Medium 5.5Published Sep 4, 2025

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

Updated under an hour ago (Oct 27, 2026, 5:10 PM ET)

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Exploited in the last 30 days

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]

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	5dc615520c4dfb358245680f1904bad61116648e builds before 1a782fa32e644aa9fbae6c8488f3e61221ac96e1; from 5dc615520c4dfb358245680f1904bad61116648e before 17c010fe45def335fe03a0718935416b04c7f349; from 5dc615520c4dfb358245680f1904bad61116648e before f83d469e16bb1f75991ca67c56786fb2aaa42bea; from 5dc615520c4dfb358245680f1904bad61116648e before f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f; from 5dc615520c4dfb358245680f1904bad61116648e before 9262e3e04621558e875eb5afb5e726b648cd5949; from 5dc615520c4dfb358245680f1904bad61116648e before cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
linux linux_kernel linux:linux_kernel	from 6.1 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.43; from 6.13 before 6.15.11; from 6.16 before 6.16.2	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1	patch
https://git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349	patch
https://git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea	patch
https://git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f	patch
https://git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949	patch
https://git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	mailing-list, third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-032379.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.