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CVE-2022-50530— blk-mq: fix null pointer dereference in blk_mq_clear_rq_mapping()

EPSS 0.02% · P6

Affected Version Matrix 6

VendorProductVersion RangeStatus
LinuxLinux63064be150e4b1ba1e4af594ef5aa81adf21a52d< 6a440e6d04431e774dc084abe88c106e2a474c1aaffected
63064be150e4b1ba1e4af594ef5aa81adf21a52d< 76dd298094f484c6250ebd076fa53287477b2328affected
5.16affected
< 5.16unaffected
6.0.6≤ 6.0.*unaffected
6.1≤ *unaffected
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I. Basic Information for CVE-2022-50530

Vulnerability Information
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Vulnerability Title
blk-mq: fix null pointer dereference in blk_mq_clear_rq_mapping()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: blk-mq: fix null pointer dereference in blk_mq_clear_rq_mapping() Our syzkaller report a null pointer dereference, root cause is following: __blk_mq_alloc_map_and_rqs set->tags[hctx_idx] = blk_mq_alloc_map_and_rqs blk_mq_alloc_map_and_rqs blk_mq_alloc_rqs // failed due to oom alloc_pages_node // set->tags[hctx_idx] is still NULL blk_mq_free_rqs drv_tags = set->tags[hctx_idx]; // null pointer dereference is triggered blk_mq_clear_rq_mapping(drv_tags, ...) This is because commit 63064be150e4 ("blk-mq: Add blk_mq_alloc_map_and_rqs()") merged the two steps: 1) set->tags[hctx_idx] = blk_mq_alloc_rq_map() 2) blk_mq_alloc_rqs(..., set->tags[hctx_idx]) into one step: set->tags[hctx_idx] = blk_mq_alloc_map_and_rqs() Since tags is not initialized yet in this case, fix the problem by checking if tags is NULL pointer in blk_mq_clear_rq_mapping().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未检查tags是否为空指针，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 63064be150e4b1ba1e4af594ef5aa81adf21a52d ~ 6a440e6d04431e774dc084abe88c106e2a474c1a -
LinuxLinux 5.16 -

II. Public POCs for CVE-2022-50530

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III. Intelligence Information for CVE-2022-50530

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Same Patch Batch · Linux · 2025-10-07 · 118 CVEs total

CVE-2022-50544usb: host: xhci: Fix potential memory leak in xhci_alloc_stream_info()
CVE-2023-53658spi: bcm-qspi: return error if neither hif_mspi nor mspi is available
CVE-2023-53657ice: Don't tx before switchdev is fully configured
CVE-2023-53656drivers/perf: hisi: Don't migrate perf to the CPU going to teardown
CVE-2023-53655rcu: Avoid stack overflow due to __rcu_irq_enter_check_tick() being kprobe-ed
CVE-2022-50555tipc: fix a null-ptr-deref in tipc_topsrv_accept
CVE-2022-50554blk-mq: avoid double ->queue_rq() because of early timeout
CVE-2022-50553tracing/hist: Fix out-of-bound write on 'action_data.var_ref_idx'
CVE-2022-50552blk-mq: use quiesced elevator switch when reinitializing queues
CVE-2022-50551wifi: brcmfmac: Fix potential shift-out-of-bounds in brcmf_fw_alloc_request()
CVE-2022-50550blk-iolatency: Fix memory leak on add_disk() failures
CVE-2022-50549dm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata
CVE-2022-50547media: solo6x10: fix possible memory leak in solo_sysfs_init()
CVE-2022-50548media: i2c: hi846: Fix memory leak in hi846_parse_dt()
CVE-2022-50546ext4: fix uninititialized value in 'ext4_evict_inode'
CVE-2023-53654octeontx2-af: Add validation before accessing cgx and lmac
CVE-2022-50537firmware: raspberrypi: fix possible memory leak in rpi_firmware_probe()
CVE-2022-50536bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data
CVE-2022-50535drm/amd/display: Fix potential null-deref in dm_resume
CVE-2023-53652vdpa: Add features attr to vdpa_nl_policy for nlattr length check

Showing top 20 of 118 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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