CVE-2026-90218

RDMA/cma: Fix WARNING in res_to_rt

State: Published
Severity: Not scored
Published: Sep 17, 2026
Updated: Oct 19, 2026
Reserved: Sep 11, 2026

Description

In the Linux kernel, the following vulnerability has been resolved:

RDMA/cma: Fix WARNING in res_to_rt

syzbot reported a WARN_ON(!res->dev) in res_to_rt() triggered via addr_handler() during asynchronous address resolution:

" WARNING: drivers/infiniband/core/restrack.c:138 at res_to_rt+0x1c4/0x230 CPU#1: kworker/u8:4/59 Modules linked in: CPU: 1 UID: 0 PID: 59 Comm: kworker/u8:4 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Compute Engine, BIOS Google 07/24/2026 Workqueue: ib_addr process_one_req RIP: 0010:res_to_rt+0x1c4/0x230 drivers/infiniband/core/restrack.c:138 RSP: 0018:ffffc9000201f850 EFLAGS: 00010293 RAX: ffffffff88d00ce5 RBX: ffff88807f0fd4f8 RCX: ffff88801e6e0000 RDX: 0000000000000000 RSI: ffffffff8fd996f0 RDI: 0000000000000003 RBP: 0000000000000000 R08: ffff88801e6e0000 R09: 000000000000000a R10: 0000000000000009 R11: 0000000000000000 R12: dffffc0000000000 R13: 1ffff1100fe1fa9f R14: 0000000000000000 R15: 0000000000000003 FS: 0000000000000000(0000) GS:ffff888125012000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00001d559c3d2000 CR3: 0000000077c4c000 CR4: 00000000003526f0 Call Trace: <TASK> rdma_restrack_add+0x5a/0x8a0 drivers/infiniband/core/restrack.c:236 addr_handler+0x41a/0x5a0 drivers/infiniband/core/cma.c:3534 process_one_req+0x2eb/0x540 drivers/infiniband/core/addr.c:624 process_one_work kernel/workqueue.c:3375 [inline] process_scheduled_works+0xc4e/0x1630 kernel/workqueue.c:3458 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3539 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 </TASK> "

In addr_handler(), cma_acquire_dev_by_src_ip() is called to populate id_priv->cma_dev and bind the associated ib_device to id_priv->id.device. If cma_acquire_dev_by_src_ip() returns an error (non-zero status), the ID remains unassociated with any RDMA device.

Previously, rdma_restrack_add(&id_priv->res) was invoked unconditionally even when cma_acquire_dev_by_src_ip() failed, passing a resource with a NULL dev pointer and triggering the WARN_ON assertion in res_to_rt().

Fix this by only adding the resource to restrack when acquiring the device succeeds.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	c5ebaca402f5c5bd61ac8316feb2aa3a0be4d4a8 to before 1d7e55ea64dd15769318ba2e0fe0956db82ba3c3Affected cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 39e83bb77fc92344cd62a373b311f096d812e548Affected cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 9c80273d663959504957606b9a24fe901ee2a4a1Affected cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 2a63cb9ea862ac7d947952b497eef6520853538cAffected cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before f72957e0b31f2962f4c1089a9223f1206aa26983Affected cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 544e40805dbb6cfe64916bd4c8b238fec585ac2aAffected cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5bAffected cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before c6d1ec4fbe56492bb88987d577f04a5fb6955f26Affected 073fdf539d4c022162db3d77a5afca1710f0de2dAffected fa37a461bd6d9ee86e891ba3e4074a450e44c881Affected 5.10.37 to before 5.10.270Affected 5.11.21 to before 5.12Affected 5.12.4 to before 5.13Affected
LinuxLinux	5.13Affected before 5.13Not affected 5.10.270 through 5.10.Not affected 5.15.221 through 5.15.Not affected 6.1.188 through 6.1.Not affected 6.6.157 through 6.6.Not affected 6.12.110 through 6.12.Not affected 6.18.52 through 6.18.Not affected 7.2.6 through 7.2.*Not affected 7.3 and laterNot affected

Product

Versions

LinuxLinux

c5ebaca402f5c5bd61ac8316feb2aa3a0be4d4a8 to before 1d7e55ea64dd15769318ba2e0fe0956db82ba3c3Affected
cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 39e83bb77fc92344cd62a373b311f096d812e548Affected
cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 9c80273d663959504957606b9a24fe901ee2a4a1Affected
cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 2a63cb9ea862ac7d947952b497eef6520853538cAffected
cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before f72957e0b31f2962f4c1089a9223f1206aa26983Affected
cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 544e40805dbb6cfe64916bd4c8b238fec585ac2aAffected
cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before 64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5bAffected
cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa to before c6d1ec4fbe56492bb88987d577f04a5fb6955f26Affected
073fdf539d4c022162db3d77a5afca1710f0de2dAffected
fa37a461bd6d9ee86e891ba3e4074a450e44c881Affected
5.10.37 to before 5.10.270Affected
5.11.21 to before 5.12Affected
5.12.4 to before 5.13Affected

LinuxLinux

5.13Affected
before 5.13Not affected
5.10.270 through 5.10.*Not affected
5.15.221 through 5.15.*Not affected
6.1.188 through 6.1.*Not affected
6.6.157 through 6.6.*Not affected
6.12.110 through 6.12.*Not affected
6.18.52 through 6.18.*Not affected
7.2.6 through 7.2.*Not affected
7.3 and laterNot affected

References

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