RDMA/umem: Fix double dma_buf_unpin in failure path

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Summary

CVECVE-2026-43128
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-06 12:16:29 UTC
Updated2026-05-08 17:52:13 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: RDMA/umem: Fix double dma_buf_unpin in failure path In ib_umem_dmabuf_get_pinned_with_dma_device(), the call to ib_umem_dmabuf_map_pages() can fail. If this occurs, the dmabuf is immediately unpinned but the umem_dmabuf->pinned flag is still set. Then, when ib_umem_release() is called, it calls ib_umem_dmabuf_revoke() which will call dma_buf_unpin() again. Fix this by removing the immediate unpin upon failure and just let the ib_umem_release/revoke path handle it. This also ensures the proper unmap-unpin unwind ordering if the dmabuf_map_pages call happened to fail due to dma_resv_wait_timeout (and therefore has a non-NULL umem_dmabuf->sgt).

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000130000 probability, percentile 0.024500000 (date 2026-05-12)

Problem Types: CWE-415

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 1e4df4a21c5ac722df1099eee30cad9246c889b5 70542b69abff34d24b11ae0bb200cc7a766d18df git Not specified
CNA Linux Linux affected 1e4df4a21c5ac722df1099eee30cad9246c889b5 b324327ff6f48d8065dca67eb3b91357e72726bd git Not specified
CNA Linux Linux affected 1e4df4a21c5ac722df1099eee30cad9246c889b5 ba3bf0f1bf1d5d0404678485e872980532fcc2c4 git Not specified
CNA Linux Linux affected 1e4df4a21c5ac722df1099eee30cad9246c889b5 d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf git Not specified
CNA Linux Linux affected 1e4df4a21c5ac722df1099eee30cad9246c889b5 40126bcbefa79ea86672e05dae608596bab38319 git Not specified
CNA Linux Linux affected 1e4df4a21c5ac722df1099eee30cad9246c889b5 104016eb671e19709721c1b0048dd912dc2e96be git Not specified
CNA Linux Linux affected 5.16 Not specified
CNA Linux Linux unaffected 5.16 semver Not specified
CNA Linux Linux unaffected 6.1.165 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.128 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.75 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.16 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.6 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/104016eb671e19709721c1b0048dd912dc2e96be 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/70542b69abff34d24b11ae0bb200cc7a766d18df 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/ba3bf0f1bf1d5d0404678485e872980532fcc2c4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/40126bcbefa79ea86672e05dae608596bab38319 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/b324327ff6f48d8065dca67eb3b91357e72726bd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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