Linux Kernel espintcp skb Leak via Async Crypto
CVE-2026-31518 Published on April 22, 2026
esp: fix skb leak with espintcp and async crypto
In the Linux kernel, the following vulnerability has been resolved:
esp: fix skb leak with espintcp and async crypto
When the TX queue for espintcp is full, esp_output_tail_tcp will
return an error and not free the skb, because with synchronous crypto,
the common xfrm output code will drop the packet for us.
With async crypto (esp_output_done), we need to drop the skb when
esp_output_tail_tcp returns an error.
Products Associated with CVE-2026-31518
Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.
Affected Versions
Linux:- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below aca3ad0c262f54a5b5c95dda80a48365997d1224 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 41aafca57de4a4c026701622bd4648f112a9edcd is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 4820847e036ff1035b01b69ad68dfc17e7028fe9 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 6a3ec6efbc4f90e0ccb2e71574f07351f19996f4 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below df6f995358dc1f3c42484f5cfe241d7bd3e1cd15 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 88d386243ed374ac969dabd3bbc1409a31d81818 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 6aa9841d917532d0f2d932d1ff2f3a94305aaf47 is affected.
- Version e27cca96cd68fa2c6814c90f9a1cfd36bb68c593 and below 0c0eef8ccd2413b0a10eb6bbd3442333b1e64dd2 is affected.
- Version 5.6 is affected.
- Before 5.6 is unaffected.
- Version 5.10.253, <= 5.10.* is unaffected.
- Version 5.15.203, <= 5.15.* is unaffected.
- Version 6.1.168, <= 6.1.* is unaffected.
- Version 6.6.131, <= 6.6.* is unaffected.
- Version 6.12.80, <= 6.12.* is unaffected.
- Version 6.18.21, <= 6.18.* is unaffected.
- Version 6.19.11, <= 6.19.* is unaffected.
- Version 7.0, <= * is unaffected.