CVE-2026-31485
spi: spi-fsl-lpspi: fix teardown order issue (UAF)
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().
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| Linux Linux |
≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6 (affected, git) ≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < ca4483f36ac1b62e69f8b182c5b8f059e0abecfb (affected, git) ≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < e3fd54f8b0317fbccc103961ddd660f2a32dcf0b (affected, git) ≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < adb25339b66112393fd6892ceff926765feb5b86 (affected, git) ≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < d5d01f24bc6fbde40b4e567ef9160194b61267bc (affected, git) ≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3 (affected, git) ≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < 15650dfbaeeb14bcaaf053b93cf631db8d465300 (affected, git) ≥ 5314987de5e5f5e38436ef4a69328bc472bbd63e; < b341c1176f2e001b3adf0b47154fc31589f7410e (affected, git) Other versions: unaffected |
CNA: Linux |
| Linux Linux |
4.10 (affected) ≥ 0; < 4.10 (unaffected, semver) ≥ 5.10.253; ≤ 5.10.* (unaffected, semver) ≥ 5.15.203; ≤ 5.15.* (unaffected, semver) ≥ 6.1.168; ≤ 6.1.* (unaffected, semver) ≥ 6.6.131; ≤ 6.6.* (unaffected, semver) ≥ 6.12.80; ≤ 6.12.* (unaffected, semver) ≥ 6.18.21; ≤ 6.18.* (unaffected, semver) ≥ 6.19.11; ≤ 6.19.* (unaffected, semver) ≥ 7.0; ≤ * (unaffected, original_commit_for_fix) Other versions: affected |
CNA: Linux |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.6; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.5; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
| SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Siemens |
≥ V3.1.7; < * (affected, custom)
Other versions: unknown |
ADP: siemens-SADP |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
No CVSS assessment reported. An unscored record is not a low-severity determination.
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://git.kernel.org/stable/c/fbe6f40caeebb0b1ea9dfedc259124c1d3cda7a6CNA: Linux
- https://git.kernel.org/stable/c/ca4483f36ac1b62e69f8b182c5b8f059e0abecfbCNA: Linux
- https://git.kernel.org/stable/c/e3fd54f8b0317fbccc103961ddd660f2a32dcf0bCNA: Linux
- https://git.kernel.org/stable/c/adb25339b66112393fd6892ceff926765feb5b86CNA: Linux
- https://git.kernel.org/stable/c/d5d01f24bc6fbde40b4e567ef9160194b61267bcCNA: Linux
- https://git.kernel.org/stable/c/e89e2b97253c124d37bf88e96e5e8ce5c3aeeec3CNA: Linux
- https://git.kernel.org/stable/c/15650dfbaeeb14bcaaf053b93cf631db8d465300CNA: Linux
- https://git.kernel.org/stable/c/b341c1176f2e001b3adf0b47154fc31589f7410eCNA: Linux
- https://cert-portal.siemens.com/productcert/html/ssa-082556.htmlADP: siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-019113.htmlADP: siemens-SADP
- https://cert-portal.siemens.com/productcert/html/ssa-457936.htmlADP: siemens-SADP
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