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CVE-2025-38723
LoongArch: BPF: Fix jump offset calculation in tailcall
Description

In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix jump offset calculation in tailcall The extra pass of bpf_int_jit_compile() skips JIT context initialization which essentially skips offset calculation leaving out_offset = -1, so the jmp_offset in emit_bpf_tail_call is calculated by "#define jmp_offset (out_offset - (cur_offset))" is a negative number, which is wrong. The final generated assembly are as follow. 54: bgeu $a2, $t1, -8 # 0x0000004c 58: addi.d $a6, $s5, -1 5c: bltz $a6, -16 # 0x0000004c 60: alsl.d $t2, $a2, $a1, 0x3 64: ld.d $t2, $t2, 264 68: beq $t2, $zero, -28 # 0x0000004c Before apply this patch, the follow test case will reveal soft lock issues. cd tools/testing/selftests/bpf/ ./test_progs --allow=tailcalls/tailcall_bpf2bpf_1 dmesg: watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]

INFO

Published Date :

Sept. 4, 2025, 4:15 p.m.

Last Modified :

Sept. 5, 2025, 5:47 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products

The following products are affected by CVE-2025-38723 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Solution
Apply the Linux kernel patch to fix BPF tail call jump offset calculation issues.
  • Update the Linux kernel to the latest version.
  • Apply the specific patch for LoongArch BPF tailcall offset.
  • Verify the fix with the provided test case.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2025-38723.

URL Resource
https://git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349
https://git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1
https://git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949
https://git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3
https://git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f
https://git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2025-38723 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2025-38723 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2025-38723 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2025-38723 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Sep. 04, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix jump offset calculation in tailcall The extra pass of bpf_int_jit_compile() skips JIT context initialization which essentially skips offset calculation leaving out_offset = -1, so the jmp_offset in emit_bpf_tail_call is calculated by "#define jmp_offset (out_offset - (cur_offset))" is a negative number, which is wrong. The final generated assembly are as follow. 54: bgeu $a2, $t1, -8 # 0x0000004c 58: addi.d $a6, $s5, -1 5c: bltz $a6, -16 # 0x0000004c 60: alsl.d $t2, $a2, $a1, 0x3 64: ld.d $t2, $t2, 264 68: beq $t2, $zero, -28 # 0x0000004c Before apply this patch, the follow test case will reveal soft lock issues. cd tools/testing/selftests/bpf/ ./test_progs --allow=tailcalls/tailcall_bpf2bpf_1 dmesg: watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]
    Added Reference https://git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349
    Added Reference https://git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1
    Added Reference https://git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949
    Added Reference https://git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3
    Added Reference https://git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f
    Added Reference https://git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
No CVSS metrics available for this vulnerability.