DEBIAN-CVE-2023-53501
Record from OSV · Published October 1, 2025
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.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| linux | Debian:12 | 6.1.55-1 |
| linux | Debian:13 | 6.5.3-1 |
| linux | Debian:14 | 6.5.3-1 |
Risk scores
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | linux | 6.1.55-1~bpo11+1, 0, 6.1.27-1 |
| Debian:13 | linux | 0 |
| Debian:14 | linux | 0 |
Timeline
- Oct 1, 2025 CVE Published
- Oct 26, 2026 CVE Updated
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