Linux KernelOperating system · Linux
CVE-2024-35825
A fix is available.
Upgrade to 4.15 / 4.19.312 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 · uneditedIn the Linux kernel, the following vulnerability has been resolved: usb: gadget: ncm: Fix handling of zero block length packets While connecting to a Linux host with CDC_NCM_NTB_DEF_SIZE_TX set to 65536, it has been observed that we receive short packets, which come at interval of 5-10 seconds sometimes and have block length zero but still contain 1-2 valid datagrams present. According to the NCM spec: "If wBlockLength = 0x0000, the block is terminated by a short packet. In this case, the USB transfer must still be shorter than dwNtbInMaxSize or dwNtbOutMaxSize. If exactly dwNtbInMaxSize or dwNtbOutMaxSize bytes are sent, and the size is a multiple of wMaxPacketSize for the given pipe, then no ZLP shall be sent. wBlockLength= 0x0000 must be used with extreme care, because of the possibility that the host and device may get out of sync, and because of test issues. wBlockLength = 0x0000 allows the sender to reduce latency by starting to send a very large NTB, and then shortening it when the sender discovers that there’s not sufficient data to justify sending a large NTB" However, there is a potential issue with the current implementation, as it checks for the occurrence of multiple NTBs in a single giveback by verifying if the leftover bytes to be processed is zero or not. If the block length reads zero, we would process the same NTB infintely because the leftover bytes is never zero and it leads to a crash. Fix this by bailing out if block length reads zero.
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 analysisA 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:
>= 4.14.328, < 4.15>= 4.19.297, < 4.19.312>= 5.4.259, < 5.4.274>= 5.10.199, < 5.10.215>= 5.15.136, < 5.15.154>= 6.1.59, < 6.1.84>= 6.5.8, < 6.6>= 6.6.1, < 6.6.24>= 6.7, < 6.7.12= 6.6= 6.8
Debian LinuxOperating system
Affected:
= 10.0CVSS 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 4.15 / 4.19.312 / 5.4.274 or later
Fixed in
4.154.19.3125.4.274
Vendor patch
git.kernel.org →
Recommended fix
High confidence
Linux Kernel 5.10.215 (or 5.4.274, 4.19.312, or 4.15 depending on branch)
- Upgrade Linux kernel to a version with the fix: 4.15 or later for the 4.14 branch, 4.19.312 or later for the 4.19 branch, 5.4.274 or later for the 5.4 branch, or 5.10.215 or later for the 5.10 branch
- For Debian 10 (buster), apply the Debian kernel security update that includes this fix
- Reboot the system to load the updated kernel
- Verify the fix is applied by checking that the kernel version matches one of the fixed versions above
- Test USB gadget NCM functionality to confirm the zero block length packet handling no longer causes crashes
Caveat Kernel upgrade requires system reboot; ensure compatibility with existing system configurations before upgrading
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.
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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 sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2024-35825 in production — separate from our analysis above.
Know something about CVE-2024-35825?
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
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What belongs here
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