hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-98200
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:05 UTC
Updated2026-10-06 09:18:05 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: hwmon: (hp-wmi-sensors) Fix use-after-free in fungible_show() nsensor->current_state is dynamically replaced as the sensor's state changes. update_numeric_sensor_from_wobj() does this by freeing the old string and installing a new one: if (strcmp(trimmed, nsensor->current_state)) { new_string = hp_wmi_strdup(dev, trimmed); if (new_string) { devm_kfree(dev, nsensor->current_state); nsensor->current_state = new_string; } } This function is only ever called from hp_wmi_update_info() while state->lock is held, so the free-and-replace itself is properly serialized against concurrent updates. fungible_show(), however, reads the same pointer after the lock has already been dropped: err = hp_wmi_update_info(state, info); if (err) return err; switch (prop) { ... case HP_WMI_PROPERTY_CURRENT_STATE: seq_printf(seqf, "%s\n", nsensor->current_state); break; hp_wmi_update_info() takes state->lock internally and releases it before returning, so by the time fungible_show() dereferences nsensor->current_state in seq_printf(), no lock is held. Two processes reading a sensor's current_state debugfs entry at overlapping times (or one reading it while another read of the same sensor triggers a refresh) can race: one thread's seq_printf() can be part-way through printing the string at the moment another thread's call into update_numeric_sensor_from_wobj() frees it with devm_kfree() and installs a new pointer, causing a use-after-free read. Take state->lock around the read in fungible_show() as well, so it can never run concurrently with the free-and-replace in update_numeric_sensor_from_wobj().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 23902f98f8d4811ab84dde6419569a5b374f8122 b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795 git Not specified
CNA Linux Linux affected 23902f98f8d4811ab84dde6419569a5b374f8122 f59ecfd2c58bace39538f3fff7f43788b3fdb539 git Not specified
CNA Linux Linux affected 23902f98f8d4811ab84dde6419569a5b374f8122 72c85149794a1ccf8d718ffed1521106b5d31968 git Not specified
CNA Linux Linux affected 23902f98f8d4811ab84dde6419569a5b374f8122 9c1e65bc79ff104914b11e6ad972139296ec86fe git Not specified
CNA Linux Linux affected 23902f98f8d4811ab84dde6419569a5b374f8122 e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69 git Not specified
CNA Linux Linux affected 6.5 Not specified
CNA Linux Linux unaffected 6.5 semver Not specified
CNA Linux Linux unaffected 6.6.158 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.112 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.54 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e6cb0b4d4ecb8e71fd2200d907ab2e9663356f69 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6b2a638aa36c441b2c8d0b6bd8ed2bb9701e795 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/72c85149794a1ccf8d718ffed1521106b5d31968 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c1e65bc79ff104914b11e6ad972139296ec86fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f59ecfd2c58bace39538f3fff7f43788b3fdb539 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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