7.8

CVE-2026-43128: RDMA/umem: Fix double dma_buf_unpin in failure path

Modified
AliasesUBUNTU-CVE-2026-43128DEBIAN-CVE-2026-43128
Published 06-05-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-43128 is a high (CVSS 7.8) Double Free vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 3.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.14%
0%100%
Low · -0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 30 · Related 23
OPENSUSE-SU-2026:21388-1RHSA-2026:19568RHSA-2026:19569RHSA-2026:27713RHSA-2026:33215RHSA-2026:33900

Timeline

  1. 06-05-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In 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).

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Decrease -0.04 pp

From 0.18% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu130 products
  • linux< 6.8.0-134.134 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1060.63 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 1e4df4a21c5ac722df1099eee30cad9246c889b5, < 70542b69abff34d24b11ae0bb200cc7a766d18df | ≥ 1e4df4a21c5ac722df1099eee30cad9246c889b5, < b324327ff6f48d8065dca67eb3b91357e72726bd | ≥ 1e4df4a21c5ac722df1099eee30cad9246c889b5, < ba3bf0f1bf1d5d0404678485e872980532fcc2c4 | ≥ 1e4df4a21c5ac722df1099eee30cad9246c889b5, < d3e32e2f3262f1b25d77c085ace38e2cc4ad75cf | ≥ 1e4df4a21c5ac722df1099eee30cad9246c889b5, < 40126bcbefa79ea86672e05dae608596bab38319 | ≥ 1e4df4a21c5ac722df1099eee30cad9246c889b5, < 104016eb671e19709721c1b0048dd912dc2e96be | 5.16
  • linux_kernel≥ 5.16, < 6.1.165 | ≥ 6.2, < 6.6.128 | ≥ 6.7, < 6.12.75 | ≥ 6.13, < 6.18.16 | ≥ 6.19, < 6.19.6 | 7.0:rc1
Debian1 product
  • linux< 6.1.170-1 | < 6.12.85-1 | < 6.19.6-1

3 vendors · 133 products

References

22 links
Show all 22 references