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

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2023-53121— tcp: tcp_make_synack() can be called from process context

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tcp_make_synack在进程上下文中访问每CPU变量时未禁用抢占。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.19% · P8

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 8336886f786fdacbc19b719c1f7ea91eb70706d4< d493d4fe88195a144d6a277a90062a7534ed2192 affected
8336886f786fdacbc19b719c1f7ea91eb70706d4< e23ca307745be3df7fe9762f3e2a7e311a57852e affected
8336886f786fdacbc19b719c1f7ea91eb70706d4< 442aa78ed70188b21ccd8669738448702c0a3281 affected
8336886f786fdacbc19b719c1f7ea91eb70706d4< 77ad58bca0119e8cc3e0e9d91a3f22caa66e4dfa affected
8336886f786fdacbc19b719c1f7ea91eb70706d4< ad07290d63ff6689f50565b02f5b6f34ec15a5ca affected
8336886f786fdacbc19b719c1f7ea91eb70706d4< 9180aa4622a720b433e842b4d3aa34d73eec577a affected
8336886f786fdacbc19b719c1f7ea91eb70706d4< 7613cde8c0c1f02a7ec2e1d536c01b65b135fc1c affected
8336886f786fdacbc19b719c1f7ea91eb70706d4< bced3f7db95ff2e6ca29dc4d1c9751ab5e736a09 affected
… +10 more rows
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2023-53121

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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.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
tcp: tcp_make_synack() can be called from process context
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: tcp: tcp_make_synack() can be called from process context tcp_rtx_synack() now could be called in process context as explained in 0a375c822497 ("tcp: tcp_rtx_synack() can be called from process context"). tcp_rtx_synack() might call tcp_make_synack(), which will touch per-CPU variables with preemption enabled. This causes the following BUG: BUG: using __this_cpu_add() in preemptible [00000000] code: ThriftIO1/5464 caller is tcp_make_synack+0x841/0xac0 Call Trace: <TASK> dump_stack_lvl+0x10d/0x1a0 check_preemption_disabled+0x104/0x110 tcp_make_synack+0x841/0xac0 tcp_v6_send_synack+0x5c/0x450 tcp_rtx_synack+0xeb/0x1f0 inet_rtx_syn_ack+0x34/0x60 tcp_check_req+0x3af/0x9e0 tcp_rcv_state_process+0x59b/0x2030 tcp_v6_do_rcv+0x5f5/0x700 release_sock+0x3a/0xf0 tcp_sendmsg+0x33/0x40 ____sys_sendmsg+0x2f2/0x490 __sys_sendmsg+0x184/0x230 do_syscall_64+0x3d/0x90 Avoid calling __TCP_INC_STATS() with will touch per-cpu variables. Use TCP_INC_STATS() which is safe to be called from context switch.
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tcp_make_synack在进程上下文中访问每CPU变量时未禁用抢占。
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 8336886f786fdacbc19b719c1f7ea91eb70706d4 ~ d493d4fe88195a144d6a277a90062a7534ed2192 -
Linux Linux 3.7 -

II. Public POCs for CVE-2023-53121

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

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2023-53121

请登录查看更多情报信息。

Patches & Fixes for CVE-2023-53121 (8)

Same Patch Batch · Linux · 2025-05-02 · 107 CVEs total

CVE-2023-53116 9.8 CRITICAL nvmet: avoid potential UAF in nvmet_req_complete()
CVE-2023-53083 9.8 CRITICAL nfsd: don't replace page in rq_pages if it's a continuation of last page
CVE-2023-53086 8.8 HIGH wifi: mt76: connac: do not check WED status for non-mmio devices
CVE-2025-37798 7.8 HIGH codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()
CVE-2023-53138 7.8 HIGH net: caif: Fix use-after-free in cfusbl_device_notify()
CVE-2023-53111 7.8 HIGH loop: Fix use-after-free issues
CVE-2023-53107 7.8 HIGH veth: Fix use after free in XDP_REDIRECT
CVE-2023-53102 7.8 HIGH ice: xsk: disable txq irq before flushing hw
CVE-2023-53100 7.8 HIGH ext4: fix WARNING in ext4_update_inline_data
CVE-2023-53094 7.8 HIGH tty: serial: fsl_lpuart: fix race on RX DMA shutdown
CVE-2023-53090 7.8 HIGH drm/amdkfd: Fix an illegal memory access
CVE-2023-53088 7.8 HIGH mptcp: fix UaF in listener shutdown
CVE-2023-53087 7.8 HIGH drm/i915/active: Fix misuse of non-idle barriers as fence trackers
CVE-2023-53084 7.8 HIGH drm/shmem-helper: Remove another errant put in error path
CVE-2023-53080 7.8 HIGH xsk: Add missing overflow check in xdp_umem_reg
CVE-2023-53072 7.8 HIGH mptcp: use the workqueue to destroy unaccepted sockets
CVE-2023-53065 7.8 HIGH perf/core: Fix perf_output_begin parameter is incorrectly invoked in perf_event_bpf_output
CVE-2023-53057 7.8 HIGH Bluetooth: HCI: Fix global-out-of-bounds
CVE-2023-53052 7.8 HIGH cifs: fix use-after-free bug in refresh_cache_worker()
CVE-2023-53046 7.8 HIGH Bluetooth: Fix race condition in hci_cmd_sync_clear

Showing top 20 of 107 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2023-53121

No comments yet

Leave a comment