CVE-2026-64462

What the bug is

The chained IRQ handler is set during probe, but is only removed during the driver remove(). If pci_host_probe() fails, the handler and INTx IRQ domain remain set even though the devm-managed host bridge storage containing struct altera_pcie will be released, leaving the handler with a stale data pointer. Interrupts are also enabled before pci_host_probe() is called. If probe fails after that point, the controller interrupt source should be disabled before the chained handler and INTx domain are removed. So set the chained handler only after the INTx domain has been created. Disable controller interrupts during IRQ teardown, and tear the IRQ setup down if pci_host_probe() fails. [mani: commit log]

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

drivers/pci/controller/pcie-altera.c

What this is

PCI DRIVER FOR ALTERA PCIE IPMAINTAINERS section matched on drivers/pci/controller/pcie-altera.c · linux-pci@vger.kernel.org · Orphan

Kernel module

none to look for. The file would have gone into pcie_altera, and Debian does not compile it into that module, so finding pcie_altera in lsmod would say nothing about this CVE.

Check it on the machine

grep -w CONFIG_PCIE_ALTERA /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

Show whether Debian builds this, per release

Debian does not build this code. In 5 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sid, bookworm · linux-6.12n

n

not enabled on any flavour - this release does not build the code

Build switch

CONFIG_PCIE_ALTERA

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-07-25 (3 months ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.18%, higher than 7.5% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/pci

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
5.9	5.10.261	af7cf5d56d7d
5.9	5.15.212	9cf0cc481e16
5.9	6.1.178	99fc088d6cc6
5.9	6.6.145	a25bfa2a6665
5.9	6.12.97	0db9aa9ec51b
5.9	6.18.39	09c43b7b7d29
5.9	7.1.4	6864c789b570
5.9	7.2	7a94138caeb2

Debian advisories