In the Linux kernel, the following vulnerability has been resolved:
rxrpc: Fix listen() setting the bar too high for the prealloc rings
AF_RXRPC's listen() handler lets you set the backlog up to 32 (if you bump up the sysctl), but whilst the preallocation circular buffers have 32 slots in them, one of them has to be a dead slot because we're using CIRC_CNT().
This means that listen(rxrpc_sock, 32) will cause an oops when the socket is closed because rxrpc_service_prealloc_one() allocated one too many calls and rxrpc_discard_prealloc() won't then be able to get rid of them because it'll think the ring is empty. rxrpc_release_calls_on_socket() then tries to abort them, but oopses because call->peer isn't yet set.
Fix this by setting the maximum backlog to RXRPC_BACKLOG_MAX - 1 to match the ring capacity.
BUG: kernel NULL pointer dereference, address: 0000000000000086 ... RIP: 0010:rxrpc_send_abort_packet+0x73/0x240 [rxrpc] Call Trace: <TASK> ? __wake_up_common_lock+0x7a/0x90 ? rxrpc_notify_socket+0x8e/0x140 [rxrpc] ? rxrpc_abort_call+0x4c/0x60 [rxrpc] rxrpc_release_calls_on_socket+0x107/0x1a0 [rxrpc] rxrpc_release+0xc9/0x1c0 [rxrpc] __sock_release+0x37/0xa0 sock_close+0x11/0x20 __fput+0x89/0x240 task_work_run+0x59/0x90 do_exit+0x319/0xaa0
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.15.50-23.125Upgrade kernelUpgrade python-perfUpgrade bpftool-debuginfoUpgrade python-perf-debuginfoUpgrade kernel-headersUpgrade kernel-develUpgrade kernel-livepatch-4.14.285-215.501Upgrade perfUpgrade kernel-toolsUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade perf-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade kernel-tools-develUpgrade kernel-livepatch-5.10.126-117.518 | May 21, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade bpftoolUpgrade kernel-tools-libs-develUpgrade kernel-tools-libsUpgrade kernel-develUpgrade perfUpgrade kernel-toolsUpgrade kernelUpgrade kernel-headers | May 13, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade python3-perfUpgrade kernelUpgrade bpftool | Jun 11, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade python3-perfUpgrade bpftoolUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-tools | Jun 11, 2025 | Feb 26, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-fipsUpgrade linux-intel-iotgUpgrade linux-lowlatencyUpgrade linux-gkeUpgrade linux-aws-hweUpgrade linux-ibm-5.4Upgrade linux-riscv-5.15Upgrade linux-aws-5.4Upgrade linux-oracle-5.4Upgrade linux-aws-5.15Upgrade linux-gcpUpgrade linux-lowlatency-hwe-5.15Upgrade linux-bluefieldUpgrade linux-raspiUpgrade linux-oracle-5.15Upgrade linuxUpgrade linux-azure-fipsUpgrade linux-hweUpgrade linux-realtimeUpgrade linux-iotUpgrade linux-raspi-5.4Upgrade linux-awsUpgrade linux-hwe-5.4Upgrade linux-gcp-fipsUpgrade linux-azureUpgrade linux-ibmUpgrade linux-azure-5.15Upgrade linux-hwe-5.15Upgrade linux-nvidiaUpgrade linux-intel-iotg-5.15Upgrade linux-gcp-5.15Upgrade linux-gcp-5.4Upgrade linux-oracleUpgrade linux-azure-5.4Upgrade linux-aws-fipsUpgrade linux-kvmUpgrade linux-gcp-4.15Upgrade linux-gkeopUpgrade linux-azure-4.15 | Mar 3, 2025 | Feb 26, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Feb 26, 2025 |
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