CVE-2026-90218

CVE CVE-2026-90218EUVD EUVD-2026-81811Published 2026-09-17T16:07:30.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <9c80273d663959504957606b9a24fe901ee2a4a1; 5.11.21 <5.12; 073fdf539d4c022162db3d77a5afca1710f0de2d; patch: 6.1.188; patch: 7.2.6; patch: 6.6.157; cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <64a2bd4cfc16c24f0a0e6321a2fd00ffde3e0a5b; patch: 5.15.221; patch: 6.18.52; cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <f72957e0b31f2962f4c1089a9223f1206aa26983; cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <2a63cb9ea862ac7d947952b497eef6520853538c; 5.10.37 <5.10.270; 5.12.4 <5.13; patch: 5.10.270; c5ebaca402f5c5bd61ac8316feb2aa3a0be4d4a8 <1d7e55ea64dd15769318ba2e0fe0956db82ba3c3; patch: 7.3-rc1; fa37a461bd6d9ee86e891ba3e4074a450e44c881; patch: 6.12.110; patch: 0; cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <c6d1ec4fbe56492bb88987d577f04a5fb6955f26; cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <544e40805dbb6cfe64916bd4c8b238fec585ac2a; 5.13; cb5cd0ea4eb3ce338a593a5331ddb4986ae20faa <39e83bb77fc92344cd62a373b311f096d812e548

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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