7.8

CVE-2026-98253: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-98253DEBIAN-CVE-2026-98253
Published 06-10-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-98253 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.14% chance of exploitation in the next 30 days, higher than 2.9% 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
0.14%
0%100%
Low · Change unavailable
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
OPENSUSE-SU-2026:12131-1

Timeline

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

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/ucma: Serialize join and leave on copy_to_user failure rdma_join_multicast() queues RoCE work that later reads the ucma_multicast through event->param.ud.private_data, then list_add()s the CMA multicast at the head of id_priv->mc_list. rdma_leave_multicast() matches only by sockaddr and destroys the first hit. ucma_process_join() used to drop ctx->mutex after a successful join and retake it only if copy_to_user() failed. Two concurrent JOIN_MCAST calls with the same address can therefore insert a second CMA entry before the first thread's leave. leave then cancels the newer work and the older worker still dereferences the ucma_multicast that the first thread frees. Keep ctx->mutex held from rdma_join_multicast() through copy_to_user() and, on -EFAULT, through rdma_leave_multicast() so leave cannot miss this join. Do not leave if join itself failed: that path never published this address on mc_list, and a leave-by-addr would destroy an earlier successful join.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.14%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

06-10-202621-10-2026
EPSS score
0.14%

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

No weakness data has been published for this record.

Affected systems

Ubuntu157 products
  • linuxAll versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.1.190-1 | < 6.12.113-1 | < 7.2.8-1
Linux1 product
  • linux≥ 60d613b39e8d0c9f3b526e9c96445422b4562d76, < 29b9ed83d8bfab5c6e11fcbf1aa836aa4ae26cb9 | ≥ fe454dc31e84f8c14cb8942fcb61666c9f40745b, < 52172e11bd074ccaded21740ffeb67123f01dd00 | ≥ fe454dc31e84f8c14cb8942fcb61666c9f40745b, < 01e29d0d78a8f66f221625720a04939eef5ec1f6 | ≥ fe454dc31e84f8c14cb8942fcb61666c9f40745b, < ae805d204cf1f15b87d1bf3529b4c649f3519420 | ≥ fe454dc31e84f8c14cb8942fcb61666c9f40745b, < 43c4e24bd10370fc976f6220518049ce71419399 | ≥ fe454dc31e84f8c14cb8942fcb61666c9f40745b, < 01cbdb724c584d7772fd25af2e4dfdf8527ce0d5 | ≥ fe454dc31e84f8c14cb8942fcb61666c9f40745b, < 83610ee5e498fa5bfcb80031d2b959baea276bf6 | ≥ fe454dc31e84f8c14cb8942fcb61666c9f40745b, < 662ade4de9ff5eceb0820a9f8e9fac70ba6a815b | a3262b3884dd67b4c5632ce7cdf9cff9d1a575d4 | ≥ 5.10.20, < 5.10.271 | ≥ 5.11.3, < 5.12 | 5.12

3 vendors · 159 products

References

12 links
Show all 12 references