CVE-2021-47183

published 2024-04-10

CVE-2021-47183: In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix link down processing to address NULL pointer dereference If an FC link down…

Priority P4 21 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

In the Linux kernel, the following vulnerability has been resolved:

scsi: lpfc: Fix link down processing to address NULL pointer dereference

If an FC link down transition while PLOGIs are outstanding to fabric well
known addresses, outstanding ABTS requests may result in a NULL pointer
dereference. Driver unload requests may hang with repeated "2878" log
messages.

The Link down processing results in ABTS requests for outstanding ELS
requests. The Abort WQEs are sent for the ELSs before the driver had set
the link state to down. Thus the driver is sending the Abort with the
expectation that an ABTS will be sent on the wire. The Abort request is
stalled waiting for the link to come up. In some conditions the driver may
auto-complete the ELSs thus if the link does come up, the Abort completions
may reference an invalid structure.

Fix by ensuring that Abort set the flag to avoid link traffic if issued due
to conditions where the link failed.

Affected

10 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 5.15.5-1 (bookworm)	linux 5.15.5-1 (bookworm)
linux	linux	—	—
linux	linux	>= 70f3c073362ef7b5e55c92b83eb2dd9a7fb4e9bf < 04c1af683270e4709a594bb1691b8800b945035a	04c1af683270e4709a594bb1691b8800b945035a
linux	linux	>= 70f3c073362ef7b5e55c92b83eb2dd9a7fb4e9bf < 28de48a7cea495ab48082d9ff4ef63f7cb4e563a	28de48a7cea495ab48082d9ff4ef63f7cb4e563a
linux	linux	>= 70f3c073362ef7b5e55c92b83eb2dd9a7fb4e9bf < 1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6	1854f53ccd88ad4e7568ddfafafffe71f1ceb0a6
linux	linux_kernel	< 5.15.5	5.15.5
linux	linux_kernel	>= 0 < 5.10.244-1	5.10.244-1
linux	linux_kernel	>= 0 < 5.15.5-1	5.15.5-1
linux	linux_kernel	>= 0 < 5.15.5-1	5.15.5-1
linux	linux_kernel	>= 0 < 5.15.5-1	5.15.5-1

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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CWE-476