In the Linux kernel, the following vulnerability has been resolved:
xen/netback: avoid entering xenvif_rx_next_skb() with an empty rx queue
xenvif_rx_next_skb() is expecting the rx queue not being empty, but in case the loop in xenvif_rx_action() is doing multiple iterations, the availability of another skb in the rx queue is not being checked.
This can lead to crashes:
[40072.537261] BUG: unable to handle kernel NULL pointer dereference at 0000000000000080 [40072.537407] IP: xenvif_rx_skb+0x23/0x590 [xen_netback] [40072.537534] PGD 0 P4D 0 [40072.537644] Oops: 0000 [#1] SMP NOPTI [40072.537749] CPU: 0 PID: 12505 Comm: v1-c40247-q2-gu Not tainted 4.12.14-122.121-default #1 SLE12-SP5 [40072.537867] Hardware name: HP ProLiant DL580 Gen9/ProLiant DL580 Gen9, BIOS U17 11/23/2021 [40072.537999] task: ffff880433b38100 task.stack: ffffc90043d40000 [40072.538112] RIP: e030:xenvif_rx_skb+0x23/0x590 [xen_netback] [40072.538217] RSP: e02b:ffffc90043d43de0 EFLAGS: 00010246 [40072.538319] RAX: 0000000000000000 RBX: ffffc90043cd7cd0 RCX: 00000000000000f7 [40072.538430] RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffffc90043d43df8 [40072.538531] RBP: 000000000000003f R08: 000077ff80000000 R09: 0000000000000008 [40072.538644] R10: 0000000000007ff0 R11: 00000000000008f6 R12: ffffc90043ce2708 [40072.538745] R13: 0000000000000000 R14: ffffc90043d43ed0 R15: ffff88043ea748c0 [40072.538861] FS: 0000000000000000(0000) GS:ffff880484600000(0000) knlGS:0000000000000000 [40072.538988] CS: e033 DS: 0000 ES: 0000 CR0: 0000000080050033 [40072.539088] CR2: 0000000000000080 CR3: 0000000407ac8000 CR4: 0000000000040660 [40072.539211] Call Trace: [40072.539319] xenvif_rx_action+0x71/0x90 [xen_netback] [40072.539429] xenvif_kthread_guest_rx+0x14a/0x29c [xen_netback]
Fix that by stopping the loop in case the rx queue becomes empty.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfo-common-x86_64Upgrade kernel-livepatch-5.10.135-122.509Upgrade kernel-toolsUpgrade python-perfUpgrade python-perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-livepatch-4.14.290-217.505Upgrade kernel-livepatch-5.15.57-29.131Upgrade bpftoolUpgrade kernel-develUpgrade kernel-debuginfoUpgrade kernelUpgrade perfUpgrade perf-debuginfoUpgrade kernel-headersUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-tools-develUpgrade kernel-tools-debuginfo | May 21, 2025 | Feb 26, 2025 |
| Debian | — | Upgrade linux | Feb 27, 2025 | Feb 27, 2025 |
| Ubuntu | — | Upgrade linux-hwe-5.15Upgrade linux-gcp-5.4Upgrade linux-lowlatencyUpgrade linuxUpgrade linux-azureUpgrade linux-ibm-5.4Upgrade linux-azure-4.15Upgrade linux-iotUpgrade linux-awsUpgrade linux-aws-5.15Upgrade linux-raspiUpgrade linux-aws-5.4Upgrade linux-azure-5.4Upgrade linux-hweUpgrade linux-gcp-fipsUpgrade linux-gcp-4.15Upgrade linux-azure-fipsUpgrade linux-gcpUpgrade linux-oracle-5.4Upgrade linux-aws-fipsUpgrade linux-oracleUpgrade linux-raspi-5.4Upgrade linux-azure-fdeUpgrade linux-azure-5.15Upgrade linux-nvidiaUpgrade linux-aws-hweUpgrade linux-fipsUpgrade linux-lowlatency-hwe-5.15Upgrade linux-intel-iotgUpgrade linux-gcp-5.15Upgrade linux-ibmUpgrade linux-hwe-5.4Upgrade linux-kvmUpgrade linux-gkeopUpgrade linux-intel-iotg-5.15Upgrade linux-oracle-5.15Upgrade linux-riscv-5.15Upgrade linux-realtimeUpgrade linux-bluefieldUpgrade linux-gke | 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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