CVE-2026-23207 spi: tegra210-quad: Protect curr_xfer check in IRQ handler
A race condition in the Tegra210 QSPI driver allows a NULL pointer dereference, leading to a kernel crash and denial of service.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-23207?
CVE-2026-23207 is a medium-severity vulnerability in Linux kernel, published on 14 Feb 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official 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.
Which versions are affected by CVE-2026-23207?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2026-23207?
Apply the vendor's patch.
Is CVE-2026-23207 being exploited?
There is no known exploitation of CVE-2026-23207 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-80106, BELL-CVE-2026-23207, DEBIAN-CVE-2026-23207, GHSA-5xf5-gq7p-jfx7, ROOT-OS-DEBIAN-12-CVE-2026-23207, ROOT-OS-DEBIAN-13-CVE-2026-23207 and 3 more.