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In the Linux kernel, the following vulnerability has been resolved:
dm: fix mempool NULL pointer race when completing IO
dm_io_dec_pending() calls end_io_acct() first and will then dec md in-flight pending count. But if a task is swapping DM table at same time this can result in a crash due to mempool->elements being NULL:
task1 task2 do_resume ->do_suspend ->dm_wait_for_completion bio_endio ->clone_endio ->dm_io_dec_pending ->end_io_acct ->wakeup task1 ->dm_swap_table ->__bind ->__bind_mempools ->bioset_exit ->mempool_exit ->free_io
[ 67.330330] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 ...... [ 67.330494] pstate: 80400085 (Nzcv daIf +PAN -UAO) [ 67.330510] pc : mempool_free+0x70/0xa0 [ 67.330515] lr : mempool_free+0x4c/0xa0 [ 67.330520] sp : ffffff8008013b20 [ 67.330524] x29: ffffff8008013b20 x28: 0000000000000004 [ 67.330530] x27: ffffffa8c2ff40a0 x26: 00000000ffff1cc8 [ 67.330535] x25: 0000000000000000 x24: ffffffdada34c800 [ 67.330541] x23: 0000000000000000 x22: ffffffdada34c800 [ 67.330547] x21: 00000000ffff1cc8 x20: ffffffd9a1304d80 [ 67.330552] x19: ffffffdada34c970 x18: 000000b312625d9c [ 67.330558] x17: 00000000002dcfbf x16: 00000000000006dd [ 67.330563] x15: 000000000093b41e x14: 0000000000000010 [ 67.330569] x13: 0000000000007f7a x12: 0000000034155555 [ 67.330574] x11: 0000000000000001 x10: 0000000000000001 [ 67.330579] x9 : 0000000000000000 x8 : 0000000000000000 [ 67.330585] x7 : 0000000000000000 x6 : ffffff80148b5c1a [ 67.330590] x5 : ffffff8008013ae0 x4 : 0000000000000001 [ 67.330596] x3 : ffffff80080139c8 x2 : ffffff801083bab8 [ 67.330601] x1 : 0000000000000000 x0 : ffffffdada34c970 [ 67.330609] Call trace: [ 67.330616] mempool_free+0x70/0xa0 [ 67.330627] bio_put+0xf8/0x110 [ 67.330638] dec_pending+0x13c/0x230 [ 67.330644] clone_endio+0x90/0x180 [ 67.330649] bio_endio+0x198/0x1b8 [ 67.330655] dec_pending+0x190/0x230 [ 67.330660] clone_endio+0x90/0x180 [ 67.330665] bio_endio+0x198/0x1b8 [ 67.330673] blk_update_request+0x214/0x428 [ 67.330683] scsi_end_request+0x2c/0x300 [ 67.330688] scsi_io_completion+0xa0/0x710 [ 67.330695] scsi_finish_command+0xd8/0x110 [ 67.330700] scsi_softirq_done+0x114/0x148 [ 67.330708] blk_done_softirq+0x74/0xd0 [ 67.330716] __do_softirq+0x18c/0x374 [ 67.330724] irq_exit+0xb4/0xb8 [ 67.330732] __handle_domain_irq+0x84/0xc0 [ 67.330737] gic_handle_irq+0x148/0x1b0 [ 67.330744] el1_irq+0xe8/0x190 [ 67.330753] lpm_cpuidle_enter+0x4f8/0x538 [ 67.330759] cpuidle_enter_state+0x1fc/0x398 [ 67.330764] cpuidle_enter+0x18/0x20 [ 67.330772] do_idle+0x1b4/0x290 [ 67.330778] cpu_startup_entry+0x20/0x28 [ 67.330786] secondary_start_kernel+0x160/0x170
Fix this by: 1) Establishing pointers to 'struct dm_io' members in dm_io_dec_pending() so that they may be passed into end_io_acct() _after_ free_io() is called. 2) Moving end_io_acct() after free_io().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade python-perf-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-livepatch-5.10.118-111.515Upgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-toolsUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-develUpgrade perfUpgrade kernelUpgrade kernel-tools-develUpgrade kernel-tools-debuginfoUpgrade perf-debuginfoUpgrade bpftoolUpgrade kernel-debuginfoUpgrade kernel-headersUpgrade kernel-livepatch-4.14.281-212.502 | May 21, 2025 | May 22, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 22, 2024 |
| Huawei Euleros 2_0_sp10 | — | Upgrade kernel-abi-stablelistsUpgrade kernelUpgrade kernel-toolsUpgrade python3-perfUpgrade kernel-tools-libs | Oct 8, 2024 | May 22, 2024 |
| Huawei Euleros 2_0_sp9 | — | Upgrade python3-perfUpgrade kernelUpgrade kernel-toolsUpgrade kernel-tools-libs | Oct 8, 2024 | May 22, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | May 22, 2024 |
| Suse | — | Upgrade kselftests-kmp-defaultUpgrade kernel-64kbUpgrade kernel-debugUpgrade ocfs2-kmp-rtUpgrade kernel-devel-rtUpgrade gfs2-kmp-64kbUpgrade gfs2-kmp-rtUpgrade dtb-amazonUpgrade kernel-sourceUpgrade dtb-mediatekUpgrade dlm-kmp-64kbUpgrade kernel-64kb-livepatch-develUpgrade kernel-default-manUpgrade kernel-rt-develUpgrade kernel-source-azureUpgrade kernel-preemptUpgrade kernel-kvmsmall-livepatch-develUpgrade kernel-symsUpgrade kselftests-kmp-64kbUpgrade kernel-kvmsmall-develUpgrade kernel-azure-develUpgrade kernel-default-extraUpgrade kernel-rt_debug-vdsoUpgrade kernel-64kb-develUpgrade kernel-azure-extraUpgrade kernel-debug-livepatch-develUpgrade kernel-obs-qaUpgrade kernel-zfcpdumpUpgrade kernel-azure-vdsoUpgrade cluster-md-kmp-defaultUpgrade dtb-lgUpgrade kernel-azure-livepatch-develUpgrade kernel-macrosUpgrade kernel-rt_debugUpgrade dtb-qcomUpgrade dtb-hisiliconUpgrade kernel-devel-azureUpgrade cluster-md-kmp-azureUpgrade kernel-default-develUpgrade kernel-rt-livepatch-develUpgrade dtb-freescaleUpgrade dtb-exynosUpgrade kernel-64kb-optionalUpgrade dtb-amlogicUpgrade dtb-apmUpgrade kernel-kvmsmallUpgrade dlm-kmp-azureUpgrade kernel-syms-rtUpgrade dtb-armUpgrade kernel-rtUpgrade dtb-appleUpgrade kernel-syms-azureUpgrade kernel-azure-baseUpgrade reiserfs-kmp-64kbUpgrade kernel-defaultUpgrade gfs2-kmp-azureUpgrade kernel-source-rtUpgrade kernel-develUpgrade dtb-allwinnerUpgrade dtb-renesasUpgrade kernel-debug-develUpgrade reiserfs-kmp-azureUpgrade dtb-socionextUpgrade kernel-debug-vdsoUpgrade kernel-docsUpgrade kernel-default-livepatchUpgrade dtb-caviumUpgrade kernel-64kb-extraUpgrade dtb-broadcomUpgrade kernel-docs-htmlUpgrade kselftests-kmp-azureUpgrade kernel-default-base-rebuildUpgrade dtb-marvellUpgrade dtb-rockchipUpgrade dtb-sprdUpgrade kernel-source-vanillaUpgrade ocfs2-kmp-defaultUpgrade dtb-xilinxUpgrade kernel-default-optionalUpgrade kernel-default-baseUpgrade kernel-rt-livepatchUpgrade kernel-preempt-develUpgrade dtb-amdUpgrade dtb-nvidiaUpgrade kernel-rt-vdsoUpgrade kselftests-kmp-rtUpgrade kernel-default-livepatch-develUpgrade kernel-kvmsmall-vdsoUpgrade kernel-default-vdsoUpgrade gfs2-kmp-defaultUpgrade dlm-kmp-rtUpgrade kernel-rt-optionalUpgrade reiserfs-kmp-defaultUpgrade reiserfs-kmp-rtUpgrade ocfs2-kmp-64kbUpgrade dlm-kmp-defaultUpgrade kernel-rt_debug-livepatch-develUpgrade dtb-alteraUpgrade kernel-rt-extraUpgrade kernel-obs-buildUpgrade kernel-azure-optionalUpgrade kernel-azureUpgrade cluster-md-kmp-64kbUpgrade cluster-md-kmp-rtUpgrade kernel-rt_debug-develUpgrade ocfs2-kmp-azure | Aug 9, 2024 | May 22, 2024 |
| Ubuntu | — | Upgrade linux-hweUpgrade linux-azure-4.15Upgrade linux-ibm-5.4Upgrade linux-gcp-4.15Upgrade linux-gcpUpgrade linux-gkeopUpgrade linuxUpgrade linux-ibmUpgrade linux-hwe-5.4Upgrade linux-gcp-5.4Upgrade linux-aws-hweUpgrade linux-oracleUpgrade linux-azure-fipsUpgrade linux-azure-fde-5.15Upgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-awsUpgrade linux-kvmUpgrade linux-bluefieldUpgrade linux-iotUpgrade linux-raspi-5.4Upgrade linux-aws-5.4Upgrade linux-fipsUpgrade linux-azureUpgrade linux-azure-5.4Upgrade linux-raspiUpgrade linux-oracle-5.4 | Nov 19, 2024 | May 22, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | May 22, 2024 |
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