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In the Linux kernel, the following vulnerability has been resolved:
serial/pmac_zilog: Remove flawed mitigation for rx irq flood
The mitigation was intended to stop the irq completely. That may be better than a hard lock-up but it turns out that you get a crash anyway if you're using pmac_zilog as a serial console:
ttyPZ0: pmz: rx irq flood ! BUG: spinlock recursion on CPU#0, swapper/0
That's because the pr_err() call in pmz_receive_chars() results in pmz_console_write() attempting to lock a spinlock already locked in pmz_interrupt(). With CONFIG_DEBUG_SPINLOCK=y, this produces a fatal BUG splat. The spinlock in question is the one in struct uart_port.
Even when it's not fatal, the serial port rx function ceases to work. Also, the iteration limit doesn't play nicely with QEMU, as can be seen in the bug report linked below.
A web search for other reports of the error message "pmz: rx irq flood" didn't produce anything. So I don't think this code is needed any more. Remove it.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | May 8, 2024 | May 1, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 1, 2024 |
| Suse | — | Upgrade kernel-zfcpdumpUpgrade reiserfs-kmp-64kbUpgrade kernel-kvmsmall-vdsoUpgrade ocfs2-kmp-64kbUpgrade dtb-caviumUpgrade ocfs2-kmp-azureUpgrade gfs2-kmp-64kbUpgrade kernel-default-vdsoUpgrade kernel-debugUpgrade kselftests-kmp-64kbUpgrade kernel-kvmsmall-livepatch-develUpgrade dlm-kmp-64kbUpgrade kernel-source-rtUpgrade dtb-appleUpgrade kernel-rt_debug-develUpgrade dtb-exynosUpgrade kernel-64kb-livepatch-develUpgrade gfs2-kmp-rtUpgrade dtb-alteraUpgrade kernel-default-livepatchUpgrade kernel-docs-htmlUpgrade kernel-kvmsmallUpgrade kernel-obs-buildUpgrade kernel-debug-vdsoUpgrade kernel-source-azureUpgrade kernel-azure-develUpgrade cluster-md-kmp-rtUpgrade kernel-develUpgrade kernel-sourceUpgrade kselftests-kmp-azureUpgrade kernel-devel-azureUpgrade dtb-xilinxUpgrade dtb-broadcomUpgrade gfs2-kmp-azureUpgrade cluster-md-kmp-azureUpgrade kernel-64kbUpgrade kernel-rt-extraUpgrade kernel-64kb-optionalUpgrade kernel-rt-optionalUpgrade kernel-rt-livepatchUpgrade kernel-kvmsmall-develUpgrade kernel-default-optionalUpgrade kernel-syms-azureUpgrade dtb-qcomUpgrade dtb-amazonUpgrade dtb-marvellUpgrade kernel-azure-livepatch-develUpgrade kernel-azure-optionalUpgrade dtb-hisiliconUpgrade gfs2-kmp-defaultUpgrade dtb-lgUpgrade kernel-default-develUpgrade dtb-freescaleUpgrade dtb-allwinnerUpgrade kernel-rtUpgrade kernel-rt-vdsoUpgrade kernel-source-vanillaUpgrade ocfs2-kmp-defaultUpgrade kernel-azureUpgrade kernel-azure-extraUpgrade kernel-rt-develUpgrade dtb-amdUpgrade kernel-default-livepatch-develUpgrade kernel-syms-rtUpgrade kernel-default-extraUpgrade dtb-apmUpgrade dlm-kmp-defaultUpgrade reiserfs-kmp-azureUpgrade dtb-socionextUpgrade dtb-rockchipUpgrade kernel-64kb-extraUpgrade ocfs2-kmp-rtUpgrade kernel-obs-qaUpgrade kernel-devel-rtUpgrade kernel-default-base-rebuildUpgrade dtb-sprdUpgrade dtb-mediatekUpgrade dtb-armUpgrade kernel-rt_debug-vdsoUpgrade kernel-rt-livepatch-develUpgrade kernel-docsUpgrade kernel-debug-livepatch-develUpgrade dtb-amlogicUpgrade dlm-kmp-rtUpgrade kselftests-kmp-defaultUpgrade dtb-renesasUpgrade kernel-default-baseUpgrade dlm-kmp-azureUpgrade kselftests-kmp-rtUpgrade kernel-azure-vdsoUpgrade kernel-debug-develUpgrade reiserfs-kmp-rtUpgrade reiserfs-kmp-defaultUpgrade kernel-symsUpgrade kernel-rt_debug-livepatch-develUpgrade kernel-rt_debugUpgrade kernel-macrosUpgrade cluster-md-kmp-defaultUpgrade cluster-md-kmp-64kbUpgrade kernel-defaultUpgrade kernel-64kb-develUpgrade dtb-nvidia | Jun 13, 2024 | May 1, 2024 |
| Ubuntu | — | Upgrade linux-image-lowlatency-64k-hwe-20.04Upgrade linux-image-5.15.0-1062-kvmUpgrade linux-image-oem-20.04bUpgrade linux-image-5.4.0-1128-awsUpgrade linux-image-genericUpgrade linux-image-raspi-nolpaeUpgrade linux-image-gkeUpgrade linux-image-nvidiaUpgrade linux-image-6.8.0-1009-nvidia-64kUpgrade linux-image-5.15.0-1060-nvidiaUpgrade linux-image-oem-24.04Upgrade linux-image-intel-iotgUpgrade linux-image-nvidia-lowlatencyUpgrade linux-image-5.15.0-1065-gcpUpgrade linux-image-6.8.0-1011-awsUpgrade linux-image-intelUpgrade linux-image-oem-20.04Upgrade linux-image-gkeop-5.15Upgrade linux-image-bluefieldUpgrade linux-image-azure-lts-20.04Upgrade linux-image-gkeopUpgrade linux-image-5.4.0-1088-bluefieldUpgrade linux-image-5.15.0-1060-intel-iotgUpgrade linux-image-6.8.0-38-generic-64kUpgrade linux-image-6.8.0-1010-gcpUpgrade linux-image-5.4.0-1116-kvmUpgrade linux-image-6.8.0-38-lowlatencyUpgrade linux-image-6.8.0-1008-oracle-64kUpgrade linux-image-5.15.0-1035-xilinx-zynqmpUpgrade linux-image-xilinx-zynqmpUpgrade linux-image-azure-lts-22.04Upgrade linux-image-5.15.0-116-lowlatency-64kUpgrade linux-image-lowlatencyUpgrade linux-image-raspiUpgrade linux-image-gcp-lts-22.04Upgrade linux-image-5.4.0-1133-azureUpgrade linux-image-6.8.0-38-lowlatency-64kUpgrade linux-image-azureUpgrade linux-image-5.15.0-1058-raspiUpgrade linux-image-5.4.0-189-lowlatencyUpgrade linux-image-oemUpgrade linux-image-oracle-lts-20.04Upgrade linux-image-gkeop-5.4Upgrade linux-image-snapdragon-hwe-18.04Upgrade linux-image-5.15.0-1063-oracleUpgrade linux-image-oracle-lts-22.04Upgrade linux-image-5.15.0-1068-azureUpgrade linux-image-5.4.0-1112-raspiUpgrade linux-image-generic-64kUpgrade linux-image-generic-lpaeUpgrade linux-image-6.8.0-1009-nvidiaUpgrade linux-image-oracleUpgrade linux-image-6.8.0-1010-azure-fdeUpgrade linux-image-6.8.0-1010-azureUpgrade linux-image-5.15.0-116-lowlatencyUpgrade linux-image-lowlatency-64kUpgrade linux-image-lowlatency-hwe-18.04Upgrade linux-image-5.15.0-116-genericUpgrade linux-image-generic-hwe-24.04Upgrade linux-image-oem-osp1Upgrade linux-image-aws-lts-20.04Upgrade linux-image-6.8.0-1008-ibmUpgrade linux-image-generic-64k-hwe-20.04Upgrade linux-image-generic-hwe-20.04Upgrade linux-image-6.8.0-1007-intelUpgrade linux-image-5.15.0-1062-gkeUpgrade linux-image-5.4.0-1047-xilinx-zynqmpUpgrade linux-image-generic-hwe-18.04Upgrade linux-image-oracle-64kUpgrade linux-image-oem-20.04dUpgrade linux-image-5.15.0-1060-nvidia-lowlatencyUpgrade linux-image-5.4.0-1040-iotUpgrade linux-image-5.15.0-1068-azure-fdeUpgrade linux-image-6.8.0-38-genericUpgrade linux-image-6.8.0-1008-oracleUpgrade linux-image-raspi2Upgrade linux-image-gke-5.15Upgrade linux-image-virtual-hwe-18.04Upgrade linux-image-5.15.0-1064-gcpUpgrade linux-image-gcpUpgrade linux-image-5.4.0-189-genericUpgrade linux-image-5.15.0-116-generic-lpaeUpgrade linux-image-6.8.0-1007-raspiUpgrade linux-image-5.4.0-1127-oracleUpgrade linux-image-gcp-lts-20.04Upgrade linux-image-ibm-lts-24.04Upgrade linux-image-azure-fde-lts-22.04Upgrade linux-image-aws-lts-22.04Upgrade linux-image-5.15.0-1065-awsUpgrade linux-image-ibm-lts-20.04Upgrade linux-image-awsUpgrade linux-image-5.15.0-1058-ibmUpgrade linux-image-azure-fdeUpgrade linux-image-lowlatency-hwe-20.04Upgrade linux-image-virtualUpgrade linux-image-oem-24.04aUpgrade linux-image-5.4.0-189-generic-lpaeUpgrade linux-image-5.4.0-1095-gkeopUpgrade linux-image-virtual-hwe-20.04Upgrade linux-image-5.4.0-1075-ibmUpgrade linux-image-6.8.0-1008-oemUpgrade linux-image-5.15.0-1048-gkeopUpgrade linux-image-kvmUpgrade linux-image-raspi-hwe-18.04Upgrade linux-image-ibm-classicUpgrade linux-image-oem-20.04cUpgrade linux-image-nvidia-64kUpgrade linux-image-virtual-hwe-24.04Upgrade linux-image-generic-lpae-hwe-20.04Upgrade linux-image-6.8.0-1006-gkeUpgrade linux-image-generic-64k-hwe-24.04Upgrade linux-image-ibmUpgrade linux-image-5.4.0-1132-gcpUpgrade linux-image-5.15.0-116-generic-64kUpgrade linux-image-azure-cvm | Jul 12, 2024 | May 1, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | May 1, 2024 |
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