CVE-2026-23207: spi: tegra210-quad: Protect curr_xfer check in IRQ handler

Severity: medium (CVSS 4.7 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-02-14 · updated 2026-10-30
Weakness: CWE-362

Description

In the Linux kernel, the following vulnerability has been resolved: spi: tegra210-quad: Protect curr_xfer check in IRQ handler Now that all other accesses to curr_xfer are done under the lock, protect the curr_xfer NULL check in tegra_qspi_isr_thread() with the spinlock. Without this protection, the following race can occur: CPU0 (ISR thread) CPU1 (timeout path) ---------------- ------------------- if (!tqspi->curr_xfer) // sees non-NULL spin_lock() tqspi->curr_xfer = NULL spin_unlock() handle_*_xfer() spin_lock() t = tqspi->curr_xfer // NULL! ... t->len ... // NULL dereference! With this patch, all curr_xfer accesses are now properly synchronized. Although all accesses to curr_xfer are done under the lock, in tegra_qspi_isr_thread() it checks for NULL, releases the lock and reacquires it later in handle_cpu_based_xfer()/handle_dma_based_xfer(). There is a potential for an update in between, which could cause a NULL pointer dereference. To handle this, add a NULL check inside the handlers after acquiring the lock. This ensures that if the timeout path has already cleared curr_xfer, the handler will safely return without dereferencing the NULL pointer.

Affected products

Linux kernel: from 5.15.198 before 5.16; from 6.1.160 before 6.2; from 6.6.120 before 6.7; from 6.12.63 before 6.13; from 6.17.13 before 6.18; from 6.18.2 before 6.18.10 — fixed in 5.16, 6.2, 6.7, 6.13, 6.18, 6.18.10
Linux: from 5.15.198 before 5.16; from 6.17.13 before 6.18 — fixed in 5.16, 6.18

How to fix

Upgrade to a fixed version: Linux kernel 5.16, 6.2, 6.7, 6.13; Linux 5.16, 6.18. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-23207 or the next vulnerability affects your stack