| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2021-47269: usb: dwc3: ep0: fix NULL pointer exception |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| usb: dwc3: ep0: fix NULL pointer exception |
| |
| There is no validation of the index from dwc3_wIndex_to_dep() and we might |
| be referring a non-existing ep and trigger a NULL pointer exception. In |
| certain configurations we might use fewer eps and the index might wrongly |
| indicate a larger ep index than existing. |
| |
| By adding this validation from the patch we can actually report a wrong |
| index back to the caller. |
| |
| In our usecase we are using a composite device on an older kernel, but |
| upstream might use this fix also. Unfortunately, I cannot describe the |
| hardware for others to reproduce the issue as it is a proprietary |
| implementation. |
| |
| [ 82.958261] Unable to handle kernel NULL pointer dereference at virtual address 00000000000000a4 |
| [ 82.966891] Mem abort info: |
| [ 82.969663] ESR = 0x96000006 |
| [ 82.972703] Exception class = DABT (current EL), IL = 32 bits |
| [ 82.978603] SET = 0, FnV = 0 |
| [ 82.981642] EA = 0, S1PTW = 0 |
| [ 82.984765] Data abort info: |
| [ 82.987631] ISV = 0, ISS = 0x00000006 |
| [ 82.991449] CM = 0, WnR = 0 |
| [ 82.994409] user pgtable: 4k pages, 39-bit VAs, pgdp = 00000000c6210ccc |
| [ 83.000999] [00000000000000a4] pgd=0000000053aa5003, pud=0000000053aa5003, pmd=0000000000000000 |
| [ 83.009685] Internal error: Oops: 96000006 [#1] PREEMPT SMP |
| [ 83.026433] Process irq/62-dwc3 (pid: 303, stack limit = 0x000000003985154c) |
| [ 83.033470] CPU: 0 PID: 303 Comm: irq/62-dwc3 Not tainted 4.19.124 #1 |
| [ 83.044836] pstate: 60000085 (nZCv daIf -PAN -UAO) |
| [ 83.049628] pc : dwc3_ep0_handle_feature+0x414/0x43c |
| [ 83.054558] lr : dwc3_ep0_interrupt+0x3b4/0xc94 |
| |
| ... |
| |
| [ 83.141788] Call trace: |
| [ 83.144227] dwc3_ep0_handle_feature+0x414/0x43c |
| [ 83.148823] dwc3_ep0_interrupt+0x3b4/0xc94 |
| [ 83.181546] ---[ end trace aac6b5267d84c32f ]--- |
| |
| The Linux kernel CVE team has assigned CVE-2021-47269 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Fixed in 4.4.273 with commit 96b74a99d360235c24052f1d060e64ac53f43528 |
| Fixed in 4.9.273 with commit 60156089f07e724e4dc8483702d5e1ede4522749 |
| Fixed in 4.14.237 with commit 990dc90750772622d44ca2ea6652c521e6f67e16 |
| Fixed in 4.19.195 with commit bd551e7c85939de2182010273450bfa78c3742fc |
| Fixed in 5.4.126 with commit 366369b89bedd59b1425386e8d4a18a466e420e4 |
| Fixed in 5.10.44 with commit 470403639114895e2697c766fbe17be8d0e9b67a |
| Fixed in 5.12.11 with commit 788755756dd4a6aba1de479fec20b0fa600e7f19 |
| Fixed in 5.13 with commit d00889080ab60051627dab1d85831cd9db750e2a |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2021-47269 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| drivers/usb/dwc3/ep0.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/96b74a99d360235c24052f1d060e64ac53f43528 |
| https://git.kernel.org/stable/c/60156089f07e724e4dc8483702d5e1ede4522749 |
| https://git.kernel.org/stable/c/990dc90750772622d44ca2ea6652c521e6f67e16 |
| https://git.kernel.org/stable/c/bd551e7c85939de2182010273450bfa78c3742fc |
| https://git.kernel.org/stable/c/366369b89bedd59b1425386e8d4a18a466e420e4 |
| https://git.kernel.org/stable/c/470403639114895e2697c766fbe17be8d0e9b67a |
| https://git.kernel.org/stable/c/788755756dd4a6aba1de479fec20b0fa600e7f19 |
| https://git.kernel.org/stable/c/d00889080ab60051627dab1d85831cd9db750e2a |
