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CVE-2025-37893— LoongArch: BPF: Fix off-by-one error in build_prologue()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于LoongArch架构BPF的build_prologue函数存在差一错误。

CVSS 7.8 · High EPSS 0.28% · P19

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux 5dc615520c4dfb358245680f1904bad61116648e< b3ffad2f02db4aace6799fe0049508b8925eae45 affected
5dc615520c4dfb358245680f1904bad61116648e< 205a2182c51ffebaef54d643e3745e720cded08b affected
5dc615520c4dfb358245680f1904bad61116648e< c74d95a5679741ef428974ab788f5b0758dc78ae affected
5dc615520c4dfb358245680f1904bad61116648e< 48b904de2408af5f936f0e03f48dfcddeab58aa0 affected
5dc615520c4dfb358245680f1904bad61116648e< 7e2586991e36663c9bc48c828b83eab180ad30a9 affected
6.1 affected
< 6.1 unaffected
6.6.87≤ 6.6.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-37893

Vulnerability Information
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Vulnerability Title
LoongArch: BPF: Fix off-by-one error in build_prologue()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: LoongArch: BPF: Fix off-by-one error in build_prologue() Vincent reported that running BPF progs with tailcalls on LoongArch causes kernel hard lockup. Debugging the issues shows that the JITed image missing a jirl instruction at the end of the epilogue. There are two passes in JIT compiling, the first pass set the flags and the second pass generates JIT code based on those flags. With BPF progs mixing bpf2bpf and tailcalls, build_prologue() generates N insns in the first pass and then generates N+1 insns in the second pass. This makes epilogue_offset off by one and we will jump to some unexpected insn and cause lockup. Fix this by inserting a nop insn.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于LoongArch架构BPF的build_prologue函数存在差一错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5dc615520c4dfb358245680f1904bad61116648e ~ b3ffad2f02db4aace6799fe0049508b8925eae45 -
Linux Linux 6.1 -

II. Public POCs for CVE-2025-37893

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III. Intelligence Information for CVE-2025-37893

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Patches & Fixes for CVE-2025-37893 (1)

Other References for CVE-2025-37893 (5)

Same Patch Batch · Linux · 2025-04-18 · 23 CVEs total

CVE-2025-39930 8.4 HIGH ASoC: simple-card-utils: Don't use __free(device_node) at graph_util_parse_dai()
CVE-2025-40364 7.8 HIGH io_uring: fix io_req_prep_async with provided buffers
CVE-2025-37785 7.8 HIGH ext4: fix OOB read when checking dotdot dir
CVE-2025-37838 7.8 HIGH HSI: ssi_protocol: Fix use after free vulnerability in ssi_protocol Driver Due to Race Con
CVE-2025-39688 7.5 HIGH nfsd: allow SC_STATUS_FREEABLE when searching via nfs4_lookup_stateid()
CVE-2025-39735 7.1 HIGH jfs: fix slab-out-of-bounds read in ea_get()
CVE-2025-38575 ksmbd: use aead_request_free to match aead_request_alloc
CVE-2025-40014 objtool, spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq()
CVE-2025-37860 sfc: fix NULL dereferences in ef100_process_design_param()
CVE-2025-37925 jfs: reject on-disk inodes of an unsupported type
CVE-2025-38049 x86/resctrl: Fix allocation of cleanest CLOSID on platforms with no monitors
CVE-2025-38104 drm/amdgpu: Replace Mutex with Spinlock for RLCG register access to avoid Priority Inversi
CVE-2025-38152 remoteproc: core: Clear table_sz when rproc_shutdown
CVE-2025-38240 drm/mediatek: dp: drm_err => dev_err in HPD path to avoid NULL ptr
CVE-2025-38479 dmaengine: fsl-edma: free irq correctly in remove path
CVE-2025-39989 x86/mce: use is_copy_from_user() to determine copy-from-user context
CVE-2025-40114 iio: light: Add check for array bounds in veml6075_read_int_time_ms
CVE-2025-38637 net_sched: skbprio: Remove overly strict queue assertions
CVE-2025-39728 clk: samsung: Fix UBSAN panic in samsung_clk_init()
CVE-2025-39755 staging: gpib: Fix cb7210 pcmcia Oops

Showing top 20 of 23 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37893

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