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Linux KernelOperating system · Linux

CVE-2025-37893

MEDIUM · 5.5 CVSS v3.1 Published 2025-04-18
Fix available
A fix is available. Upgrade to 6.1.134 / 6.6.87 or later.
See remediation →
57/100
Remediation priority · Elevated
Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
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.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Linux KernelOperating system
Affected:>= 6.1, < 6.1.134>= 6.2, < 6.6.87>= 6.7, < 6.12.23>= 6.13, < 6.13.11>= 6.14, < 6.14.2

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Local
Complexity
Low
Privileges
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

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 6.1.134 / 6.6.87 / 6.12.23 or later
Fixed in 6.1.1346.6.876.12.23
Vendor patch git.kernel.org →
Recommended fix High confidence

6.1.134, 6.6.87, 6.12.23, or 6.13.11 (depending on your base branch)

  1. Identify the current running kernel version using 'uname -r'
  2. Download the kernel source code for your current version from kernel.org
  3. Fetch the specific commit fix: git fetch https://git.kernel.org/stable/c/205a2182c51ffebaef54d643e3745e720cded08b
  4. Apply the patch using 'git cherry-pick 205a2182c51ffebaef54d643e3745e720cded08b' or 'git am' with the patch file
  5. Rebuild the Linux kernel with the fix applied
  6. Reboot the system using the patched kernel
Caveat Kernel rebuild required; ensure bootloader is configured correctly for the new kernel

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-37893 in production — separate from our analysis above.

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What this is

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What belongs here
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  • Version or environment caveats, and links to real fixes
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