What’s Vulnerable › Vulnerabilities

CVE-2023-53716: net: fix skb leak in __skb_tstamp_tx()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-22 · updated 2026-10-28

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.

Affected products

• Linux kernel: from 6.2.15 before 6.3; from 4.14.315 before 4.14.316; from 4.19.283 before 4.19.284; from 5.4.243 before 5.4.244; from 5.10.180 before 5.10.181; from 5.15.111 before 5.15.114 — fixed in 4.14.316, 4.19.284, 5.10.181, 5.15.114, 5.4.244, 6.1.31

How to fix

Upgrade to a fixed version: Linux kernel 4.14.316, 4.19.284, 5.10.181, 5.15.114. Check the vendor advisory for mitigations.

References

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

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