7.8

CVE-2026-43120: linux Double Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2026-43120DEBIAN-CVE-2026-43120CGA-86c2-vxc5-rggw
Published 06-05-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-43120 is a high (CVSS 7.8) Double Free vulnerability in linux. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 6.6% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.18%
0%100%
Low · +0.05 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 126 · Related 126
LSN-0122-1OPENSUSE-SU-2026:21555-1SUSE-SU-2026:2195-1SUSE-SU-2026:2238-1SUSE-SU-2026:22598-1SUSE-SU-2026:22673-1

Showing 100 of 127. Use Open JSON for the complete list.

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/irdma: Fix double free related to rereg_user_mr If IB_MR_REREG_TRANS is set during rereg_user_mr, the umem will be released and a new one will be allocated in irdma_rereg_mr_trans. If any step of irdma_rereg_mr_trans fails after the new umem is allocated, it releases the umem, but does not set iwmr->region to NULL. The problem is that this failure is propagated to the user, who will then call ibv_dereg_mr (as they should). Then, the dereg_mr path will see a non-NULL umem and attempt to call ib_umem_release again. Fix this by setting iwmr->region to NULL after ib_umem_release. Fixed: 5ac388db27c4 ("RDMA/irdma: Add support to re-register a memory region")

CVSS metrics

6 scores · 5 sources · 2 versions

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

+0.05 pp

From 0.12% on 21-09-2026

21-09-202621-10-2026
EPSS score
0.18%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu130 products
  • linux< 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Chainguard6 products
  • linux-aws-6.18< 6.18.24-r1
  • linux-azure-6.18< 6.18.31-r0
  • linux-gcp-6.18< 6.18.31-r0
  • linux-qemu-6.18< 6.18.31-r0
  • linux-qemu-6.18-bootc-boot-installed< 6.18.31-r0
Linux2 products
  • linux≥ 715fdb3b30541cc8180b7cdc6aa9f8c307afdf25, < 62298a48f8b8788ad8b8464e6ffdf1ddebd2217e | ≥ 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 66964118f1f50ed85001c8fc9f7ab5bbdd021ee0 | ≥ 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 0f22c32141acdcda266b26cab2b830baf870f3e0 | ≥ 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 0c5d70bcb9d2275a1c8515a924016fcfeb4ab441 | ≥ 5ac388db27c443dadfbb0b8b23fa7ccf429d901a, < 29a3edd7004bb635d299fb9bc6f0ea4ef13ed5a2 | ≥ 6.6.120, < 6.6.136 | 6.7
  • linux_kernel≥ 6.6.120, < 6.6.136 | ≥ 6.7, < 6.12.83 | ≥ 6.13, < 6.18.24 | ≥ 6.19, < 6.19.14 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5
Debian1 product
  • linux< 6.12.85-1 | < 6.19.14-1

4 vendors · 139 products

References

26 links
Show all 26 references