Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2021-47124— io_uring: fix link timeout refs

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 io_uring 模块的 io_link_timeout_fn() 方法中存在错误。

CVSS 7.8 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff< 0b2a990e5d2f76d020cb840c456e6ec5f0c27530 affected
1c20e9040f49687ba2ccc2ffd4411351a6c2ebff< 6f5d7a45f58d3abe3a936de1441b8d6318f978ff affected
9ae1f8dd372e0e4c020b345cf9e09f519265e981< 876808dba2ff7509bdd7f230c4f374a0caf4f410 affected
9ae1f8dd372e0e4c020b345cf9e09f519265e981< ff4a96ba5c8f9b266706280ff8021d2ef3f17e86 affected
9ae1f8dd372e0e4c020b345cf9e09f519265e981< a298232ee6b9a1d5d732aa497ff8be0d45b5bd82 affected
567c81912cec641db75ac6cb64c63f8367c97d19 affected
5.10.26< 5.10.43 affected
5.10.26< 5.10.55 affected
… +8 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2021-47124

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
io_uring: fix link timeout refs
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: io_uring: fix link timeout refs WARNING: CPU: 0 PID: 10242 at lib/refcount.c:28 refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 RIP: 0010:refcount_warn_saturate+0x15b/0x1a0 lib/refcount.c:28 Call Trace: __refcount_sub_and_test include/linux/refcount.h:283 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] io_put_req fs/io_uring.c:2140 [inline] io_queue_linked_timeout fs/io_uring.c:6300 [inline] __io_queue_sqe+0xbef/0xec0 fs/io_uring.c:6354 io_submit_sqe fs/io_uring.c:6534 [inline] io_submit_sqes+0x2bbd/0x7c50 fs/io_uring.c:6660 __do_sys_io_uring_enter fs/io_uring.c:9240 [inline] __se_sys_io_uring_enter+0x256/0x1d60 fs/io_uring.c:9182 io_link_timeout_fn() should put only one reference of the linked timeout request, however in case of racing with the master request's completion first io_req_complete() puts one and then io_put_req_deferred() is called.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 io_uring 模块的 io_link_timeout_fn() 方法中存在错误。
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 1c20e9040f49687ba2ccc2ffd4411351a6c2ebff ~ 0b2a990e5d2f76d020cb840c456e6ec5f0c27530 -
Linux Linux 5.12 -

II. Public POCs for CVE-2021-47124

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-47124

请登录查看更多情报信息。

Other References for CVE-2021-47124 (5)

Same Patch Batch · Linux · 2024-03-15 · 26 CVEs total

CVE-2021-47111 8.8 HIGH xen-netback: take a reference to the RX task thread
CVE-2021-47131 8.1 HIGH net/tls: Fix use-after-free after the TLS device goes down and up
CVE-2021-47135 7.8 HIGH mt76: mt7921: fix possible AOOB issue in mt7921_mcu_tx_rate_report
CVE-2021-47112 7.8 HIGH x86/kvm: Teardown PV features on boot CPU as well
CVE-2021-47129 7.8 HIGH netfilter: nft_ct: skip expectations for confirmed conntrack
CVE-2021-47123 7.8 HIGH io_uring: fix ltout double free on completion race
CVE-2021-47126 7.8 HIGH ipv6: Fix KASAN: slab-out-of-bounds Read in fib6_nh_flush_exceptions
CVE-2021-47132 7.5 HIGH mptcp: fix sk_forward_memory corruption on retransmission
CVE-2021-47130 7.5 HIGH nvmet: fix freeing unallocated p2pmem
CVE-2021-47109 7.5 HIGH neighbour: allow NUD_NOARP entries to be forced GCed
CVE-2021-47113 7.1 HIGH btrfs: abort in rename_exchange if we fail to insert the second ref
CVE-2021-47122 net: caif: fix memory leak in caif_device_notify
CVE-2021-47134 efi/fdt: fix panic when no valid fdt found
CVE-2021-47133 HID: amd_sfh: Fix memory leak in amd_sfh_work
CVE-2021-47128 bpf, lockdown, audit: Fix buggy SELinux lockdown permission checks
CVE-2021-47127 ice: track AF_XDP ZC enabled queues in bitmap
CVE-2021-47125 sch_htb: fix refcount leak in htb_parent_to_leaf_offload
CVE-2021-47121 net: caif: fix memory leak in cfusbl_device_notify
CVE-2021-47120 HID: magicmouse: fix NULL-deref on disconnect
CVE-2021-47119 ext4: fix memory leak in ext4_fill_super

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47124

No comments yet

Leave a comment