CVE-2025-38723
Estado: ModificadaMedia (5.5)—
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, $zero, -28 # 0x0000004c
Leer descripción completaMostrar menos
Before apply this patch, the follow test case will reveal soft lock issues.
cd tools/testing/selftests/bpf/ ./test_progs --allow=tailcalls/tailcall_bpf2bpf_1
dmesg: watchdog: BUG: soft lockup - CPU#2 stuck for 26s! [test_progs:25056]
CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 5
- Fecha de la puntuación: 5/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
Tecnologías afectadas (2)
CWE
- NVD-CWE-noinfo
Referencias
- https://git.kernel.org/stable/c/17c010fe45def335fe03a0718935416b04c7f349
- https://git.kernel.org/stable/c/1a782fa32e644aa9fbae6c8488f3e61221ac96e1
- https://git.kernel.org/stable/c/9262e3e04621558e875eb5afb5e726b648cd5949
- https://git.kernel.org/stable/c/cd39d9e6b7e4c58fa77783e7aedf7ada51d02ea3
- https://git.kernel.org/stable/c/f2b5e50cc04d7a049b385bc1c93b9cbf5f10c94f
- https://git.kernel.org/stable/c/f83d469e16bb1f75991ca67c56786fb2aaa42bea
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: BPF: Fix jump offset calculation in tailcall\n\nThe extra pass of bpf_int_jit_compile() skips JIT context initialization\nwhich essentially skips offset calculation leaving out_offset = -1, so\nthe jmp_offset in emit_bpf_tail_call is calculated by\n\n\"#define jmp_offset (out_offset - (cur_offset))\"\n\nis a negative number, which is wrong. The final generated assembly are\nas follow.\n\n54:\tbgeu \t$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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