In the Linux kernel, the following vulnerability has been resolved:
ata: sata_dwc_460ex: Fix crash due to OOB write
the driver uses libata's "tag" values from in various arrays.
Since the mentioned patch bumped the ATA_TAG_INTERNAL to 32,
the value of the SATA_DWC_QCMD_MAX needs to account for that.
Otherwise ATA_TAG_INTERNAL usage cause similar crashes like
this as reported by Tice Rex on the OpenWrt Forum and
reproduced (with symbols) here:
| BUG: Kernel NULL pointer dereference at 0x00000000
| Faulting instruction address: 0xc03ed4b8
| Oops: Kernel access of bad area, sig: 11 [#1]
| BE PAGE_SIZE=4K PowerPC 44x Platform
| CPU: 0 PID: 362 Comm: scsi_eh_1 Not tainted 5.4.163 #0
| NIP: c03ed4b8 LR: c03d27e8 CTR: c03ed36c
| REGS: cfa59950 TRAP: 0300 Not tainted (5.4.163)
| MSR: 00021000 <CE,ME> CR: 42000222 XER: 00000000
| DEAR: 00000000 ESR: 00000000
| GPR00: c03d27e8 cfa59a08 cfa55fe0 00000000 0fa46bc0 [...]
| [..]
| NIP [c03ed4b8] sata_dwc_qc_issue+0x14c/0x254
| LR [c03d27e8] ata_qc_issue+0x1c8/0x2dc
| Call Trace:
| [cfa59a08] [c003f4e0] __cancel_work_timer+0x124/0x194 (unreliable)
| [cfa59a78] [c03d27e8] ata_qc_issue+0x1c8/0x2dc
| [cfa59a98] [c03d2b3c] ata_exec_internal_sg+0x240/0x524
| [cfa59b08] [c03d2e98] ata_exec_internal+0x78/0xe0
| [cfa59b58] [c03d30fc] ata_read_log_page.part.38+0x1dc/0x204
| [cfa59bc8] [c03d324c] ata_identify_page_supported+0x68/0x130
| [...]
This is because sata_dwc_dma_xfer_complete() NULLs the
dma_pending's next neighbour "chan" (a *dma_chan struct) in
this '32' case right here (line ~735):
> hsdevp->dma_pending[tag] = SATA_DWC_DMA_PENDING_NONE;
Then the next time, a dma gets issued; dma_dwc_xfer_setup() passes
the NULL'd hsdevp->chan to the dmaengine_slave_config() which then
causes the crash.
With this patch, SATA_DWC_QCMD_MAX is now set to ATA_MAX_QUEUE + 1.
This avoids the OOB. But please note, there was a worthwhile discussion
on what ATA_TAG_INTERNAL and ATA_MAX_QUEUE is. And why there should not
be a "fake" 33 command-long queue size.
Ideally, the dw driver should account for the ATA_TAG_INTERNAL.
In Damien Le Moal's words: "... having looked at the driver, it
is a bigger change than just faking a 33rd "tag" that is in fact
not a command tag at all."
BugLink: https://github.com/openwrt/openwrt/issues/9505
References
Configurations
Configuration 1 (hide)
|
History
23 Sep 2025, 18:29
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://git.kernel.org/stable/c/234c0132f76f0676d175757f61b0025191a3d935 - Patch | |
| References | () https://git.kernel.org/stable/c/3a8751c0d4e24129e72dcec0139e99833b13904a - Patch | |
| References | () https://git.kernel.org/stable/c/55e1465ba79562a191708a40eeae3f8082a209e3 - Patch | |
| References | () https://git.kernel.org/stable/c/596c7efd69aae94f4b0e91172b075eb197958b99 - Patch | |
| References | () https://git.kernel.org/stable/c/7aa8104a554713b685db729e66511b93d989dd6a - Patch | |
| References | () https://git.kernel.org/stable/c/8a05a6952ecd59aaa62cbdcdaf523ae2c8f436e8 - Patch | |
| References | () https://git.kernel.org/stable/c/fc629224aa62f23849cae83717932985ac51232d - Patch | |
| Summary |
|
|
| CVSS |
v2 : v3 : |
v2 : unknown
v3 : 7.8 |
| CPE | cpe:2.3:o:linux:linux_kernel:5.18:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
|
| CWE | CWE-787 | |
| First Time |
Linux
Linux linux Kernel |
26 Feb 2025, 07:00
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2025-02-26 07:00
Updated : 2025-09-23 18:29
NVD link : CVE-2022-49073
Mitre link : CVE-2022-49073
CVE.ORG link : CVE-2022-49073
JSON object : View
Products Affected
linux
- linux_kernel
CWE
CWE-787
Out-of-bounds Write