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CVE-2026-31485

spi: spi-fsl-lpspi: fix teardown order issue (UAF)

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: spi: spi-fsl-lpspi: fix teardown order issue (UAF) There is a teardown order issue in the driver. The SPI controller is registered using devm_spi_register_controller(), which delays unregistration of the SPI controller until after the fsl_lpspi_remove() function returns. As the fsl_lpspi_remove() function synchronously tears down the DMA channels, a running SPI transfer triggers the following NULL pointer dereference due to use after free: | fsl_lpspi 42550000.spi: I/O Error in DMA RX | Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [...] | Call trace: | fsl_lpspi_dma_transfer+0x260/0x340 [spi_fsl_lpspi] | fsl_lpspi_transfer_one+0x198/0x448 [spi_fsl_lpspi] | spi_transfer_one_message+0x49c/0x7c8 | __spi_pump_transfer_message+0x120/0x420 | __spi_sync+0x2c4/0x520 | spi_sync+0x34/0x60 | spidev_message+0x20c/0x378 [spidev] | spidev_ioctl+0x398/0x750 [spidev] [...] Switch from devm_spi_register_controller() to spi_register_controller() in fsl_lpspi_probe() and add the corresponding spi_unregister_controller() in fsl_lpspi_remove().

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6; From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in ca4483f36ac1b62e69f8b182c5b8f059e0abecfb; From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in e3fd54f8b0317fbccc103961ddd660f2a32dcf0b; From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in adb25339b66112393fd6892ceff926765feb5b86; From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in d5d01f24bc6fbde40b4e567ef9160194b61267bc; From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3; From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in 15650dfbaeeb14bcaaf053b93cf631db8d465300; From 5314987de5e5f5e38436ef4a69328bc472bbd63e · fixed in b341c1176f2e001b3adf0b47154fc31589f7410e

  • Linux Linux

    4.10

  • KernelLinux

    From 4.10.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.131; From 6.7.0 · fixed in 6.12.80; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11

References 8

git.kernel.org