CVE-2026-89530
- Source
- https://cve.org/CVERecord?id=CVE-2026-89530
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89530.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-89530
- Downstream
AZL (1)
BELL (1)
DEBIAN (1)
openSUSE (2)
UBUNTU (1)
- Related
- Published
- 2026-09-11T19:44:10Z
- Modified
- 2026-10-24T02:30:31Z
- Severity
-
- 9.8 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- svcrdma: Reject inline replies that overflow the pull-up buffer
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89530.json" }- References
-
- https://git.kernel.org/stable/c/0fbe20dfe74b783d255bf389a6ea77aa25dc7860
- https://git.kernel.org/stable/c/1949dd1576f7a8aa161b1330c6125df9d53046d5
- https://git.kernel.org/stable/c/8068358f445a11296328ffa7c524701596814a17
- https://git.kernel.org/stable/c/8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cf
- https://git.kernel.org/stable/c/fcd91b9957462d398792201c239dffaeff1cc8b2
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89530.json
- https://nvd.nist.gov/vuln/detail/CVE-2026-89530
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducede248aa7be86e8179f20ac0931774ecd746f3f5bfFixed8068358f445a11296328ffa7c524701596814a17Fixedfcd91b9957462d398792201c239dffaeff1cc8b2Fixed1949dd1576f7a8aa161b1330c6125df9d53046d5Fixed8ec60eb51fae37cd3d334ff26e4a7d6fb21ff7cfFixed0fbe20dfe74b783d255bf389a6ea77aa25dc7860
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4.19.22Fixed4.20
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced4.20.9Fixed4.21
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced9b65b18f817d9ada2bf67351f24bdcce6789a0bb
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd564356e1919d1178568c19af410cfc1a9076663