CVE-2026-90218

RDMA/cma: Fix WARNING in res_to_rt

N/A

Published: September 17, 2026 at 04:07 PM UTC

Updated: October 19, 2026 at 09:19 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

N/A

Exploit prediction

EPSS 0.2%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

90%

073fdf539d4c022162db3d77a5afca1710f0de2d5.10.37 5.11.21 5.12.4 5.1373fdf539d4c22162db3d77a5afca1710f0de2dc5ebaca402f5c5bd61ac8316feb2aa3a0be4d4a8cb5cd0ea4eb3ce338a593a5331ddb4986ae20faafa37a461bd6d9ee86e891ba3e4074a450e44c881

Vendor states this is fixed in 1d7e55ea64dd15769318ba2e0fe0956db82ba3c3 (fixed)

Vendor states this is fixed in 2a63cb9ea862ac7d947952b497eef6520853538c (fixed)

Vendor states this is fixed in 39e83bb77fc92344cd62a373b311f096d812e548 (fixed)

Vendor states this is fixed in 544e40805dbb6cfe64916bd4c8b238fec585ac2a (fixed)

Vendor states this is fixed in 64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5b (fixed)

Vendor states this is fixed in 9c80273d663959504957606b9a24fe901ee2a4a1 (fixed)

Vendor states this is fixed in c6d1ec4fbe56492bb88987d577f04a5fb6955f26 (fixed)

Vendor states this is fixed in f72957e0b31f2962f4c1089a9223f1206aa26983 (fixed)

Vendor states this is fixed in 5.10.270 (unaffected)

Affected range stops below 5.12, so it looks safe — our inference, not a vendor statement

Vendor states this is fixed in 5.13 (unaffected)

Vendor states this is fixed in 5.15.221 (unaffected)