CVE-2026-31425 (GCVE-0-2026-31425)

Vulnerability from cvelistv5 – Published: 2026-04-13 13:40 – Updated: 2026-05-11 22:08
VLAI?
Title
rds: ib: reject FRMR registration before IB connection is established
Summary
In the Linux kernel, the following vulnerability has been resolved: rds: ib: reject FRMR registration before IB connection is established rds_ib_get_mr() extracts the rds_ib_connection from conn->c_transport_data and passes it to rds_ib_reg_frmr() for FRWR memory registration. On a fresh outgoing connection, ic is allocated in rds_ib_conn_alloc() with i_cm_id = NULL because the connection worker has not yet called rds_ib_conn_path_connect() to create the rdma_cm_id. When sendmsg() with RDS_CMSG_RDMA_MAP is called on such a connection, the sendmsg path parses the control message before any connection establishment, allowing rds_ib_post_reg_frmr() to dereference ic->i_cm_id->qp and crash the kernel. The existing guard in rds_ib_reg_frmr() only checks for !ic (added in commit 9e630bcb7701), which does not catch this case since ic is allocated early and is always non-NULL once the connection object exists. KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017] RIP: 0010:rds_ib_post_reg_frmr+0x50e/0x920 Call Trace: rds_ib_post_reg_frmr (net/rds/ib_frmr.c:167) rds_ib_map_frmr (net/rds/ib_frmr.c:252) rds_ib_reg_frmr (net/rds/ib_frmr.c:430) rds_ib_get_mr (net/rds/ib_rdma.c:615) __rds_rdma_map (net/rds/rdma.c:295) rds_cmsg_rdma_map (net/rds/rdma.c:860) rds_sendmsg (net/rds/send.c:1363) ____sys_sendmsg do_syscall_64 Add a check in rds_ib_get_mr() that verifies ic, i_cm_id, and qp are all non-NULL before proceeding with FRMR registration, mirroring the guard already present in rds_ib_post_inv(). Return -ENODEV when the connection is not ready, which the existing error handling in rds_cmsg_send() converts to -EAGAIN for userspace retry and triggers rds_conn_connect_if_down() to start the connection worker.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < c506456ebf84c50ed9327473d4e9bd905def212b (git)
Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < 82e4a3b56b23b844802056c9e75a39d24169b0a4 (git)
Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < 450ec93c0f172374acbf236f1f5f02d53650aa2d (git)
Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < 6b0a8de67ac0c74e1a7df92b73c862cb36780dfc (git)
Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < a5bfd14c9a299e6db4add4440430ee5e010b03ad (git)
Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < 23e07c340c445f0ebff7757ba15434cb447eb662 (git)
Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < 47de5b73db3b88f45c107393f26aeba26e9e8fae (git)
Affected: 1659185fb4d0025835eb2058a141f0746c5cab00 , < a54ecccfae62c5c85259ae5ea5d9c20009519049 (git)
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Linux Linux Affected: 4.6
Unaffected: 0 , < 4.6 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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          "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-\u003ec_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-\u003ei_cm_id-\u003eqp 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."
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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-\u003ei_cm_id-\u003eqp 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(). 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  }
}


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