scsi: storvsc: Fix swiotlb bounce buffer leak in confidential VM
Published Aug 21, 2024
6.1
MEDIUMCVSS 3.1
EPSS 0.21%
Description
storvsc_queuecommand() maps the scatter/gather list using scsi_dma_map(), which in a confidential VM allocates swiotlb bounce buffers. If the I/O submission fails in storvsc_do_io(), the I/O is typically retried by higher level code, but the bounce buffer memory is never freed. The mostly like cause of I/O submission failure is a full VMBus channel ring buffer, which is not uncommon under high I/O loads. Eventually enough bounce buffer memory leaks that the confidential VM can't do any I/O. The same problem can arise in a non-confidential VM with kernel boot parameter swiotlb=force.
Fix this by doing scsi_dma_unmap() in the case of an I/O submission error, which frees the bounce buffer memory.
Affected products
-
- Version 743b237c3a7bStatusaffectedConstraints<67ff3d0a49f3
- Version 743b237c3a7bStatusaffectedConstraints<87c71e88f6a6
- Version
-
- Version 5.17StatusaffectedConstraints-
- Version 0StatusunaffectedConstraints<5.17
- Version 6.1.7StatusunaffectedConstraints<=6.1.*
- Version 6.2StatusunaffectedConstraints<=*
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
- ≥ 5.17 · < 6.1.7
- 6.2
- 6.2
- 6.2
No data.
Red Hat Enterprise Linux 6
kernel
Out of support scope
Red Hat Enterprise Linux 7
kernel
Out of support scope
Red Hat Enterprise Linux 7
kernel-rt
Out of support scope
Red Hat Enterprise Linux 8
kernel
Fix deferred
Red Hat Enterprise Linux 8
kernel-rt
Fix deferred
Red Hat Enterprise Linux 9
kernel
Fix deferred
Red Hat Enterprise Linux 9
kernel-rt
Fix deferred
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | kernel | Out of support scope | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Out of support scope | n/a |
| Red Hat Enterprise Linux 8 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 8 | kernel-rt | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | kernel | Fix deferred | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Fix deferred | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Sep 10, 2024 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2024–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (5 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.21% (0.00208) | 9.84th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.21% (0.00208) | 10.89th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.03% (0.00028) | 4.82th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00043) | 10.81th | v3 (v2023.03.01) |
| Aug 22, 2024 | 0.04% (0.00043) | 9.54th | v3 (v2023.03.01) |
References (7)
- https://access.redhat.com/security/cve/CVE-2022-48890 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2306411 Issue Tracking
- https://git.kernel.org/stable/c/67ff3d0a49f3d445c3922e30a54e03c161da561e Patch
- https://git.kernel.org/stable/c/87c71e88f6a6619ffb1ff88f84dff48ef6d57adb Patch
- https://lore.kernel.org/linux-cve-announce/2024082109-CVE-2022-48890-7f36@gregkh/T
- https://nvd.nist.gov/vuln/detail/CVE-2022-48890
- https://www.cve.org/CVERecord?id=CVE-2022-48890
Change history (0)
No recorded changes yet.