UBUNTU-CVE-2024-53227: Use After Free
In the Linux kernel, the following vulnerability has been resolved: scsi: bfa: Fix use-after-free in bfadimmoduleexit() BUG: KASAN: slab-use-after-free in lockacquire+0x2aca/0x3a20 Read of size 8 at addr ffff8881082d80c8 by task modprobe/25303 Call Trace: <TASK> dumpstacklvl+0x95/0xe0 printreport+0xcb/0x620 kasanreport+0xbd/0xf0 lockacquire+0x2aca/0x3a20 lockacquire+0x19b/0x520 rawspinlock+0x2b/0x40 attributecontainerunregister+0x30/0x160 fcreleasetransport+0x19/0x90 [scsitransportfc] bfadimmoduleexit+0x23/0x60 [bfa] bfadinit+0xdb/0xff0 [bfa] dooneinitcall+0xdc/0x550 doinitmodule+0x22d/0x6b0 loadmodule+0x4e96/0x5ff0 initmodulefromfile+0xcd/0x130 idempotentinitmodule+0x330/0x620 x64sysfinitmodule+0xb3/0x110 dosyscall64+0xc1/0x1d0 entrySYSCALL64afterhwframe+0x77/0x7f </TASK> Allocated by task 25303: kasansavestack+0x24/0x50 kasansavetrack+0x14/0x30 kasankmalloc+0x7f/0x90 fcattachtransport+0x4f/0x4740 [scsitransportfc] bfadimmoduleinit+0x17/0x80 [bfa] bfadinit+0x23/0xff0 [bfa] dooneinitcall+0xdc/0x550 doinitmodule+0x22d/0x6b0 loadmodule+0x4e96/0x5ff0 initmodulefromfile+0xcd/0x130 idempotentinitmodule+0x330/0x620 x64sysfinitmodule+0xb3/0x110 dosyscall64+0xc1/0x1d0 entrySYSCALL64afterhwframe+0x77/0x7f Freed by task 25303: kasansavestack+0x24/0x50 kasansavetrack+0x14/0x30 kasansavefreeinfo+0x3b/0x60 kasanslabfree+0x38/0x50 kfree+0x212/0x480 bfadimmoduleinit+0x7e/0x80 [bfa] bfadinit+0x23/0xff0 [bfa] dooneinitcall+0xdc/0x550 doinitmodule+0x22d/0x6b0 loadmodule+0x4e96/0x5ff0 initmodulefromfile+0xcd/0x130 idempotentinitmodule+0x330/0x620 x64sysfinitmodule+0xb3/0x110 dosyscall64+0xc1/0x1d0 entrySYSCALL64afterhwframe+0x77/0x7f Above issue happens as follows: bfadinit error = bfadimmoduleinit() fcreleasetransport(bfadimscsitransporttemplate); if (error) goto ext; ext: bfadimmoduleexit(); fcreleasetransport(bfadimscsitransporttemplate); --> Trigger double release Don't call bfadimmoduleexit() if bfadimmoduleinit() failed.
Affected Software
Remediation
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ubuntu/linux-fipsto a version that resolves this vulnerability.Fixed in 6.8.0-78.78+fips1 - Compensating control
In bfad_init, do not call bfad_im_module_exit() when bfad_im_module_init() has failed, preventing the duplicate fc_release_transport() call and double release.
Event History
Frequently Asked Questions
What systems are exposed to this issue?
The affected software list includes Ubuntu Linux kernels for standard, AWS, Azure, GCP, FIPS, AWS FIPS, Azure FIPS, and GCP FIPS variants. The fault is in the SCSI bfa driver and its Fibre Channel transport handling.
What level of access does an attacker need?
The severity vector indicates local access and low privileges are required, with no user interaction required. Successful exploitation can affect confidentiality, integrity, and availability.
When does the vulnerable code path occur?
The reported use-after-free occurs during initialization and module exit handling for the bfa driver, involving Fibre Channel transport registration and cleanup. The trace shows the condition during bfa module loading and initialization.
What evidence could indicate the issue has been triggered?
A KASAN report identifying a slab use-after-free in __lock_acquire, with bfad_im_module_exit, fc_release_transport, attribute_container_unregister, and the bfa or scsi_transport_fc modules in the stack, is evidence of this condition.