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CVE-2024-58084

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

firmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool()

Commit 2e4955167ec5 ("firmware: qcom: scm: Fix __scm and waitq completion variable initialization") introduced a write barrier in probe function to store global '__scm' variable. We all known barriers are paired (see memory-barriers.txt: "Note that write barriers should normally be paired with read or address-dependency barriers"), therefore accessing it from concurrent contexts requires read barrier. Previous commit added such barrier in qcom_scm_is_available(), so let's use that directly.

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Lack of this read barrier can result in fetching stale '__scm' variable value, NULL, and dereferencing it.

Note that barrier in qcom_scm_is_available() satisfies here the control dependency.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool()\n\nCommit 2e4955167ec5 (\"firmware: qcom: scm: Fix __scm and waitq\ncompletion variable initialization\") introduced a write barrier in probe\nfunction to store global '__scm' variable.  We all known barriers are\npaired (see memory-barriers.txt: \"Note that write barriers should\nnormally be paired with read or address-dependency barriers\"), therefore\naccessing it from concurrent contexts requires read barrier.  Previous\ncommit added such barrier in qcom_scm_is_available(), so let's use that\ndirectly.\n\nLack of this read barrier can result in fetching stale '__scm' variable\nvalue, NULL, and dereferencing it.\n\nNote that barrier in qcom_scm_is_available() satisfies here the control\ndependency."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: firmware: qcom: scm: Fix missing read barrier in qcom_scm_get_tzmem_pool() el commit 2e4955167ec5 (\"firmware: qcom: scm: Fix __scm and waitq ending variable initialization\") introdujo una barrera de escritura en la función de sondeo para almacenar la variable global '__scm'. Todos sabemos que las barreras están emparejadas (consulte memory-barriers.txt: \"Note que las barreras de escritura normalmente deben emparejarse con barreras de lectura o de dependencia de dirección\"), por lo tanto, acceder a ellas desde contextos concurrentes requiere una barrera de lectura. Una confirmación anterior agregó dicha barrera en qcom_scm_is_available(), así que usémosla directamente. La falta de esta barrera de lectura puede resultar en la obtención del valor de la variable '__scm' obsoleto, NULL, y su desreferenciación. Tenga en cuenta que la barrera en qcom_scm_is_available() satisface aquí la dependencia de control."
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