numeric_sensor_from_wobj().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-10-06 09:18:05","updated_at":"2026-10-06 09:18:05"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69","name":"https://git.kernel.org/stable/c/e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795","name":"https://git.kernel.org/stable/c/b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/72c85149794a1ccf8d718ffed1521106b5d31968","name":"https://git.kernel.org/stable/c/72c85149794a1ccf8d718ffed1521106b5d31968","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9c1e65bc79ff104914b11e6ad972139296ec86fe","name":"https://git.kernel.org/stable/c/9c1e65bc79ff104914b11e6ad972139296ec86fe","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f59ecfd2c58bace39538f3fff7f43788b3fdb539","name":"https://git.kernel.org/stable/c/f59ecfd2c58bace39538f3fff7f43788b3fdb539","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-98200","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98200","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23902f98f8d4811ab84dde6419569a5b374f8122 b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23902f98f8d4811ab84dde6419569a5b374f8122 f59ecfd2c58bace39538f3fff7f43788b3fdb539 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23902f98f8d4811ab84dde6419569a5b374f8122 72c85149794a1ccf8d718ffed1521106b5d31968 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23902f98f8d4811ab84dde6419569a5b374f8122 9c1e65bc79ff104914b11e6ad972139296ec86fe git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 23902f98f8d4811ab84dde6419569a5b374f8122 e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.5","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.5 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.158 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.112 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.54 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.8 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc4 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["drivers/hwmon/hp-wmi-sensors.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795","status":"affected","version":"23902f98f8d4811ab84dde6419569a5b374f8122","versionType":"git"},{"lessThan":"f59ecfd2c58bace39538f3fff7f43788b3fdb539","status":"affected","version":"23902f98f8d4811ab84dde6419569a5b374f8122","versionType":"git"},{"lessThan":"72c85149794a1ccf8d718ffed1521106b5d31968","status":"affected","version":"23902f98f8d4811ab84dde6419569a5b374f8122","versionType":"git"},{"lessThan":"9c1e65bc79ff104914b11e6ad972139296ec86fe","status":"affected","version":"23902f98f8d4811ab84dde6419569a5b374f8122","versionType":"git"},{"lessThan":"e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69","status":"affected","version":"23902f98f8d4811ab84dde6419569a5b374f8122","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["drivers/hwmon/hp-wmi-sensors.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.5"},{"lessThan":"6.5","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.158","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.112","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.54","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.8","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc4","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.158","versionStartIncluding":"6.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.112","versionStartIncluding":"6.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.54","versionStartIncluding":"6.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.8","versionStartIncluding":"6.5","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc4","versionStartIncluding":"6.5","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()\n\nnsensor->current_state is dynamically replaced as the sensor's state\nchanges. update_numeric_sensor_from_wobj() does this by freeing the\nold string and installing a new one:\n\n\tif (strcmp(trimmed, nsensor->current_state)) {\n\t\tnew_string = hp_wmi_strdup(dev, trimmed);\n\t\tif (new_string) {\n\t\t\tdevm_kfree(dev, nsensor->current_state);\n\t\t\tnsensor->current_state = new_string;\n\t\t}\n\t}\n\nThis function is only ever called from hp_wmi_update_info() while\nstate->lock is held, so the free-and-replace itself is properly\nserialized against concurrent updates.\n\nfungible_show(), however, reads the same pointer after the lock has\nalready been dropped:\n\n\terr = hp_wmi_update_info(state, info);\n\tif (err)\n\t\treturn err;\n\n\tswitch (prop) {\n\t...\n\tcase HP_WMI_PROPERTY_CURRENT_STATE:\n\t\tseq_printf(seqf, \"%s\\n\", nsensor->current_state);\n\t\tbreak;\n\nhp_wmi_update_info() takes state->lock internally and releases it\nbefore returning, so by the time fungible_show() dereferences\nnsensor->current_state in seq_printf(), no lock is held. Two\nprocesses reading a sensor's current_state debugfs entry at\noverlapping times (or one reading it while another read of the same\nsensor triggers a refresh) can race: one thread's seq_printf() can\nbe part-way through printing the string at the moment another\nthread's call into update_numeric_sensor_from_wobj() frees it with\ndevm_kfree() and installs a new pointer, causing a use-after-free\nread.\n\nTake state->lock around the read in fungible_show() as well, so it\ncan never run concurrently with the free-and-replace in\nupdate_numeric_sensor_from_wobj()."}],"providerMetadata":{"dateUpdated":"2026-10-06T08:44:38.289Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795"},{"url":"https://git.kernel.org/stable/c/f59ecfd2c58bace39538f3fff7f43788b3fdb539"},{"url":"https://git.kernel.org/stable/c/72c85149794a1ccf8d718ffed1521106b5d31968"},{"url":"https://git.kernel.org/stable/c/9c1e65bc79ff104914b11e6ad972139296ec86fe"},{"url":"https://git.kernel.org/stable/c/e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69"}],"title":"hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-98200","datePublished":"2026-10-06T08:44:38.289Z","dateReserved":"2026-09-25T10:25:14.324Z","dateUpdated":"2026-10-06T08:44:38.289Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-10-06 09:18:05","lastModifiedDate":"2026-10-06 09:18:05","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"98200","Ordinal":"1","Title":"hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()","CVE":"CVE-2026-98200","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"98200","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nhwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()\n\nnsensor->current_state is dynamically replaced as the sensor's state\nchanges. update_numeric_sensor_from_wobj() does this by freeing the\nold string and installing a new one:\n\n\tif (strcmp(trimmed, nsensor->current_state)) {\n\t\tnew_string = hp_wmi_strdup(dev, trimmed);\n\t\tif (new_string) {\n\t\t\tdevm_kfree(dev, nsensor->current_state);\n\t\t\tnsensor->current_state = new_string;\n\t\t}\n\t}\n\nThis function is only ever called from hp_wmi_update_info() while\nstate->lock is held, so the free-and-replace itself is properly\nserialized against concurrent updates.\n\nfungible_show(), however, reads the same pointer after the lock has\nalready been dropped:\n\n\terr = hp_wmi_update_info(state, info);\n\tif (err)\n\t\treturn err;\n\n\tswitch (prop) {\n\t...\n\tcase HP_WMI_PROPERTY_CURRENT_STATE:\n\t\tseq_printf(seqf, \"%s\\n\", nsensor->current_state);\n\t\tbreak;\n\nhp_wmi_update_info() takes state->lock internally and releases it\nbefore returning, so by the time fungible_show() dereferences\nnsensor->current_state in seq_printf(), no lock is held. Two\nprocesses reading a sensor's current_state debugfs entry at\noverlapping times (or one reading it while another read of the same\nsensor triggers a refresh) can race: one thread's seq_printf() can\nbe part-way through printing the string at the moment another\nthread's call into update_numeric_sensor_from_wobj() frees it with\ndevm_kfree() and installs a new pointer, causing a use-after-free\nread.\n\nTake state->lock around the read in fungible_show() as well, so it\ncan never run concurrently with the free-and-replace in\nupdate_numeric_sensor_from_wobj().","Type":"Description","Title":"hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()"}]}}}