Description
It was found that the net_dma code in tcp_recvmsg() in the 2.6.32 kernel as shipped in RHEL6 is thread-unsafe. So an unprivileged multi-threaded userspace application calling recvmsg() for the same network socket in parallel executed on ioatdma-enabled hardware with net_dma enabled can leak the memory, crash the host leading to a denial-of-service or cause a random memory corruption.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| The Linux Foundation | kernel | 2.6.32 as shipped in rhel-6 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | linux | 3.13.4-1 | — |
| Debian 13 | linux | 3.13.4-1 | — |
| Debian 12 | linux | 3.13.4-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | linux | 3.13.0-40.69 | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP4 | kernel-ec2 +5 | 3.0.101-108.138.1 | SUSE-SU-2023:0416-1 |
Advisories 2
- SUSE-SU-2023:0416-1 Security update for the Linux Kernel SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2023-0406 Linux Kernel: Schwachstelle ermöglicht Denial of Service BSI CERT-Bund (WID) · Feb 15, 2023