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
CVSS Details
- CVSS 3.1 Base Score: 5.5
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade python-perf-debuginfoUpgrade kernel-headersUpgrade kernelUpgrade bpftool-debuginfoUpgrade python-perfUpgrade kernel-livepatch-5.15.50-23.125Upgrade kernel-tools-develUpgrade perf-debuginfoUpgrade kernel-tools-debuginfoUpgrade bpftoolUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernel-livepatch-4.14.285-215.501Upgrade kernel-debuginfo-common-aarch64Upgrade kernel-toolsUpgrade kernel-livepatch-5.10.126-117.518Upgrade perf | May 21, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-tools-libsUpgrade kernel-tools-libs-develUpgrade bpftoolUpgrade kernel-toolsUpgrade kernel-develUpgrade perfUpgrade kernel-headersUpgrade kernel | May 13, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp12 | — | Upgrade kernel-toolsUpgrade kernel-tools-libsUpgrade kernel-abi-stablelistsUpgrade kernelUpgrade bpftoolUpgrade python3-perf | Jun 11, 2025 | Feb 26, 2025 |
| Huawei Euleros 2_0_sp13 | — | Upgrade bpftoolUpgrade kernel-tools-libsUpgrade python3-perfUpgrade kernelUpgrade kernel-abi-stablelistsUpgrade kernel-tools | Jun 11, 2025 | Feb 26, 2025 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 26, 2025 |
| Ubuntu | — | Upgrade linux-azureUpgrade linux-raspi-5.4Upgrade linux-oracleUpgrade linux-gkeopUpgrade linux-gcp-5.15Upgrade linux-hwe-5.4Upgrade linux-awsUpgrade linux-intel-iotg-5.15Upgrade linux-iotUpgrade linux-gcp-5.4Upgrade linux-hwe-5.15Upgrade linux-hweUpgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-azure-4.15Upgrade linux-nvidiaUpgrade linux-azure-5.15Upgrade linux-gcp-4.15Upgrade linux-ibmUpgrade linux-azure-fipsUpgrade linux-azure-5.4Upgrade linux-kvmUpgrade linux-realtimeUpgrade linux-aws-5.15Upgrade linux-gkeUpgrade linux-aws-hweUpgrade linux-raspiUpgrade linux-lowlatencyUpgrade linux-aws-5.4Upgrade linux-ibm-5.4Upgrade linuxUpgrade linux-oracle-5.4Upgrade linux-oracle-5.15Upgrade linux-intel-iotgUpgrade linux-fipsUpgrade linux-riscv-5.15Upgrade linux-lowlatency-hwe-5.15Upgrade linux-gcpUpgrade linux-bluefield | 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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