9.8

CVE-2026-89530: linux

CVSS: 9.8v3.1CriticalReceived
AliasesUBUNTU-CVE-2026-89530DEBIAN-CVE-2026-89530
Published 11-09-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-89530 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.46% chance of exploitation in the next 30 days, higher than 38.3% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.46%
0%100%
Low · -0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 6 · Duplicates 1 · Related 2
OPENSUSE-SU-2026:11880-1OPENSUSE-SU-2026:22091-1RHSA-2026:77498RHSA-2026:77500RHSA-2026:77689RHSA-2026:77690

Timeline

  1. 11-09-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject inline replies that overflow the pull-up buffer An RPC-over-RDMA client can request a reply, such as an NFS READ payload, without providing a Write list or a Reply chunk to carry it. When such a reply needs more scatter/gather entries than the device's Send Queue supports, svc_rdma_pull_up_needed() selects pull-up and svc_rdma_pull_up_reply_msg() linearizes the whole reply into sctxt->sc_xprt_buf. That buffer is only sc_max_req_size bytes, while the reply on this path is bounded only by the client's request, so svc_rdma_xb_linearize() copies past the end of the buffer and corrupts adjacent slab memory. The oversized length is then stored in sc_sges[0].length and posted, so the device also reads beyond the mapped region. The SGE-exhaustion branch is the only pull-up path that can exceed the buffer: the threshold branch pulls up only replies smaller than RPCRDMA_PULLUP_THRESH, and replies that fit the device's SGE budget are sent directly without linearization. Make svc_rdma_pull_up_needed() report -E2BIG when the reply it would pull up cannot fit sc_max_req_size, and fail the request with ERR_CHUNK as RFC 8166 Section 4.5.3 directs rather than dropping the connection. The helper no longer answers a simple yes/no question: it now reports pull-up, no pull-up, or -E2BIG for a reply too large to linearize. Rename svc_rdma_pull_up_needed() to svc_rdma_check_pull_up() so its name no longer implies a boolean predicate.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.46%

Chance of exploitation in the next 30 days

Percentile

38%

Versus all other CVEs

30-day change

-0.01 pp

From 0.46% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.46%

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

Ubuntu165 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)
Debian2 products
  • linuxAll versions (No fix recorded) | < 6.12.111-1 | < 7.2.6-1
  • linux-6.12< 6.12.111-1~deb12u1
Linux1 product
  • linux≥ e248aa7be86e8179f20ac0931774ecd746f3f5bf, < fcd91b9957462d398792201c239dffaeff1cc8b2 | ≥ e248aa7be86e8179f20ac0931774ecd746f3f5bf, < 1949dd1576f7a8aa161b1330c6125df9d53046d5 | ≥ e248aa7be86e8179f20ac0931774ecd746f3f5bf, < 8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf | ≥ e248aa7be86e8179f20ac0931774ecd746f3f5bf, < 0fbe20dfe74b783d255bf389a6ea77aa25dc7860 | 9b65b18f817d9ada2bf67351f24bdcce6789a0bb | d564356e1919d1178568c19af410cfc1a9076663 | ≥ 4.19.22, < 4.20 | ≥ 4.20.9, < 4.21 | 5.0

3 vendors · 168 products

References

8 links