CVE-2026-23198
published 2026-02-14CVE-2026-23198: In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a KVM_IRQFD…
PriorityP422medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.12%
2.6th percentile
In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't clobber irqfd routing type when deassigning irqfd
When deassigning a KVM_IRQFD, don't clobber the irqfd's copy of the IRQ's
routing entry as doing so breaks kvm_arch_irq_bypass_del_producer() on x86
and arm64, which explicitly look for KVM_IRQ_ROUTING_MSI. Instead, to
handle a concurrent routing update, verify that the irqfd is still active
before consuming the routing information. As evidenced by the x86 and
arm64 bugs, and another bug in kvm_arch_update_irqfd_routing() (see below),
clobbering the entry type without notifying arch code is surprising and
error prone.
As a bonus, checking that the irqfd is active provides a convenient
location for documenting _why_ KVM must not consume the routing entry for
an irqfd that is in the process of being deassigned: once the irqfd is
deleted from the list (which happens *before* the eventfd is detached), it
will no longer receive updates via kvm_irq_routing_update(), and so KVM
could deliver an event using stale routing information (relative to
KVM_SET_GSI_ROUTING returning to userspace).
As an even better bonus, explicitly checking for the irqfd being active
fixes a similar bug to the one the clobbering is trying to prevent: if an
irqfd is deactivated, and then its routing is changed,
kvm_irq_routing_update() won't invoke kvm_arch_update_irqfd_routing()
(because the irqfd isn't in the list). And so if the irqfd is in bypass
mode, IRQs will continue to be posted using the old routing information.
As for kvm_arch_irq_bypass_del_producer(), clobbering the routing type
results in KVM incorrectly keeping the IRQ in bypass mode, which is
especially problematic on AMD as KVM tracks IRQs that are being posted to
a vCPU in a list whose lifetime is tied to the irqfd.
Without the help of KASAN to detect use-after-free, the most common
sympton on AMD is a NULL pointer deref in amd_iommu_update_ga() due to
the memory for irqfd structure being re-alloca
Affected
61 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | linux | < linux 6.1.164-1 (bookworm) | linux 6.1.164-1 (bookworm) |
| debian | linux-6.1 | < linux 6.1.164-1 (bookworm) | linux 6.1.164-1 (bookworm) |
| linux | linux | — | — |
| linux | linux | >= f70c20aaf141adb715a2d750c55154073b02a9c3 < 959a063e7f12524bc1871ad1f519787967bbcd45 | 959a063e7f12524bc1871ad1f519787967bbcd45 |
| linux | linux | >= f70c20aaf141adb715a2d750c55154073b02a9c3 < 2284bc168b148a17b5ca3b37b3d95c411f18a08d | 2284bc168b148a17b5ca3b37b3d95c411f18a08d |
| linux | linux | >= f70c20aaf141adb715a2d750c55154073b02a9c3 < 6d14ba1e144e796b5fc81044f08cfba9024ca195 | 6d14ba1e144e796b5fc81044f08cfba9024ca195 |
| linux | linux | >= f70c20aaf141adb715a2d750c55154073b02a9c3 < b61f9b2fcf181451d0a319889478cc53c001123e | b61f9b2fcf181451d0a319889478cc53c001123e |
| linux | linux | >= f70c20aaf141adb715a2d750c55154073b02a9c3 < ff48c9312d042bfbe826ca675e98acc6c623211c | ff48c9312d042bfbe826ca675e98acc6c623211c |
| linux | linux | >= f70c20aaf141adb715a2d750c55154073b02a9c3 < 4385b2f2843549bfb932e0dcf76bf4b065543a3c | 4385b2f2843549bfb932e0dcf76bf4b065543a3c |
| linux | linux | >= f70c20aaf141adb715a2d750c55154073b02a9c3 < b4d37cdb77a0015f51fee083598fa227cc07aaf1 | b4d37cdb77a0015f51fee083598fa227cc07aaf1 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 0 < 5.10.251-1 | 5.10.251-1 |
| linux | linux_kernel | >= 0 < 6.1.164-1 | 6.1.164-1 |
| linux | linux_kernel | >= 0 < 6.12.73-1 | 6.12.73-1 |
| linux | linux_kernel | >= 0 < 6.18.10-1 | 6.18.10-1 |
| linux | linux_kernel | >= 4.4 < 5.10.250 | 5.10.250 |
| linux | linux_kernel | >= 5.11 < 5.15.200 | 5.15.200 |
| linux | linux_kernel | >= 5.16 < 6.1.163 | 6.1.163 |
| linux | linux_kernel | >= 6.13 < 6.18.10 | 6.18.10 |
| linux | linux_kernel | >= 6.2 < 6.6.124 | 6.6.124 |
| linux | linux_kernel | >= 6.7 < 6.12.70 | 6.12.70 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-fips | — | — |
CVSS provenance
nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
osv5.5MEDIUM
vendor_debian7.8HIGH
vendor_redhat7.8HIGH
vendor_ubuntu7.8HIGH
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An attacker could possibly use these to compromise the system.
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An attacker could possibly use these to compromise the system.
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A local attacker could use this to escalate privileges, or possibly escape
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Several security issues were discovered in the Linux kernel.
An attacker could possibly use these to compromise the system.
This update corrects flaws in the following subsystems:
- ARM64 architecture;
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- Cryptographic API;
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Red Hat
kernel: KVM: Don't clobber irqfd routing type when deassigning irqfd
vendor_redhat·2026-02-14·CVSS 7.8
CVE-2026-23198 [HIGH] kernel: KVM: Don't clobber irqfd routing type when deassigning irqfd
kernel: KVM: Don't clobber irqfd routing type when deassigning irqfd
In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't clobber irqfd routing type when deassigning irqfd
When deassigning a KVM_IRQFD, don't clobber the irqfd's copy of the IRQ's
routing entry as doing so breaks kvm_arch_irq_bypass_del_producer() on x86
and arm64, which explicitly look for KVM_IRQ_ROUTING_MSI. Instead, to
handle a concurrent routing update, verify that the irqfd is still active
before consuming the routing information. As evidenced by the x86 and
arm64 bugs, and another bug in kvm_arch_update_irqfd_routing() (see below),
clobbering the entry type without notifying arch code is surprising and
error prone.
As a bonus, checking that the irqfd is active provides a convenient
location
Debian
CVE-2026-23198: linux - In the Linux kernel, the following vulnerability has been resolved: KVM: Don't ...
vendor_debian·2026·CVSS 7.8
CVE-2026-23198 [HIGH] CVE-2026-23198: linux - In the Linux kernel, the following vulnerability has been resolved: KVM: Don't ...
In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a KVM_IRQFD, don't clobber the irqfd's copy of the IRQ's routing entry as doing so breaks kvm_arch_irq_bypass_del_producer() on x86 and arm64, which explicitly look for KVM_IRQ_ROUTING_MSI. Instead, to handle a concurrent routing update, verify that the irqfd is still active before consuming the routing information. As evidenced by the x86 and arm64 bugs, and another bug in kvm_arch_update_irqfd_routing() (see below), clobbering the entry type without notifying arch code is surprising and error prone. As a bonus, checking that the irqfd is active provides a convenient location for documenting _why_ KVM must not consume the routing entry for an ir
VulDB
Linux Kernel up to 6.18.9 KVM kvm_arch_irq_bypass_del_producer null pointer dereference (Nessus ID 299082 / WID-SEC-2026-0421)
vuldb·2026-05-05·CVSS 5.5
CVE-2026-23198 [MEDIUM] Linux Kernel up to 6.18.9 KVM kvm_arch_irq_bypass_del_producer null pointer dereference (Nessus ID 299082 / WID-SEC-2026-0421)
A vulnerability was found in Linux Kernel up to 6.18.9. It has been classified as critical. Impacted is the function kvm_arch_irq_bypass_del_producer of the component KVM. The manipulation leads to null pointer dereference.
This vulnerability is listed as CVE-2026-23198. The attack must be carried out from within the local network. There is no available exploit.
Upgrading the affected component is recommended.
GHSA
GHSA-68jg-6v9h-662h: In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't clobber irqfd routing type when deassigning irqfd
When deassigning a
ghsa_unreviewed·2026-02-14
CVE-2026-23198 [MEDIUM] CWE-476 GHSA-68jg-6v9h-662h: In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't clobber irqfd routing type when deassigning irqfd
When deassigning a
In the Linux kernel, the following vulnerability has been resolved:
KVM: Don't clobber irqfd routing type when deassigning irqfd
When deassigning a KVM_IRQFD, don't clobber the irqfd's copy of the IRQ's
routing entry as doing so breaks kvm_arch_irq_bypass_del_producer() on x86
and arm64, which explicitly look for KVM_IRQ_ROUTING_MSI. Instead, to
handle a concurrent routing update, verify that the irqfd is still active
before consuming the routing information. As evidenced by the x86 and
arm64 bugs, and another bug in kvm_arch_update_irqfd_routing() (see below),
clobbering the entry type without notifying arch code is surprising and
error prone.
As a bonus, checking that the irqfd is active provides a convenient
location for documenting _why_ KVM must not consume the routing entry for
an
OSV
CVE-2026-23198: In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a KV
osv·2026-02-14·CVSS 5.5
CVE-2026-23198 [MEDIUM] CVE-2026-23198: In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a KV
In the Linux kernel, the following vulnerability has been resolved: KVM: Don't clobber irqfd routing type when deassigning irqfd When deassigning a KVM_IRQFD, don't clobber the irqfd's copy of the IRQ's routing entry as doing so breaks kvm_arch_irq_bypass_del_producer() on x86 and arm64, which explicitly look for KVM_IRQ_ROUTING_MSI. Instead, to handle a concurrent routing update, verify that the irqfd is still active before consuming the routing information. As evidenced by the x86 and arm64 bugs, and another bug in kvm_arch_update_irqfd_routing() (see below), clobbering the entry type without notifying arch code is surprising and error prone. As a bonus, checking that the irqfd is active provides a convenient location for documenting _why_ KVM must not consume the routing entry for an ir
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/2284bc168b148a17b5ca3b37b3d95c411f18a08dhttps://git.kernel.org/stable/c/4385b2f2843549bfb932e0dcf76bf4b065543a3chttps://git.kernel.org/stable/c/6d14ba1e144e796b5fc81044f08cfba9024ca195https://git.kernel.org/stable/c/959a063e7f12524bc1871ad1f519787967bbcd45https://git.kernel.org/stable/c/b4d37cdb77a0015f51fee083598fa227cc07aaf1https://git.kernel.org/stable/c/b61f9b2fcf181451d0a319889478cc53c001123ehttps://git.kernel.org/stable/c/ff48c9312d042bfbe826ca675e98acc6c623211c
2026-02-14
Published