CVE-2024-42287: scsi: qla2xxx: Complete command early within lock
In the Linux kernel, the following vulnerability has been resolved:
scsi: qla2xxx: Complete command early within lock
A crash was observed while performing NPIV and FW reset,
BUG: kernel NULL pointer dereference, address: 000000000000001c #PF: supervisor read access in kernel mode #PF: errorcode(0x0000) - not-present page PGD 0 P4D 0 Oops: 0000 1 PREEMPTRT SMP NOPTI RIP: 0010:dmadirectunmapsg+0x51/0x1e0 RSP: 0018:ffffc90026f47b88 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000021 RCX: 0000000000000002 RDX: 0000000000000021 RSI: 0000000000000000 RDI: ffff8881041130d0 RBP: ffff8881041130d0 R08: 0000000000000000 R09: 0000000000000034 R10: ffffc90026f47c48 R11: 0000000000000031 R12: 0000000000000000 R13: 0000000000000000 R14: ffff8881565e4a20 R15: 0000000000000000 FS: 00007f4c69ed3d00(0000) GS:ffff889faac80000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000000000001c CR3: 0000000288a50002 CR4: 00000000007706e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 Call Trace: <TASK> ? diebody+0x1a/0x60 ? pagefaultoops+0x16f/0x4a0 ? douseraddrfault+0x174/0x7f0 ? excpagefault+0x69/0x1a0 ? asmexcpagefault+0x22/0x30 ? dmadirectunmapsg+0x51/0x1e0 ? preemptcountsub+0x96/0xe0 qla2xxxqpairspfreedma+0x29f/0x3b0 [qla2xxx] qla2xxxqpairspcompl+0x60/0x80 [qla2xxx] qla2x00abortallcmds+0xa2/0x450 [qla2xxx]
The command completion was done early while aborting the commands in driver unload path but outside lock to avoid the WARNON condition of performing dmafreeattr within the lock. However this caused race condition while command completion via multiple paths causing system crash.
Hence complete the command early in unload path but within the lock to avoid race condition.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1 - Upgrade
Upgrade
debian/linux-6.1to a version that resolves this vulnerability.Fixed in 6.1.129-1~deb11u1 - Upgrade
Upgrade
Linux kernel (scsi/qla2xxx)to a version that resolves this vulnerability.Patch scsi: qla2xxx: Complete command early within lock - Configuration
In the qla2xxx unload/abort completion flow, ensure command completion is performed early within the relevant lock (not outside the lock) to address the race condition and the NULL pointer dereference crash observed in dma_direct_unmap_sg+0x51/0x1e0.
qla2xxx SCSI driver command completion timing = Complete the command early within the lock (and avoid completing it outside the lock) to prevent the WARN_ON path involving dma_free_attr within the lock while also avoiding the earlier NULL dereference/race described.
Event History
Frequently Asked Questions
What is the severity of CVE-2024-42287?
CVE-2024-42287 has not been assigned a specific CVSS score, but it addresses a critical kernel bug that could lead to crashes.
How do I fix CVE-2024-42287?
To fix CVE-2024-42287, you should upgrade to the latest patched version of the Linux kernel specified in your distribution's advisory.
What systems are affected by CVE-2024-42287?
CVE-2024-42287 affects various versions of the Linux kernel, particularly those prior to 5.10.224 and multiple versions between significant ranges.
What exploit does CVE-2024-42287 address?
CVE-2024-42287 addresses a vulnerability that allowed a kernel NULL pointer dereference during NPIV and firmware resets.
Can CVE-2024-42287 lead to unauthorized access?
CVE-2024-42287 does not directly lead to unauthorized access but may cause system crashes that could be exploited in certain environments.