svcrdma: Reject Read lists that exceed the page budget
In the Linux kernel, the following vulnerability has been resolved: svcrdma: Reject Read lists that exceed the page budget Individual Read segment lengths are validated at decode time, but nothing prevents a requester from sending multiple segments whose cumulative length exceeds the rq_pages array budget. When one segment fills the page array exactly, the runtime guard in svc_rdma_build_read_segment() is bypassed because len reaches zero. A subsequent segment then accesses the NULL sentinel slot at rq_pages[rq_maxpages], resulting in a NULL pointer dereference during DMA mapping. Accumulate pages across all Read segments and reject the message at decode time when the total would overflow the page budget.
CVE-2026-89528
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89528
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "026d958b38c628a1b4ced534808945365e2747a5",
"lessThan": "beb4e9801f6362436102acc4cc5304b7324f9365",
"versionType": "git"
},
{
"status": "affected",
"version": "026d958b38c628a1b4ced534808945365e2747a5",
"lessThan": "e70fdb121171c3eb0ac34eb545721828cd737717",
"versionType": "git"
},
{
"status": "affected",
"version": "026d958b38c628a1b4ced534808945365e2747a5",
"lessThan": "1a3af2262cb384112ef38632de4690682be528b4",
"versionType": "git"
},
{
"status": "affected",
"version": "026d958b38c628a1b4ced534808945365e2747a5",
"lessThan": "465f511f59a0fa7a80d5d1073c4b24f28ea38f58",
"versionType": "git"
},
{
"status": "affected",
"version": "026d958b38c628a1b4ced534808945365e2747a5",
"lessThan": "0ca487abb3bdf581851664b5db21f364caf57682",
"versionType": "git"
}
],
"programFiles": [
"net/sunrpc/xprtrdma/svc_rdma_recvfrom.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.114",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/sunrpc/xprtrdma/svc_rdma_recvfrom.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89528
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #46670 · Revision 1
- Added to Heist Feed
- Publisher date