CVE-2023-53106: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: st-nci: Fix use after free bug in ndlc_remove due to race condition This bug influences both st_nci_i2c_remove and st_nci_spi_remove. Take st_nci_i2c_remove as an example. In st_nci_i2c_probe, it called ndlc_probe and bound &ndlc->sm_work with llt_ndlc_sm_work. When it calls ndlc_recv or timeout handler, it will finally call schedule_work to start the work. When we call st_nci_i2c_remove to remove the driver, there may be a sequence as follows: Fix it by finishing the work before cleanup in ndlc_remove CPU0 CPU1 |llt_ndlc_sm_work st_nci_i2c_remove | ndlc_remove | st_nci_remove | nci_free_device| kfree(ndev) | //free ndlc->ndev | |llt_ndlc_rcv_queue |nci_recv_frame |//use ndlc->ndev

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CVSS v3.1 Score

7.8

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.17 — 4.14.311
linux	linux_kernel	4.15 — 4.19.279
linux	linux_kernel	4.20 — 5.4.238
linux	linux_kernel	5.5 — 5.10.176
linux	linux_kernel	5.11 — 5.15.104
linux	linux_kernel	5.16 — 6.1.21
linux	linux_kernel	6.2 — 6.2.8
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/2156490c4b7cacda9a18ec99929940b8376dc0e3 https://git.kernel.org/stable/c/3405eb641dafcc8b28d174784b203c1622c121bf https://git.kernel.org/stable/c/43aa468df246175207a7d5d7d6d31b231f15b49c https://git.kernel.org/stable/c/5000fe6c27827a61d8250a7e4a1d26c3298ef4f6 https://git.kernel.org/stable/c/5e331022b448fbc5e76f24349cd0246844dcad25 https://git.kernel.org/stable/c/84dd9cc34014e3a3dcce0eb6d54b8a067e97676b https://git.kernel.org/stable/c/b0c202a8dc63008205a5d546559736507a9aae66 https://git.kernel.org/stable/c/f589e5b56c562d99ea74e05b1c3f0eab78aa17a3

Frequently Asked Questions

What is CVE-2023-53106? +

In the Linux kernel, the following vulnerability has been resolved: nfc: st-nci: Fix use after free bug in ndlc_remove due to race condition This bug influences both st_nci_i2c_remove and st_nci_spi_remove. Take st_nci_i2c_remove as an example. In st_nci_i2c_probe, it called ndlc_probe and bound &ndlc->sm_work with llt_ndlc_sm_work. When it calls ndlc_recv or timeout handler, it will finally call schedule_work to start the work. When we call st_nci_i2c_remove to remove the driver, there may be a sequence as follows: Fix it by finishing the work before cleanup in ndlc_remove CPU0 CPU1 |llt_ndlc_sm_work st_nci_i2c_remove | ndlc_remove | st_nci_remove | nci_free_device| kfree(ndev) | //free ndlc->ndev | |llt_ndlc_rcv_queue |nci_recv_frame |//use ndlc->ndev It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2023-53106? +

CVE-2023-53106 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2023-53106? +

CVE-2023-53106 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2023-53106? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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