Linux KernelOperating system · Linux
CVE-2024-35910
A fix is available.
Upgrade to 4.19.312 / 5.4.274 or later.
See remediation →
60/100
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: tcp: properly terminate timers for kernel sockets We had various syzbot reports about tcp timers firing after the corresponding netns has been dismantled. Fortunately Josef Bacik could trigger the issue more often, and could test a patch I wrote two years ago. When TCP sockets are closed, we call inet_csk_clear_xmit_timers() to 'stop' the timers. inet_csk_clear_xmit_timers() can be called from any context, including when socket lock is held. This is the reason it uses sk_stop_timer(), aka del_timer(). This means that ongoing timers might finish much later. For user sockets, this is fine because each running timer holds a reference on the socket, and the user socket holds a reference on the netns. For kernel sockets, we risk that the netns is freed before timer can complete, because kernel sockets do not hold reference on the netns. This patch adds inet_csk_clear_xmit_timers_sync() function that using sk_stop_timer_sync() to make sure all timers are terminated before the kernel socket is released. Modules using kernel sockets close them in their netns exit() handler. Also add sock_not_owned_by_me() helper to get LOCKDEP support : inet_csk_clear_xmit_timers_sync() must not be called while socket lock is held. It is very possible we can revert in the future commit 3a58f13a881e ("net: rds: acquire refcount on TCP sockets") which attempted to solve the issue in rds only. (net/smc/af_smc.c and net/mptcp/subflow.c have similar code) We probably can remove the check_net() tests from tcp_out_of_resources() and __tcp_close() in the future.
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:
>= 4.2, < 4.19.312>= 4.20, < 5.4.274>= 5.5, < 5.10.215>= 5.11, < 5.15.154>= 5.16, < 6.1.85>= 6.2, < 6.6.26>= 6.7, < 6.8.5= 6.9
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
- High
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- High
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:L/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 4.19.312 / 5.4.274 / 5.10.215 or later
Fixed in
4.19.3125.4.2745.10.215
Vendor patch
git.kernel.org →
Recommended fix
High confidence
Upgrade to Linux kernel >= 4.19.312, >= 5.4.274, >= 5.10.215, or >= 5.15.154 depending on your current branch; for Debian 10.0 upgrade to a newer Debian release or apply the backported patch
- 1. Identify the currently running kernel version using `uname -r`
- 2. Determine which version branch the current kernel belongs to (e.g., 4.19.x, 5.4.x, 5.10.x, or 5.15.x)
- 3. Upgrade the Linux kernel to the minimum fixed version for that branch: for 4.19.x upgrade to >= 4.19.312, for 5.4.x upgrade to >= 5.4.274, for 5.10.x upgrade to >= 5.10.215, for 5.15.x upgrade to >= 5.15.154
- 4. For Debian 10.0 systems, apply the vendor patch from commit 151c9c724d05d5b0dd8acd3e11cb69ef1f2dbada or upgrade to a newer Debian release with the fixed kernel
- 5. Reboot the system to load the updated kernel
- 6. Verify the fix is applied by checking the kernel version and confirming timer handling code includes inet_csk_clear_xmit_timers_sync()
Caveat Kernel upgrades may require system reboot and could introduce compatibility issues with third-party kernel modules or proprietary drivers
Generated from the published advisory — verify against the referenced sources before acting.
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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-2024-35910 in production — separate from our analysis above.
Know something about CVE-2024-35910?
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
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