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CVE-2021-47077— scsi: qedf: Add pointer checks in qedf_update_link_speed()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于空指针取消引用。

AI Predicted 7.8 Difficulty: Easy EPSS 0.22% · P12

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 61d8658b4a435eac729966cc94cdda077a8df5cd< a6362a737572f66051deb7637f3f77ddf7a4402f affected
61d8658b4a435eac729966cc94cdda077a8df5cd< 11014efcec378bb0050a6cf08eaf375e3693400a affected
61d8658b4a435eac729966cc94cdda077a8df5cd< 73578af92a0fae6609b955fcc9113e50e413c80f affected
4.11 affected
< 4.11 unaffected
5.10.40≤ 5.10.* unaffected
5.12.7≤ 5.12.* unaffected
5.13≤ * unaffected
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I. Basic Information for CVE-2021-47077

Vulnerability Information
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Vulnerability Title
scsi: qedf: Add pointer checks in qedf_update_link_speed()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: scsi: qedf: Add pointer checks in qedf_update_link_speed() The following trace was observed: [ 14.042059] Call Trace: [ 14.042061] <IRQ> [ 14.042068] qedf_link_update+0x144/0x1f0 [qedf] [ 14.042117] qed_link_update+0x5c/0x80 [qed] [ 14.042135] qed_mcp_handle_link_change+0x2d2/0x410 [qed] [ 14.042155] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042170] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042186] ? qed_rd+0x13/0x40 [qed] [ 14.042205] qed_mcp_handle_events+0x437/0x690 [qed] [ 14.042221] ? qed_set_ptt+0x70/0x80 [qed] [ 14.042239] qed_int_sp_dpc+0x3a6/0x3e0 [qed] [ 14.042245] tasklet_action_common.isra.14+0x5a/0x100 [ 14.042250] __do_softirq+0xe4/0x2f8 [ 14.042253] irq_exit+0xf7/0x100 [ 14.042255] do_IRQ+0x7f/0xd0 [ 14.042257] common_interrupt+0xf/0xf [ 14.042259] </IRQ> API qedf_link_update() is getting called from QED but by that time shost_data is not initialised. This results in a NULL pointer dereference when we try to dereference shost_data while updating supported_speeds. Add a NULL pointer check before dereferencing shost_data.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux 61d8658b4a435eac729966cc94cdda077a8df5cd ~ a6362a737572f66051deb7637f3f77ddf7a4402f -
Linux Linux 4.11 -

II. Public POCs for CVE-2021-47077

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III. Intelligence Information for CVE-2021-47077

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Other References for CVE-2021-47077 (2)

Same Patch Batch · Linux · 2024-03-01 · 13 CVEs total

CVE-2021-47081 7.8 HIGH habanalabs/gaudi: Fix a potential use after free in gaudi_memset_device_memory
CVE-2021-47078 7.8 HIGH RDMA/rxe: Clear all QP fields if creation failed
CVE-2021-47069 7.8 HIGH ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry
CVE-2021-47080 RDMA/core: Prevent divide-by-zero error triggered by the user
CVE-2021-47079 platform/x86: ideapad-laptop: fix a NULL pointer dereference
CVE-2021-47075 nvmet: fix memory leak in nvmet_alloc_ctrl()
CVE-2021-47076 RDMA/rxe: Return CQE error if invalid lkey was supplied
CVE-2021-47074 nvme-loop: fix memory leak in nvme_loop_create_ctrl()
CVE-2021-47072 btrfs: fix removed dentries still existing after log is synced
CVE-2021-47073 platform/x86: dell-smbios-wmi: Fix oops on rmmod dell_smbios
CVE-2021-47071 uio_hv_generic: Fix a memory leak in error handling paths
CVE-2021-47070 uio_hv_generic: Fix another memory leak in error handling paths

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47077

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