LoongArch: BPF: Fix jump offset calculation in tailcall

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Summary

CVECVE-2025-38723
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-09-04 16:15:42 UTC
Updated2026-05-12 13:17:02 UTC
DescriptionIn 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]

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: NVD-CWE-noinfo

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5dc615520c4dfb358245680f1904bad61116648e 1a782fa32e644aa9fbae6c8488f3e61221ac96e1 git Not specified
CNA Linux Linux affected 5dc615520c4dfb358245680f1904bad61116648e 17c010fe45def335fe03a0718935416b04c7f349 git Not specified
CNA Linux Linux affected 5dc615520c4dfb358245680f1904bad61116648e f83d469e16bb1f75991ca67c56786fb2aaa42bea git Not specified
CNA Linux Linux affected 5dc615520c4dfb358245680f1904bad61116648e f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f git Not specified
CNA Linux Linux affected 5dc615520c4dfb358245680f1904bad61116648e 9262e3e04621558e875eb5afb5e726b648cd5949 git Not specified
CNA Linux Linux affected 5dc615520c4dfb358245680f1904bad61116648e cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 git Not specified
CNA Linux Linux affected 6.1 Not specified
CNA Linux Linux unaffected 6.1 semver Not specified
CNA Linux Linux unaffected 6.1.149 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.103 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.43 6.12.* semver Not specified
CNA Linux Linux unaffected 6.15.11 6.15.* semver Not specified
CNA Linux Linux unaffected 6.16.2 6.16.* semver Not specified
CNA Linux Linux unaffected 6.17 * original_commit_for_fix Not specified
ADP Siemens SIMATIC CN 4100 affected V5.0 custom Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
lists.debian.org/debian-lts-announce/2025/10/msg00008.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
cert-portal.siemens.com/productcert/html/ssa-032379.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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