Description

In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix use-after-free KFENCE violation during sysfs firmware write During the sysfs firmware write process, a use-after-free read warning is logged from the lpfc_wr_object() routine: BUG: KFENCE: use-after-free read in lpfc_wr_object+0x235/0x310 [lpfc] Use-after-free read at 0x0000000000cf164d (in kfence-#111): lpfc_wr_object+0x235/0x310 [lpfc] lpfc_write_firmware.cold+0x206/0x30d [lpfc] lpfc_sli4_request_firmware_update+0xa6/0x100 [lpfc] lpfc_request_firmware_upgrade_store+0x66/0xb0 [lpfc] kernfs_fop_write_iter+0x121/0x1b0 new_sync_write+0x11c/0x1b0 vfs_write+0x1ef/0x280 ksys_write+0x5f/0xe0 do_syscall_64+0x59/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd The driver accessed wr_object pointer data, which was initialized into mailbox payload memory, after the mailbox object was released back to the mailbox pool. Fix by moving the mailbox free calls to the end of the routine ensuring that we don't reference internal mailbox memory after release.

Weaknesses 1

Affected Products 3

References 4

• git.kernel.org https://git.kernel.org/stable/c/21681b81b9ae548c5dae7ae00d931197a27f480c
  Patch
• git.kernel.org https://git.kernel.org/stable/c/51ab4eb1a25e73c7fc2ad9026520c4d8369c93cc
  Patch
• git.kernel.org https://git.kernel.org/stable/c/8becb97918f04bb177bc9c4e00c2bdb302e00944
  Patch
• git.kernel.org https://git.kernel.org/stable/c/8dfefa8f424ab208e552df1bfd008b732f3d0ad1
  Patch

Remediation

• git.kernel.org https://git.kernel.org/stable/c/21681b81b9ae548c5dae7ae00d931197a27f480c
  Patch
• git.kernel.org https://git.kernel.org/stable/c/51ab4eb1a25e73c7fc2ad9026520c4d8369c93cc
  Patch
• git.kernel.org https://git.kernel.org/stable/c/8becb97918f04bb177bc9c4e00c2bdb302e00944
  Patch
• git.kernel.org https://git.kernel.org/stable/c/8dfefa8f424ab208e552df1bfd008b732f3d0ad1
  Patch