CVE-2026-97618

Summary

In the Linux kernel, the following vulnerability has been resolved:

io_uring/net: don't overconsume buffers when using MSG_TRUNC

When a recv/recvmsg is issued with MSG_TRUNC and the incoming packet is larger than the provided buffer, the net layer returns the full length of the packet rather than the number of bytes actually copied into the buffer. As a result, io_uring advances more of the provided buffer ring than was actually filled. Use the actual filled region size to consume the buffer, but still return the full size to preserve MSG_TRUNC semantics.

Take care with multishot, because that seems to already truncate the consumption based on the available payload size.

This was reported in https://github.com/axboe/liburing/issues/1619.

[axboe: fold in size_t unsigned fix]

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxae98dbf43d755b4e111fcd086e53939bef3e9a1a < 927d96f91c582b319d104ecf50ec935a8dc29193affected
LinuxLinuxae98dbf43d755b4e111fcd086e53939bef3e9a1a < 2e70ea75c7bb38a6dc212975f887310f14f7c043affected
LinuxLinuxae98dbf43d755b4e111fcd086e53939bef3e9a1a < 6028b543884f8735e057ec9eea4908cd61cab230affected
LinuxLinux6.12affected
LinuxLinux0 < 6.12unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References