CVE-2025-38723 (GCVE-0-2025-38723)

Vulnerability from cvelistv5 – Published: 2025-09-04 15:33 – Updated: 2025-11-03 17:41
VLAI?
Title
LoongArch: BPF: Fix jump offset calculation in tailcall
Summary
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, $zero, -28 # 0x0000004c Before apply this patch, the follow test case will reveal soft lock issues. cd tools/testing/selftests/bpf/ ./test_progs --allow=tailcalls/tailcall_bpf2bpf_1 dmesg: watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 5dc615520c4dfb358245680f1904bad61116648e , < 1a782fa32e644aa9fbae6c8488f3e61221ac96e1 (git)
Affected: 5dc615520c4dfb358245680f1904bad61116648e , < 17c010fe45def335fe03a0718935416b04c7f349 (git)
Affected: 5dc615520c4dfb358245680f1904bad61116648e , < f83d469e16bb1f75991ca67c56786fb2aaa42bea (git)
Affected: 5dc615520c4dfb358245680f1904bad61116648e , < f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f (git)
Affected: 5dc615520c4dfb358245680f1904bad61116648e , < 9262e3e04621558e875eb5afb5e726b648cd5949 (git)
Affected: 5dc615520c4dfb358245680f1904bad61116648e , < cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3 (git)
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    Linux Linux Affected: 6.1
Unaffected: 0 , < 6.1 (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.43 , ≤ 6.12.* (semver)
Unaffected: 6.15.11 , ≤ 6.15.* (semver)
Unaffected: 6.16.2 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Fix jump offset calculation in tailcall\n\nThe extra pass of bpf_int_jit_compile() skips JIT context initialization\nwhich essentially skips offset calculation leaving out_offset = -1, so\nthe jmp_offset in emit_bpf_tail_call is calculated by\n\n\"#define jmp_offset (out_offset - (cur_offset))\"\n\nis a negative number, which is wrong. The final generated assembly are\nas follow.\n\n54:\tbgeu        \t$a2, $t1, -8\t    # 0x0000004c\n58:\taddi.d      \t$a6, $s5, -1\n5c:\tbltz        \t$a6, -16\t    # 0x0000004c\n60:\talsl.d      \t$t2, $a2, $a1, 0x3\n64:\tld.d        \t$t2, $t2, 264\n68:\tbeq         \t$t2, $zero, -28\t    # 0x0000004c\n\nBefore apply this patch, the follow test case will reveal soft lock issues.\n\ncd tools/testing/selftests/bpf/\n./test_progs --allow=tailcalls/tailcall_bpf2bpf_1\n\ndmesg:\nwatchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]"
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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