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CVE-2021-47076— RDMA/rxe: Return CQE error if invalid lkey was supplied

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于LOCAL_WRITE 失败时 RXE 缺少 WQE 状态更新。

AI Predicted 7.8 Difficulty: Easy EPSS 0.23% · P12

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 8700e3e7c4857d28ebaa824509934556da0b3e76< a81e72d49b0648f68ab201163dbfc7841056d7a2 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< abe31d25facdb9109fe2cf69890748295291570c affected
8700e3e7c4857d28ebaa824509934556da0b3e76< dc07628bd2bbc1da768e265192c28ebd301f509d affected
4.8 affected
< 4.8 unaffected
5.10.241≤ 5.10.* unaffected
5.12.7≤ 5.12.* unaffected
5.13≤ * unaffected
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I. Basic Information for CVE-2021-47076

Vulnerability Information
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Vulnerability Title
RDMA/rxe: Return CQE error if invalid lkey was supplied
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Return CQE error if invalid lkey was supplied RXE is missing update of WQE status in LOCAL_WRITE failures. This caused the following kernel panic if someone sent an atomic operation with an explicitly wrong lkey. [leonro@vm ~]$ mkt test test_atomic_invalid_lkey (tests.test_atomic.AtomicTest) ... WARNING: CPU: 5 PID: 263 at drivers/infiniband/sw/rxe/rxe_comp.c:740 rxe_completer+0x1a6d/0x2e30 [rdma_rxe] Modules linked in: crc32_generic rdma_rxe ip6_udp_tunnel udp_tunnel rdma_ucm rdma_cm ib_umad ib_ipoib iw_cm ib_cm mlx5_ib ib_uverbs ib_core mlx5_core ptp pps_core CPU: 5 PID: 263 Comm: python3 Not tainted 5.13.0-rc1+ #2936 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 RIP: 0010:rxe_completer+0x1a6d/0x2e30 [rdma_rxe] Code: 03 0f 8e 65 0e 00 00 3b 93 10 06 00 00 0f 84 82 0a 00 00 4c 89 ff 4c 89 44 24 38 e8 2d 74 a9 e1 4c 8b 44 24 38 e9 1c f5 ff ff <0f> 0b e9 0c e8 ff ff b8 05 00 00 00 41 bf 05 00 00 00 e9 ab e7 ff RSP: 0018:ffff8880158af090 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff888016a78000 RCX: ffffffffa0cf1652 RDX: 1ffff9200004b442 RSI: 0000000000000004 RDI: ffffc9000025a210 RBP: dffffc0000000000 R08: 00000000ffffffea R09: ffff88801617740b R10: ffffed1002c2ee81 R11: 0000000000000007 R12: ffff88800f3b63e8 R13: ffff888016a78008 R14: ffffc9000025a180 R15: 000000000000000c FS: 00007f88b622a740(0000) GS:ffff88806d540000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f88b5a1fa10 CR3: 000000000d848004 CR4: 0000000000370ea0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rxe_do_task+0x130/0x230 [rdma_rxe] rxe_rcv+0xb11/0x1df0 [rdma_rxe] rxe_loopback+0x157/0x1e0 [rdma_rxe] rxe_responder+0x5532/0x7620 [rdma_rxe] rxe_do_task+0x130/0x230 [rdma_rxe] rxe_rcv+0x9c8/0x1df0 [rdma_rxe] rxe_loopback+0x157/0x1e0 [rdma_rxe] rxe_requester+0x1efd/0x58c0 [rdma_rxe] rxe_do_task+0x130/0x230 [rdma_rxe] rxe_post_send+0x998/0x1860 [rdma_rxe] ib_uverbs_post_send+0xd5f/0x1220 [ib_uverbs] ib_uverbs_write+0x847/0xc80 [ib_uverbs] vfs_write+0x1c5/0x840 ksys_write+0x176/0x1d0 do_syscall_64+0x3f/0x80 entry_SYSCALL_64_after_hwframe+0x44/0xae
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于LOCAL_WRITE 失败时 RXE 缺少 WQE 状态更新。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8700e3e7c4857d28ebaa824509934556da0b3e76 ~ a81e72d49b0648f68ab201163dbfc7841056d7a2 -
Linux Linux 4.8 -

II. Public POCs for CVE-2021-47076

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III. Intelligence Information for CVE-2021-47076

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Patches & Fixes for CVE-2021-47076 (1)

Other References for CVE-2021-47076 (2)

Same Patch Batch · Linux · 2024-03-01 · 13 CVEs total

CVE-2021-47081 7.8 HIGH habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory
CVE-2021-47078 7.8 HIGH RDMA/rxe: Clear all QP fields if creation failed
CVE-2021-47069 7.8 HIGH ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry
CVE-2021-47080 RDMA/core: Prevent divide-by-zero error triggered by the user
CVE-2021-47079 platform/x86: ideapad-laptop: fix a NULL pointer dereference
CVE-2021-47077 scsi: qedf: Add pointer checks in qedf_update_link_speed()
CVE-2021-47075 nvmet: fix memory leak in nvmet_alloc_ctrl()
CVE-2021-47074 nvme-loop: fix memory leak in nvme_loop_create_ctrl()
CVE-2021-47072 btrfs: fix removed dentries still existing after log is synced
CVE-2021-47073 platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios
CVE-2021-47071 uio_hv_generic: Fix a memory leak in error handling paths
CVE-2021-47070 uio_hv_generic: Fix another memory leak in error handling paths

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47076

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