In the Linux kernel, the following vulnerability has been resolved:
s390/qeth: fix NULL deref in qeth_clear_working_pool_list()
When qeth_set_online() calls qeth_clear_working_pool_list() to roll back after an error exit from qeth_hardsetup_card(), we are at risk of accessing card->qdio.in_q before it was allocated by qeth_alloc_qdio_queues() via qeth_mpc_initialize().
qeth_clear_working_pool_list() then dereferences NULL, and by writing to queue->bufs[i].pool_entry scribbles all over the CPU's lowcore. Resulting in a crash when those lowcore areas are used next (eg. on the next machine-check interrupt).
Such a scenario would typically happen when the device is first set online and its queues aren't allocated yet. An early IO error or certain misconfigs (eg. mismatched transport mode, bad portno) then cause us to error out from qeth_hardsetup_card() with card->qdio.in_q still being NULL.
Fix it by checking the pointer for NULL before accessing it.
Note that we also have (rare) paths inside qeth_mpc_initialize() where a configuration change can cause us to free the existing queues, expecting that subsequent code will allocate them again. If we then error out before that re-allocation happens, the same bug occurs.
Root-caused-by: Heiko Carstens <[email protected]>
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 |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Suse | — | Upgrade ocfs2-kmp-64kbUpgrade kernel-zfcpdumpUpgrade kselftests-kmp-azureUpgrade kernel-rt_debugUpgrade kernel-azure-livepatch-develUpgrade gfs2-kmp-azureUpgrade kernel-rt-optionalUpgrade kernel-obs-buildUpgrade kernel-source-azureUpgrade kernel-debug-develUpgrade dtb-lgUpgrade kernel-sourceUpgrade kernel-docs-htmlUpgrade kernel-azureUpgrade kernel-default-vdsoUpgrade dtb-hisiliconUpgrade dtb-broadcomUpgrade dtb-alteraUpgrade kernel-64kb-livepatch-develUpgrade dtb-renesasUpgrade dtb-exynosUpgrade ocfs2-kmp-azureUpgrade kernel-preempt-develUpgrade dtb-marvellUpgrade kernel-azure-baseUpgrade kernel-rt-vdsoUpgrade reiserfs-kmp-64kbUpgrade gfs2-kmp-64kbUpgrade dtb-freescaleUpgrade kernel-default-develUpgrade kernel-64kb-optionalUpgrade kernel-rt_debug-develUpgrade kernel-kvmsmall-vdsoUpgrade kernel-default-livepatchUpgrade kernel-azure-optionalUpgrade kernel-source-vanillaUpgrade gfs2-kmp-defaultUpgrade dtb-caviumUpgrade ocfs2-kmp-defaultUpgrade kernel-devel-azureUpgrade gfs2-kmp-rtUpgrade kselftests-kmp-64kbUpgrade dlm-kmp-64kbUpgrade dtb-allwinnerUpgrade kernel-64kbUpgrade dtb-amdUpgrade kernel-debug-vdsoUpgrade kernel-rt-extraUpgrade kernel-source-rtUpgrade kernel-kvmsmall-livepatch-develUpgrade cluster-md-kmp-azureUpgrade dtb-amazonUpgrade kernel-syms-azureUpgrade dtb-appleUpgrade kernel-debugUpgrade kernel-kvmsmallUpgrade kernel-azure-extraUpgrade kernel-kvmsmall-develUpgrade reiserfs-kmp-defaultUpgrade dtb-mediatekUpgrade kernel-develUpgrade kernel-rt-livepatch-develUpgrade dtb-socionextUpgrade cluster-md-kmp-64kbUpgrade dtb-amlogicUpgrade dtb-xilinxUpgrade dtb-nvidiaUpgrade kernel-obs-qaUpgrade dlm-kmp-azureUpgrade dtb-qcomUpgrade reiserfs-kmp-azureUpgrade kernel-rt_debug-vdsoUpgrade kernel-64kb-extraUpgrade dlm-kmp-defaultUpgrade kernel-default-manUpgrade kselftests-kmp-defaultUpgrade kernel-devel-rtUpgrade dtb-sprdUpgrade kernel-defaultUpgrade dtb-apmUpgrade kernel-default-extraUpgrade ocfs2-kmp-rtUpgrade kernel-syms-rtUpgrade kernel-default-livepatch-develUpgrade kernel-rtUpgrade reiserfs-kmp-rtUpgrade dlm-kmp-rtUpgrade kernel-64kb-develUpgrade kernel-macrosUpgrade kernel-rt-develUpgrade kselftests-kmp-rtUpgrade kernel-debug-livepatch-develUpgrade kernel-azure-develUpgrade kernel-azure-vdsoUpgrade kernel-default-baseUpgrade kernel-default-base-rebuildUpgrade dtb-armUpgrade kernel-docsUpgrade kernel-preemptUpgrade cluster-md-kmp-rtUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-rockchipUpgrade cluster-md-kmp-defaultUpgrade kernel-default-optionalUpgrade kernel-rt-livepatchUpgrade kernel-syms | Aug 9, 2024 | May 21, 2024 |
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