CVE-2024-46691 (GCVE-0-2024-46691)
Vulnerability from cvelistv5
Published
2024-09-13 05:29
Modified
2026-05-23 15:53
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: usb: typec: ucsi: Move unregister out of atomic section Commit '9329933699b3 ("soc: qcom: pmic_glink: Make client-lock non-sleeping")' moved the pmic_glink client list under a spinlock, as it is accessed by the rpmsg/glink callback, which in turn is invoked from IRQ context. This means that ucsi_unregister() is now called from atomic context, which isn't feasible as it's expecting a sleepable context. An effort is under way to get GLINK to invoke its callbacks in a sleepable context, but until then lets schedule the unregistration. A side effect of this is that ucsi_unregister() can now happen after the remote processor, and thereby the communication link with it, is gone. pmic_glink_send() is amended with a check to avoid the resulting NULL pointer dereference. This does however result in the user being informed about this error by the following entry in the kernel log: ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to send UCSI write request: -5
References
Impacted products
Vendor Product Version
Linux Linux Version: fbadcde1572f6b00e1e343d8b24ec8bf7f3ec08d
Version: 9329933699b32d467a99befa20415c4b2172389a
Version: 9329933699b32d467a99befa20415c4b2172389a
Version: 8d62ab7d89a4906385ea8c11a4b2475578bec0f0
Version: bd54d7c8e76d235b4a70be3a545eb13f5ac531e4
Version: 6.6.33   ≤
Version: 6.8.12   ≤
Version: 6.9.3   ≤
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: typec: ucsi: Move unregister out of atomic section\n\nCommit \u00279329933699b3 (\"soc: qcom: pmic_glink: Make client-lock\nnon-sleeping\")\u0027 moved the pmic_glink client list under a spinlock, as it\nis accessed by the rpmsg/glink callback, which in turn is invoked from\nIRQ context.\n\nThis means that ucsi_unregister() is now called from atomic context,\nwhich isn\u0027t feasible as it\u0027s expecting a sleepable context. An effort is\nunder way to get GLINK to invoke its callbacks in a sleepable context,\nbut until then lets schedule the unregistration.\n\nA side effect of this is that ucsi_unregister() can now happen\nafter the remote processor, and thereby the communication link with it, is\ngone. pmic_glink_send() is amended with a check to avoid the resulting NULL\npointer dereference.\nThis does however result in the user being informed about this error by\nthe following entry in the kernel log:\n\n  ucsi_glink.pmic_glink_ucsi pmic_glink.ucsi.0: failed to send UCSI write request: -5"
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