RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp rxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the IB_QP_STATE path, so it holds no state_lock and runs while the responder task rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting only that attribute calls free_rd_atomic_resources() then alloc_rd_atomic_resources(), swapping qp->resp.resources[] while rxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources() also leaves the cached pointer qp->resp.res dangling. A local unprivileged user can race the free/realloc into a use-after-free in rxe_receiver() (local DoS). Drain recv_task around the swap with rxe_disable_task()/rxe_enable_task(), as rxe_qp_reset() already does when tearing this array down, re-enabling only after alloc_rd_atomic_resources() succeeds so the responder never resumes against a NULL qp->resp.resources on the ENOMEM path. Also clear qp->resp.res in free_rd_atomic_resources(), like the rxe_resp.c completion paths. Reproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone.
CVE-2026-80864
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-2026-80864
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": "8700e3e7c4857d28ebaa824509934556da0b3e76",
"lessThan": "82257379061c0a7aba6c77081d988339982af115",
"versionType": "git"
},
{
"status": "affected",
"version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
"lessThan": "0136b528b753c5a56e4d997ef20b86bb6750b8fb",
"versionType": "git"
},
{
"status": "affected",
"version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
"lessThan": "ffa4f0be69656be1755090f02db38d49816585c6",
"versionType": "git"
},
{
"status": "affected",
"version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
"lessThan": "d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844",
"versionType": "git"
},
{
"status": "affected",
"version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
"lessThan": "60dfd47929cd1e7070daa810d40ce538d888410d",
"versionType": "git"
},
{
"status": "affected",
"version": "8700e3e7c4857d28ebaa824509934556da0b3e76",
"lessThan": "6f7014237405e7f032b5c53a82d9eccf6161c291",
"versionType": "git"
}
],
"programFiles": [
"drivers/infiniband/sw/rxe/rxe_qp.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "4.8"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "4.8",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.160",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.108",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.49",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.13",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2.3",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/infiniband/sw/rxe/rxe_qp.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-80864
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #46641 · Revision 1
- Added to Heist Feed
- Publisher date