{"id":"CVE-2026-31425","state":"PUBLISHED","title":"rds: ib: reject FRMR registration before IB connection is established","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: reject FRMR registration before IB connection is established\n\nrds_ib_get_mr() extracts the rds_ib_connection from conn->c_transport_data\nand passes it to rds_ib_reg_frmr() for FRWR memory registration. On a\nfresh outgoing connection, ic is allocated in rds_ib_conn_alloc() with\ni_cm_id = NULL because the connection worker has not yet called\nrds_ib_conn_path_connect() to create the rdma_cm_id. When sendmsg() with\nRDS_CMSG_RDMA_MAP is called on such a connection, the sendmsg path parses\nthe control message before any connection establishment, allowing\nrds_ib_post_reg_frmr() to dereference ic->i_cm_id->qp and crash the\nkernel.\n\nThe existing guard in rds_ib_reg_frmr() only checks for !ic (added in\ncommit 9e630bcb7701), which does not catch this case since ic is allocated\nearly and is always non-NULL once the connection object exists.\n\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:rds_ib_post_reg_frmr+0x50e/0x920\n Call Trace:\n  rds_ib_post_reg_frmr (net/rds/ib_frmr.c:167)\n  rds_ib_map_frmr (net/rds/ib_frmr.c:252)\n  rds_ib_reg_frmr (net/rds/ib_frmr.c:430)\n  rds_ib_get_mr (net/rds/ib_rdma.c:615)\n  __rds_rdma_map (net/rds/rdma.c:295)\n  rds_cmsg_rdma_map (net/rds/rdma.c:860)\n  rds_sendmsg (net/rds/send.c:1363)\n  ____sys_sendmsg\n  do_syscall_64\n\nAdd a check in rds_ib_get_mr() that verifies ic, i_cm_id, and qp are all\nnon-NULL before proceeding with FRMR registration, mirroring the guard\nalready present in rds_ib_post_inv(). Return -ENODEV when the connection\nis not ready, which the existing error handling in rds_cmsg_send() converts\nto -EAGAIN for userspace retry and triggers rds_conn_connect_if_down() to\nstart the connection worker.","publishedAt":"2026-04-13T13:40:28.911Z","updatedAt":"2026-05-11T22:08:27.602Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"c506456ebf84c50ed9327473d4e9bd905def212b","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"82e4a3b56b23b844802056c9e75a39d24169b0a4","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"450ec93c0f172374acbf236f1f5f02d53650aa2d","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"6b0a8de67ac0c74e1a7df92b73c862cb36780dfc","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"a5bfd14c9a299e6db4add4440430ee5e010b03ad","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"23e07c340c445f0ebff7757ba15434cb447eb662","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"47de5b73db3b88f45c107393f26aeba26e9e8fae","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"a54ecccfae62c5c85259ae5ea5d9c20009519049","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/ib_rdma.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.6","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/ib_rdma.c"]}],"references":["https://git.kernel.org/stable/c/c506456ebf84c50ed9327473d4e9bd905def212b","https://git.kernel.org/stable/c/82e4a3b56b23b844802056c9e75a39d24169b0a4","https://git.kernel.org/stable/c/450ec93c0f172374acbf236f1f5f02d53650aa2d","https://git.kernel.org/stable/c/6b0a8de67ac0c74e1a7df92b73c862cb36780dfc","https://git.kernel.org/stable/c/a5bfd14c9a299e6db4add4440430ee5e010b03ad","https://git.kernel.org/stable/c/23e07c340c445f0ebff7757ba15434cb447eb662","https://git.kernel.org/stable/c/47de5b73db3b88f45c107393f26aeba26e9e8fae","https://git.kernel.org/stable/c/a54ecccfae62c5c85259ae5ea5d9c20009519049"],"weaknesses":[],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/31xxx/CVE-2026-31425.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-31425","state":"PUBLISHED","datePublished":"2026-04-13T13:40:28.911Z","dateUpdated":"2026-05-11T22:08:27.602Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-03-09T15:48:24.088Z"},"containers":{"cna":{"title":"rds: ib: reject FRMR registration before IB connection is established","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nrds: ib: reject FRMR registration before IB connection is established\n\nrds_ib_get_mr() extracts the rds_ib_connection from conn->c_transport_data\nand passes it to rds_ib_reg_frmr() for FRWR memory registration. On a\nfresh outgoing connection, ic is allocated in rds_ib_conn_alloc() with\ni_cm_id = NULL because the connection worker has not yet called\nrds_ib_conn_path_connect() to create the rdma_cm_id. When sendmsg() with\nRDS_CMSG_RDMA_MAP is called on such a connection, the sendmsg path parses\nthe control message before any connection establishment, allowing\nrds_ib_post_reg_frmr() to dereference ic->i_cm_id->qp and crash the\nkernel.\n\nThe existing guard in rds_ib_reg_frmr() only checks for !ic (added in\ncommit 9e630bcb7701), which does not catch this case since ic is allocated\nearly and is always non-NULL once the connection object exists.\n\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:rds_ib_post_reg_frmr+0x50e/0x920\n Call Trace:\n  rds_ib_post_reg_frmr (net/rds/ib_frmr.c:167)\n  rds_ib_map_frmr (net/rds/ib_frmr.c:252)\n  rds_ib_reg_frmr (net/rds/ib_frmr.c:430)\n  rds_ib_get_mr (net/rds/ib_rdma.c:615)\n  __rds_rdma_map (net/rds/rdma.c:295)\n  rds_cmsg_rdma_map (net/rds/rdma.c:860)\n  rds_sendmsg (net/rds/send.c:1363)\n  ____sys_sendmsg\n  do_syscall_64\n\nAdd a check in rds_ib_get_mr() that verifies ic, i_cm_id, and qp are all\nnon-NULL before proceeding with FRMR registration, mirroring the guard\nalready present in rds_ib_post_inv(). Return -ENODEV when the connection\nis not ready, which the existing error handling in rds_cmsg_send() converts\nto -EAGAIN for userspace retry and triggers rds_conn_connect_if_down() to\nstart the connection worker."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"c506456ebf84c50ed9327473d4e9bd905def212b","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"82e4a3b56b23b844802056c9e75a39d24169b0a4","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"450ec93c0f172374acbf236f1f5f02d53650aa2d","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"6b0a8de67ac0c74e1a7df92b73c862cb36780dfc","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"a5bfd14c9a299e6db4add4440430ee5e010b03ad","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"23e07c340c445f0ebff7757ba15434cb447eb662","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"47de5b73db3b88f45c107393f26aeba26e9e8fae","versionType":"git"},{"version":"1659185fb4d0025835eb2058a141f0746c5cab00","status":"affected","lessThan":"a54ecccfae62c5c85259ae5ea5d9c20009519049","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/ib_rdma.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.6","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.6","versionType":"semver"},{"version":"5.10.253","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.203","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.168","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.134","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.81","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.22","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"6.19.12","status":"unaffected","lessThanOrEqual":"6.19.*","versionType":"semver"},{"version":"7.0","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/rds/ib_rdma.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/c506456ebf84c50ed9327473d4e9bd905def212b"},{"url":"https://git.kernel.org/stable/c/82e4a3b56b23b844802056c9e75a39d24169b0a4"},{"url":"https://git.kernel.org/stable/c/450ec93c0f172374acbf236f1f5f02d53650aa2d"},{"url":"https://git.kernel.org/stable/c/6b0a8de67ac0c74e1a7df92b73c862cb36780dfc"},{"url":"https://git.kernel.org/stable/c/a5bfd14c9a299e6db4add4440430ee5e010b03ad"},{"url":"https://git.kernel.org/stable/c/23e07c340c445f0ebff7757ba15434cb447eb662"},{"url":"https://git.kernel.org/stable/c/47de5b73db3b88f45c107393f26aeba26e9e8fae"},{"url":"https://git.kernel.org/stable/c/a54ecccfae62c5c85259ae5ea5d9c20009519049"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-05-11T22:08:27.602Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"5.10.253"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"5.15.203"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.1.168"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.6.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.12.81"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.18.22"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"6.19.12"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.6","versionEndExcluding":"7.0"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}