{"id":"CVE-2026-80864","state":"PUBLISHED","title":"RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp\n\nrxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the\nIB_QP_STATE path, so it holds no state_lock and runs while the responder\ntask rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting\nonly that attribute calls free_rd_atomic_resources() then\nalloc_rd_atomic_resources(), swapping qp->resp.resources[] while\nrxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources()\nalso leaves the cached pointer qp->resp.res dangling. A local\nunprivileged user can race the free/realloc into a use-after-free in\nrxe_receiver() (local DoS).\n\nDrain recv_task around the swap with rxe_disable_task()/rxe_enable_task(),\nas rxe_qp_reset() already does when tearing this array down, re-enabling\nonly after alloc_rd_atomic_resources() succeeds so the responder never\nresumes against a NULL qp->resp.resources on the ENOMEM path. Also clear\nqp->resp.res in free_rd_atomic_resources(), like the rxe_resp.c\ncompletion paths.\n\nReproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone.","publishedAt":"2026-09-04T15:55:18.791Z","updatedAt":"2026-10-30T12:31:20.192Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"87e40635d77aa19088550698c81eb295d5131f71","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"82257379061c0a7aba6c77081d988339982af115","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"0136b528b753c5a56e4d997ef20b86bb6750b8fb","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"ffa4f0be69656be1755090f02db38d49816585c6","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"60dfd47929cd1e7070daa810d40ce538d888410d","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"6f7014237405e7f032b5c53a82d9eccf6161c291","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/rxe/rxe_qp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/rxe/rxe_qp.c"]}],"references":["https://git.kernel.org/stable/c/87e40635d77aa19088550698c81eb295d5131f71","https://git.kernel.org/stable/c/82257379061c0a7aba6c77081d988339982af115","https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb","https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6","https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844","https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d","https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291"],"weaknesses":[],"ingestedAt":"2026-10-30T12:50:04.827Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/80xxx/CVE-2026-80864.json","commit":"1f312381e38164a43607eebab851b151dd16861e","baselineCommit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-80864","state":"PUBLISHED","datePublished":"2026-09-04T15:55:18.791Z","dateUpdated":"2026-10-30T12:31:20.192Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-26T14:34:25.798Z"},"containers":{"cna":{"title":"RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp\n\nrxe_qp_from_attr() handles IB_QP_MAX_DEST_RD_ATOMIC outside the\nIB_QP_STATE path, so it holds no state_lock and runs while the responder\ntask rxe_receiver() (recv_task on rxe_wq) is live. A modify_qp() setting\nonly that attribute calls free_rd_atomic_resources() then\nalloc_rd_atomic_resources(), swapping qp->resp.resources[] while\nrxe_prepare_res()/find_resource() walk it; free_rd_atomic_resources()\nalso leaves the cached pointer qp->resp.res dangling. A local\nunprivileged user can race the free/realloc into a use-after-free in\nrxe_receiver() (local DoS).\n\nDrain recv_task around the swap with rxe_disable_task()/rxe_enable_task(),\nas rxe_qp_reset() already does when tearing this array down, re-enabling\nonly after alloc_rd_atomic_resources() succeeds so the responder never\nresumes against a NULL qp->resp.resources on the ENOMEM path. Also clear\nqp->resp.res in free_rd_atomic_resources(), like the rxe_resp.c\ncompletion paths.\n\nReproduced under KASAN; the slab-use-after-free in rxe_receiver() is gone."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"87e40635d77aa19088550698c81eb295d5131f71","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"82257379061c0a7aba6c77081d988339982af115","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"0136b528b753c5a56e4d997ef20b86bb6750b8fb","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"ffa4f0be69656be1755090f02db38d49816585c6","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"60dfd47929cd1e7070daa810d40ce538d888410d","versionType":"git"},{"version":"8700e3e7c4857d28ebaa824509934556da0b3e76","status":"affected","lessThan":"6f7014237405e7f032b5c53a82d9eccf6161c291","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/rxe/rxe_qp.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.8","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.8","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.108","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.49","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.13","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2.3","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/infiniband/sw/rxe/rxe_qp.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/87e40635d77aa19088550698c81eb295d5131f71"},{"url":"https://git.kernel.org/stable/c/82257379061c0a7aba6c77081d988339982af115"},{"url":"https://git.kernel.org/stable/c/0136b528b753c5a56e4d997ef20b86bb6750b8fb"},{"url":"https://git.kernel.org/stable/c/ffa4f0be69656be1755090f02db38d49816585c6"},{"url":"https://git.kernel.org/stable/c/d4cd32eb8bd2b0ffbdc7b1f3d82ce6a371f8f844"},{"url":"https://git.kernel.org/stable/c/60dfd47929cd1e7070daa810d40ce538d888410d"},{"url":"https://git.kernel.org/stable/c/6f7014237405e7f032b5c53a82d9eccf6161c291"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-30T12:31:20.192Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.12.108"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"6.18.49"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.1.13"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.2.3"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.8","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}