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In the Linux kernel, the following vulnerability has been resolved:
dm rq: fix double free of blk_mq_tag_set in dev remove after table load fails
When loading a device-mapper table for a request-based mapped device, and the allocation/initialization of the blk_mq_tag_set for the device fails, a following device remove will cause a double free.
E.g. (dmesg): device-mapper: core: Cannot initialize queue for request-based dm-mq mapped device device-mapper: ioctl: unable to set up device queue for new table. Unable to handle kernel pointer dereference in virtual kernel address space Failing address: 0305e098835de000 TEID: 0305e098835de803 Fault in home space mode while using kernel ASCE. AS:000000025efe0007 R3:0000000000000024 Oops: 0038 ilc:3 [#1] SMP Modules linked in: ... lots of modules ... Supported: Yes, External CPU: 0 PID: 7348 Comm: multipathd Kdump: loaded Tainted: G W X 5.3.18-53-default #1 SLE15-SP3 Hardware name: IBM 8561 T01 7I2 (LPAR) Krnl PSW : 0704e00180000000 000000025e368eca (kfree+0x42/0x330) R:0 T:1 IO:1 EX:1 Key:0 M:1 W:0 P:0 AS:3 CC:2 PM:0 RI:0 EA:3 Krnl GPRS: 000000000000004a 000000025efe5230 c1773200d779968d 0000000000000000 000000025e520270 000000025e8d1b40 0000000000000003 00000007aae10000 000000025e5202a2 0000000000000001 c1773200d779968d 0305e098835de640 00000007a8170000 000003ff80138650 000000025e5202a2 000003e00396faa8 Krnl Code: 000000025e368eb8: c4180041e100 lgrl %r1,25eba50b8 000000025e368ebe: ecba06b93a55 risbg %r11,%r10,6,185,58 #000000025e368ec4: e3b010000008 ag %r11,0(%r1) >000000025e368eca: e310b0080004 lg %r1,8(%r11) 000000025e368ed0: a7110001 tmll %r1,1 000000025e368ed4: a7740129 brc 7,25e369126 000000025e368ed8: e320b0080004 lg %r2,8(%r11) 000000025e368ede: b904001b lgr %r1,%r11 Call Trace: [<000000025e368eca>] kfree+0x42/0x330 [<000000025e5202a2>] blk_mq_free_tag_set+0x72/0xb8 [<000003ff801316a8>] dm_mq_cleanup_mapped_device+0x38/0x50 [dm_mod] [<000003ff80120082>] free_dev+0x52/0xd0 [dm_mod] [<000003ff801233f0>] __dm_destroy+0x150/0x1d0 [dm_mod] [<000003ff8012bb9a>] dev_remove+0x162/0x1c0 [dm_mod] [<000003ff8012a988>] ctl_ioctl+0x198/0x478 [dm_mod] [<000003ff8012ac8a>] dm_ctl_ioctl+0x22/0x38 [dm_mod] [<000000025e3b11ee>] ksys_ioctl+0xbe/0xe0 [<000000025e3b127a>] __s390x_sys_ioctl+0x2a/0x40 [<000000025e8c15ac>] system_call+0xd8/0x2c8 Last Breaking-Event-Address: [<000000025e52029c>] blk_mq_free_tag_set+0x6c/0xb8 Kernel panic - not syncing: Fatal exception: panic_on_oops
When allocation/initialization of the blk_mq_tag_set fails in dm_mq_init_request_queue(), it is uninitialized/freed, but the pointer is not reset to NULL; so when dev_remove() later gets into dm_mq_cleanup_mapped_device() it sees the pointer and tries to uninitialize and free it again.
Fix this by setting the pointer to NULL in dm_mq_init_request_queue() error-handling. Also set it to NULL in dm_mq_cleanup_mapped_device().
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade kernel-develUpgrade kernel-tools-develUpgrade kernel-debuginfo-common-aarch64Upgrade kernelUpgrade kernel-debuginfoUpgrade python-perf-debuginfoUpgrade perfUpgrade kernel-headersUpgrade kernel-livepatch-4.14.238-182.421Upgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernel-toolsUpgrade perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade bpftool-debuginfo | Apr 25, 2024 | Feb 27, 2024 |
| Amazon_linux | — | Upgrade kernel | Apr 25, 2024 | Feb 27, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | Feb 27, 2024 |
| Huawei Euleros 2_0_sp8 | — | Upgrade kernel-tools-libsUpgrade kernel-develUpgrade kernelUpgrade kernel-headersUpgrade python3-perfUpgrade bpftoolUpgrade perfUpgrade kernel-toolsUpgrade python-perf | Jul 23, 2024 | Feb 27, 2024 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 27, 2024 |
| Suse | — | Upgrade kernel-default-manUpgrade kernel-default-extraUpgrade kernel-azure-develUpgrade kernel-syms-azureUpgrade kernel-devel-azureUpgrade kernel-sourceUpgrade kernel-obs-buildUpgrade kernel-preemptUpgrade kernel-azureUpgrade kernel-source-azureUpgrade kernel-macrosUpgrade kernel-develUpgrade kernel-64kb-develUpgrade kernel-preempt-develUpgrade reiserfs-kmp-defaultUpgrade kernel-default-develUpgrade kernel-symsUpgrade kernel-64kbUpgrade kernel-defaultUpgrade kernel-default-baseUpgrade kernel-docsUpgrade kernel-azure-baseUpgrade kernel-zfcpdump | Aug 9, 2024 | Feb 27, 2024 |
| Ubuntu | — | Upgrade linux-oracle-5.4Upgrade linuxUpgrade linux-azure-4.15Upgrade linux-gcp-5.4Upgrade linux-awsUpgrade linux-azure-fipsUpgrade linux-azureUpgrade linux-aws-5.4Upgrade linux-raspi-5.4Upgrade linux-gcp-4.15Upgrade linux-raspiUpgrade linux-bluefieldUpgrade linux-gcpUpgrade linux-fipsUpgrade linux-gkeopUpgrade linux-hweUpgrade linux-aws-hweUpgrade linux-oracleUpgrade linux-kvmUpgrade linux-azure-5.4Upgrade linux-hwe-5.4Upgrade linux-gcp-fipsUpgrade linux-aws-fips | Nov 19, 2024 | Feb 27, 2024 |
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