RDMA/core: Fix use after free in ib_query_qp()
Summary
| CVE | CVE-2026-92512 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-09-17 17:17:53 UTC |
| Updated | 2026-09-17 17:17:53 UTC |
| Description | In the Linux kernel, the following vulnerability has been resolved: RDMA/core: Fix use after free in ib_query_qp() When querying a QP via the netlink flow the only synchronization mechanism for the said QP is rdma_restrack_get(), meanwhile during the QP destroy path rdma_restrack_del() is called at the end of the ib_destroy_qp_user() function which is too late, since by then the vendor specific resources for said QP would already be destroyed, and till the rdma_restrack_del() is called this QP can still be accessed, which could cause the use after free below. Fix this by moving the rdma_restrack_begin_del() to the start of the ib_destroy_qp_user(), which in turn waits for all usages of the QP to be done then removes it from the database to prevent access to it while it is being destroyed. RIP: 0010:ib_query_qp+0x15/0x50 [ib_core] Code: 48 83 05 5d 8e b9 ff 01 eb b5 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 c7 46 40 00 00 00 00 48 c7 46 78 00 00 00 00 <48> 8b 07 48 8b 80 88 01 00 00 48 85 c0 74 1a 48 83 05 54 91 b9 ff RSP: 0018:ff11000108a8f2f0 EFLAGS: 00010202 RAX: 0000000000000000 RBX: ff11000108a8f370 RCX: ff11000108a8f370 RDX: 0000000000000000 RSI: ff11000108a8f3d8 RDI: 0000000000000000 RBP: ff1100010de5a000 R08: 0000000000000e80 R09: 0000000000000004 R10: ff110001057a604c R11: 0000000000000000 R12: ff11000108a8f370 R13: ff110001090e8000 R14: 0000000000000000 R15: ff110001057a602c FS: 00007f2ffd8db6c0(0000) GS:ff110008dc90b000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000000 CR3: 000000010b9a7004 CR4: 0000000000373eb0 Call Trace: <TASK> mlx5_ib_gsi_query_qp+0x21/0x50 [mlx5_ib] mlx5_ib_query_qp+0x689/0x9d0 [mlx5_ib] ib_query_qp+0x35/0x50 [ib_core] fill_res_qp_entry_query.isra.0+0x47/0x280 [ib_core] ? __wake_up+0x40/0x50 ? netlink_broadcast_filtered+0x15a/0x550 ? kobject_uevent_env+0x562/0x710 ? ep_poll_callback+0x242/0x270 ? __nla_put+0xc/0x20 ? nla_put+0x28/0x40 ? nla_put_string+0x2e/0x40 [ib_core] fill_res_qp_entry+0x138/0x190 [ib_core] res_get_common_dumpit+0x4a5/0x800 [ib_core] ? fill_res_qp_entry_query.isra.0+0x280/0x280 [ib_core] nldev_res_get_qp_dumpit+0x1e/0x30 [ib_core] netlink_dump+0x16f/0x450 __netlink_dump_start+0x1ce/0x2e0 rdma_nl_rcv_msg+0x1d3/0x330 [ib_core] ? nldev_res_get_qp_raw_dumpit+0x30/0x30 [ib_core] rdma_nl_rcv_skb.constprop.0.isra.0+0x108/0x180 [ib_core] rdma_nl_rcv+0x12/0x20 [ib_core] netlink_unicast+0x255/0x380 ? __alloc_skb+0xfa/0x1e0 netlink_sendmsg+0x1f3/0x420 __sock_sendmsg+0x38/0x60 ____sys_sendmsg+0x1e8/0x230 ? copy_msghdr_from_user+0xea/0x170 ___sys_sendmsg+0x7c/0xb0 ? __futex_wait+0x95/0xf0 ? __futex_wake_mark+0x40/0x40 ? futex_wait+0x67/0x100 ? futex_wake+0xac/0x1b0 __sys_sendmsg+0x5f/0xb0 do_syscall_64+0x55/0xb90 entry_SYSCALL_64_after_hwframe+0x4b/0x53 |
Risk And Classification
EPSS: 0.001730000 probability, percentile 0.070010000 (date 2026-09-18)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 514aee660df493cd673154a6ba6bab745ec47b8c 2ef2ea52ae41bd9efa83139e97ae839de7e17156 git | Not specified |
| CNA | Linux | Linux | affected 514aee660df493cd673154a6ba6bab745ec47b8c a608af8cde3dd38936b356bbdeedea0653a05b3f git | Not specified |
| CNA | Linux | Linux | affected 514aee660df493cd673154a6ba6bab745ec47b8c 8998829739c31fdbc892078e4449887d902e5dc9 git | Not specified |
| CNA | Linux | Linux | affected 514aee660df493cd673154a6ba6bab745ec47b8c 038cf231b7099ba6202dcc0c1ea01525122df09f git | Not specified |
| CNA | Linux | Linux | affected 514aee660df493cd673154a6ba6bab745ec47b8c 001383248e5d754bbddb7ae2a8573bc8501c85d8 git | Not specified |
| CNA | Linux | Linux | affected 514aee660df493cd673154a6ba6bab745ec47b8c 709ba0e5311bd034eb4d9c1c00cc4e1109d6dc3e git | Not specified |
| CNA | Linux | Linux | affected 5.15 | Not specified |
| CNA | Linux | Linux | unaffected 5.15 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.1.188 6.1.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.157 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.110 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.52 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.2.6 7.2.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.3-rc1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/709ba0e5311bd034eb4d9c1c00cc4e1109d6dc3e | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/2ef2ea52ae41bd9efa83139e97ae839de7e17156 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/a608af8cde3dd38936b356bbdeedea0653a05b3f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/001383248e5d754bbddb7ae2a8573bc8501c85d8 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/8998829739c31fdbc892078e4449887d902e5dc9 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/038cf231b7099ba6202dcc0c1ea01525122df09f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.