UBUNTU-CVE-2024-26996
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Fix UAF ncm object at re-bind after usb ep transport error When ncm function is working and then stop usb0 interface for link down, eth_stop() is called. At this piont, accidentally if usb transport error should happen in usb_ep_enable(), 'in_ep' and/or 'out_ep' may not be enabled. After that, ncm_disable() is called to disable for ncm unbind but gether_disconnect() is never called since 'in_ep' is not enabled. As the result, ncm object is released in ncm unbind but 'dev->port_usb' associated to 'ncm->port' is not NULL. And when ncm bind again to recover netdev, ncm object is reallocated but usb0 interface is already associated to previous released ncm object. Therefore, once usb0 interface is up and eth_start_xmit() is called, released ncm object is dereferrenced and it might cause use-after-free memory. [function unlink via configfs] usb0: eth_stop dev->port_usb=ffffff9b179c3200 --> error happens in usb_ep_enable(). NCM: ncm_disable: ncm=ffffff9b179c3200 --> no gether_disconnect() since ncm->port.in_ep->enabled is false. NCM: ncm_unbind: ncm unbind ncm=ffffff9b179c3200 NCM: ncm_free: ncm free ncm=ffffff9b179c3200 <-- released ncm [function link via configfs] NCM: ncm_alloc: ncm alloc ncm=ffffff9ac4f8a000 NCM: ncm_bind: ncm bind ncm=ffffff9ac4f8a000 NCM: ncm_set_alt: ncm=ffffff9ac4f8a000 alt=0 usb0: eth_open dev->port_usb=ffffff9b179c3200 <-- previous released ncm usb0: eth_start dev->port_usb=ffffff9b179c3200 <-- eth_start_xmit() --> dev->wrap() Unable to handle kernel paging request at virtual address dead00000000014f This patch addresses the issue by checking if 'ncm->netdev' is not NULL at ncm_disable() to call gether_disconnect() to deassociate 'dev->port_usb'. It's more reasonable to check 'ncm->netdev' to call gether_connect/disconnect rather than check 'ncm->port.in_ep->enabled' since it might not be enabled but the gether connection might be established.
02 / AFFECTED SOFTWARE
Affected packages
37 explicit affected versions
13 explicit affected versions
10 explicit affected versions
27 explicit affected versions
1 explicit affected versions
26 explicit affected versions
13 explicit affected versions
6 explicit affected versions
1 explicit affected versions
29 explicit affected versions
96 explicit affected versions
13 explicit affected versions
51 explicit affected versions
1 explicit affected versions
87 explicit affected versions
49 explicit affected versions
108 explicit affected versions
11 explicit affected versions
33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
100 explicit affected versions
11 explicit affected versions
12 explicit affected versions
123 explicit affected versions
7 explicit affected versions
12 explicit affected versions
107 explicit affected versions
2 explicit affected versions
39 explicit affected versions
32 explicit affected versions
116 explicit affected versions
48 explicit affected versions
151 explicit affected versions
137 explicit affected versions
10 explicit affected versions
26 explicit affected versions
8 explicit affected versions
41 explicit affected versions
1 explicit affected versions
8 explicit affected versions
13 explicit affected versions
7 explicit affected versions
123 explicit affected versions
64 explicit affected versions
16 explicit affected versions
51 explicit affected versions
8 explicit affected versions
40 explicit affected versions
3 explicit affected versions
77 explicit affected versions
1 explicit affected versions
2 explicit affected versions
74 explicit affected versions
51 explicit affected versions
76 explicit affected versions
5 explicit affected versions
12 explicit affected versions
37 explicit affected versions
27 explicit affected versions
23 explicit affected versions
1 explicit affected versions
1 explicit affected versions
81 explicit affected versions
1 explicit affected versions
8 explicit affected versions
12 explicit affected versions
5 explicit affected versions
2 explicit affected versions
8 explicit affected versions
1 explicit affected versions
10 explicit affected versions
4 explicit affected versions
13 explicit affected versions
96 explicit affected versions
13 explicit affected versions
59 explicit affected versions
7 explicit affected versions
78 explicit affected versions
43 explicit affected versions
10 explicit affected versions
12 explicit affected versions
12 explicit affected versions
94 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
37 explicit affected versions
37 explicit affected versions
8 explicit affected versions
14 explicit affected versions
38 explicit affected versions
40 explicit affected versions
9 explicit affected versions
40 explicit affected versions
11 explicit affected versions
48 explicit affected versions
7 explicit affected versions
21 explicit affected versions
84 explicit affected versions
67 explicit affected versions
127 explicit affected versions
106 explicit affected versions
4 explicit affected versions
1 explicit affected versions
1 explicit affected versions
46 explicit affected versions
99 explicit affected versions
13 explicit affected versions
43 explicit affected versions
62 explicit affected versions
130 explicit affected versions
151 explicit affected versions
10 explicit affected versions
8 explicit affected versions
3 explicit affected versions
14 explicit affected versions
92 explicit affected versions
4 explicit affected versions
78 explicit affected versions
11 explicit affected versions
1 explicit affected versions
53 explicit affected versions
2 explicit affected versions
11 explicit affected versions
39 explicit affected versions
31 explicit affected versions
45 explicit affected versions
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
19 explicit affected versions
6 explicit affected versions
54 explicit affected versions
57 explicit affected versions
6 explicit affected versions
40 explicit affected versions
76 explicit affected versions
51 explicit affected versions
40 explicit affected versions
10 explicit affected versions
5 explicit affected versions
47 explicit affected versions
191 explicit affected versions
7 explicit affected versions
46 explicit affected versions
1 explicit affected versions
104 explicit affected versions
13 explicit affected versions
71 explicit affected versions
2 explicit affected versions
35 explicit affected versions
7 explicit affected versions
14 explicit affected versions
18 explicit affected versions
9 explicit affected versions
102 explicit affected versions
34 explicit affected versions
6 explicit affected versions
106 explicit affected versions
13 explicit affected versions
4 explicit affected versions
23 explicit affected versions
107 explicit affected versions
9 explicit affected versions
1 explicit affected versions
21 explicit affected versions
16 explicit affected versions
10 explicit affected versions
60 explicit affected versions
7 explicit affected versions
7 explicit affected versions
12 explicit affected versions
38 explicit affected versions
12 explicit affected versions
14 explicit affected versions
7 explicit affected versions
93 explicit affected versions
12 explicit affected versions
109 explicit affected versions
117 explicit affected versions
12 explicit affected versions
104 explicit affected versions
106 explicit affected versions
10 explicit affected versions
2 explicit affected versions
10 explicit affected versions
174 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: usb: gadget: f_ncm: Fix UAF ncm object at re-bind after usb ep transport error When ncm function is working and then stop usb0 interface for link down, eth_stop() is called. At this piont, accidentally if usb transport error should happen in usb_ep_enable(), 'in_ep' and/or 'out_ep' may not be enabled. After that, ncm_disable() is called to disable for ncm unbind but gether_disconnect() is never called since 'in_ep' is not enabled. As the result, ncm object is released in ncm unbind but 'dev->port_usb' associated to 'ncm->port' is not NULL. And when ncm bind again to recover netdev, ncm object is reallocated but usb0 interface is already associated to previous released ncm object. Therefore, once usb0 interface is up and eth_start_xmit() is called, released ncm object is dereferrenced and it might cause use-after-free memory. [function unlink via configfs] usb0: eth_stop dev->port_usb=ffffff9b179c3200 --> error happens in usb_ep_enable(). NCM: ncm_disable: ncm=ffffff9b179c3200 --> no gether_disconnect() since ncm->port.in_ep->enabled is false. NCM: ncm_unbind: ncm unbind ncm=ffffff9b179c3200 NCM: ncm_free: ncm free ncm=ffffff9b179c3200 <-- released ncm [function link via configfs] NCM: ncm_alloc: ncm alloc ncm=ffffff9ac4f8a000 NCM: ncm_bind: ncm bind ncm=ffffff9ac4f8a000 NCM: ncm_set_alt: ncm=ffffff9ac4f8a000 alt=0 usb0: eth_open dev->port_usb=ffffff9b179c3200 <-- previous released ncm usb0: eth_start dev->port_usb=ffffff9b179c3200 <-- eth_start_xmit() --> dev->wrap() Unable to handle kernel paging request at virtual address dead00000000014f This patch addresses the issue by checking if 'ncm->netdev' is not NULL at ncm_disable() to call gether_disconnect() to deassociate 'dev->port_usb'. It's more reasonable to check 'ncm->netdev' to call gether_connect/disconnect rather than check 'ncm->port.in_ep->enabled' since it might not be enabled but the gether connection might be established.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/6334b8e4553cc69f51e383c9de545082213d785e
- https://git.kernel.org/stable/c/0588bbbd718a8130b98c54518f1e0b569ce60a93
- https://git.kernel.org/stable/c/6334b8e4553cc69f51e383c9de545082213d785e
- https://git.kernel.org/stable/c/7250326cbb1f4f90391ac511a126b936cefb5bb7
- https://git.kernel.org/stable/c/7f67c2020cb08499c400abf0fc32c65e4d9a09ca
- https://git.kernel.org/stable/c/f356fd0cbd9c9cbd0854657a80d1608d0d732db3
- https://ubuntu.com/security/CVE-2024-26996
- https://ubuntu.com/security/notices/USN-6893-1
- https://ubuntu.com/security/notices/USN-6893-2
- https://ubuntu.com/security/notices/USN-6893-3
- https://ubuntu.com/security/notices/USN-6898-1
- https://ubuntu.com/security/notices/USN-6898-2
- https://ubuntu.com/security/notices/USN-6898-3
- https://ubuntu.com/security/notices/USN-6898-4
- https://ubuntu.com/security/notices/USN-6917-1
- https://ubuntu.com/security/notices/USN-6918-1
- https://ubuntu.com/security/notices/USN-6919-1
- https://ubuntu.com/security/notices/USN-6927-1
- https://ubuntu.com/security/notices/USN-7019-1
- https://ubuntu.com/security/notices/USN-7496-1
- https://ubuntu.com/security/notices/USN-7496-3
- https://ubuntu.com/security/notices/USN-7496-4
- https://ubuntu.com/security/notices/USN-7496-5
- https://ubuntu.com/security/notices/USN-7506-1
- https://ubuntu.com/security/notices/USN-7506-2
- https://ubuntu.com/security/notices/USN-7506-3
- https://ubuntu.com/security/notices/USN-7506-4
- https://ubuntu.com/security/notices/USN-7516-1
- https://ubuntu.com/security/notices/USN-7516-2
- https://ubuntu.com/security/notices/USN-7516-3
- https://ubuntu.com/security/notices/USN-7516-4
- https://ubuntu.com/security/notices/USN-7516-5
- https://ubuntu.com/security/notices/USN-7516-6
- https://ubuntu.com/security/notices/USN-7516-7
- https://ubuntu.com/security/notices/USN-7516-8
- https://ubuntu.com/security/notices/USN-7516-9
- https://ubuntu.com/security/notices/USN-7517-1
- https://ubuntu.com/security/notices/USN-7517-2
- https://ubuntu.com/security/notices/USN-7517-3
- https://ubuntu.com/security/notices/USN-7518-1
- https://ubuntu.com/security/notices/USN-7539-1
- https://ubuntu.com/security/notices/USN-7540-1
- https://ubuntu.com/security/notices/USN-7640-1
- https://www.cve.org/CVERecord?id=CVE-2024-26996