CVE-2023-53501: In the Linux kernel, the following vulnerability has been resolved: iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind When…

PriorityP415medium4.7CVSS 3.1

AVLACHPRLUINSUCNINAH

EPSS

0.14%

3.6th percentile

In the Linux kernel, the following vulnerability has been resolved:

iommu/amd/iommu_v2: Fix pasid_state refcount dec hit 0 warning on pasid unbind

When unbinding pasid - a race condition exists vs outstanding page faults.

To prevent this, the pasid_state object contains a refcount.
* set to 1 on pasid bind
* incremented on each ppr notification start
* decremented on each ppr notification done
* decremented on pasid unbind

Since refcount_dec assumes that refcount will never reach 0:
the current implementation causes the following to be invoked on
pasid unbind:
REFCOUNT_WARN("decrement hit 0; leaking memory")

Fix this issue by changing refcount_dec to refcount_dec_and_test
to explicitly handle refcount=1.

Affected

14 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.55-1 (bookworm)	linux 6.1.55-1 (bookworm)
linux	linux	—	—
linux	linux	>= 8bc54824da4e8fcf0ed679cf09ac32f23d83254a < a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22	a50d60b8f2aff46dd7c7edb4a5835cdc4d432c22
linux	linux	>= 8bc54824da4e8fcf0ed679cf09ac32f23d83254a < 13ed255248dfbbb7f23f9170c7a537fb9ca22c73	13ed255248dfbbb7f23f9170c7a537fb9ca22c73
linux	linux	>= 8bc54824da4e8fcf0ed679cf09ac32f23d83254a < 9ccc51be3126b25cfe9351dbffde946c925cc28a	9ccc51be3126b25cfe9351dbffde946c925cc28a
linux	linux	>= 8bc54824da4e8fcf0ed679cf09ac32f23d83254a < 98d86bf32187db27946ca817c2467a5f2f7aa02f	98d86bf32187db27946ca817c2467a5f2f7aa02f
linux	linux	>= 8bc54824da4e8fcf0ed679cf09ac32f23d83254a < 534103bcd52ca9c1fecbc70e717b4a538dc4ded8	534103bcd52ca9c1fecbc70e717b4a538dc4ded8
linux	linux_kernel	>= 0 < 6.1.55-1	6.1.55-1
linux	linux_kernel	>= 0 < 6.5.3-1	6.5.3-1
linux	linux_kernel	>= 0 < 6.5.3-1	6.5.3-1
linux	linux_kernel	>= 5.15 < 5.15.132	5.15.132
linux	linux_kernel	>= 5.16 < 6.1.53	6.1.53
linux	linux_kernel	>= 6.2 < 6.4.16	6.4.16
linux	linux_kernel	>= 6.5 < 6.5.3	6.5.3

CVSS provenance

nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

osv4.7MEDIUM

vendor_debian4.7MEDIUM

vendor_redhat4.7MEDIUM

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