7.8
HIGH
CVE-2024-26996
Linux usb gadget ncm use-after-free vulnerability
Description

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.

INFO

Published Date :

May 1, 2024, 6:15 a.m.

Last Modified :

Dec. 23, 2024, 7:49 p.m.

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Remotely Exploitable :

No

Impact Score :

5.9

Exploitability Score :

1.8
Affected Products

The following products are affected by CVE-2024-26996 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2024-26996 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2024-26996 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • Initial Analysis by [email protected]

    Dec. 23, 2024

    Action Type Old Value New Value
    Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    Added CWE NIST CWE-416
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions up to (excluding) 5.15.157 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.88 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.29 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.8.8 *cpe:2.3:o:linux:linux_kernel:6.9:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.9:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.9:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.9:rc4:*:*:*:*:*:*
    Changed Reference Type https://git.kernel.org/stable/c/0588bbbd718a8130b98c54518f1e0b569ce60a93 No Types Assigned https://git.kernel.org/stable/c/0588bbbd718a8130b98c54518f1e0b569ce60a93 Patch
    Changed Reference Type https://git.kernel.org/stable/c/0588bbbd718a8130b98c54518f1e0b569ce60a93 No Types Assigned https://git.kernel.org/stable/c/0588bbbd718a8130b98c54518f1e0b569ce60a93 Patch
    Changed Reference Type https://git.kernel.org/stable/c/6334b8e4553cc69f51e383c9de545082213d785e No Types Assigned https://git.kernel.org/stable/c/6334b8e4553cc69f51e383c9de545082213d785e Patch
    Changed Reference Type https://git.kernel.org/stable/c/6334b8e4553cc69f51e383c9de545082213d785e No Types Assigned https://git.kernel.org/stable/c/6334b8e4553cc69f51e383c9de545082213d785e Patch
    Changed Reference Type https://git.kernel.org/stable/c/7250326cbb1f4f90391ac511a126b936cefb5bb7 No Types Assigned https://git.kernel.org/stable/c/7250326cbb1f4f90391ac511a126b936cefb5bb7 Patch
    Changed Reference Type https://git.kernel.org/stable/c/7250326cbb1f4f90391ac511a126b936cefb5bb7 No Types Assigned https://git.kernel.org/stable/c/7250326cbb1f4f90391ac511a126b936cefb5bb7 Patch
    Changed Reference Type https://git.kernel.org/stable/c/7f67c2020cb08499c400abf0fc32c65e4d9a09ca No Types Assigned https://git.kernel.org/stable/c/7f67c2020cb08499c400abf0fc32c65e4d9a09ca Patch
    Changed Reference Type https://git.kernel.org/stable/c/7f67c2020cb08499c400abf0fc32c65e4d9a09ca No Types Assigned https://git.kernel.org/stable/c/7f67c2020cb08499c400abf0fc32c65e4d9a09ca Patch
    Changed Reference Type https://git.kernel.org/stable/c/f356fd0cbd9c9cbd0854657a80d1608d0d732db3 No Types Assigned https://git.kernel.org/stable/c/f356fd0cbd9c9cbd0854657a80d1608d0d732db3 Patch
    Changed Reference Type https://git.kernel.org/stable/c/f356fd0cbd9c9cbd0854657a80d1608d0d732db3 No Types Assigned https://git.kernel.org/stable/c/f356fd0cbd9c9cbd0854657a80d1608d0d732db3 Patch
  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://git.kernel.org/stable/c/0588bbbd718a8130b98c54518f1e0b569ce60a93
    Added Reference https://git.kernel.org/stable/c/6334b8e4553cc69f51e383c9de545082213d785e
    Added Reference https://git.kernel.org/stable/c/7250326cbb1f4f90391ac511a126b936cefb5bb7
    Added Reference https://git.kernel.org/stable/c/7f67c2020cb08499c400abf0fc32c65e4d9a09ca
    Added Reference https://git.kernel.org/stable/c/f356fd0cbd9c9cbd0854657a80d1608d0d732db3
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 29, 2024

    Action Type Old Value New Value
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 13, 2024

    Action Type Old Value New Value
    Removed Reference kernel.org https://lists.fedoraproject.org/archives/list/[email protected]/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/
    Removed Reference kernel.org https://lists.fedoraproject.org/archives/list/[email protected]/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/
    Removed Reference kernel.org https://lists.fedoraproject.org/archives/list/[email protected]/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 03, 2024

    Action Type Old Value New Value
    Added Reference kernel.org https://lists.fedoraproject.org/archives/list/[email protected]/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/ [No types assigned]
    Added Reference kernel.org https://lists.fedoraproject.org/archives/list/[email protected]/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/ [No types assigned]
    Added Reference kernel.org https://lists.fedoraproject.org/archives/list/[email protected]/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/ [No types assigned]
  • CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 01, 2024

    Action Type Old Value New Value
    Added Description 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.
    Added Reference kernel.org https://git.kernel.org/stable/c/7f67c2020cb08499c400abf0fc32c65e4d9a09ca [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/0588bbbd718a8130b98c54518f1e0b569ce60a93 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/f356fd0cbd9c9cbd0854657a80d1608d0d732db3 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/7250326cbb1f4f90391ac511a126b936cefb5bb7 [No types assigned]
    Added Reference kernel.org https://git.kernel.org/stable/c/6334b8e4553cc69f51e383c9de545082213d785e [No types assigned]
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2024-26996 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2024-26996 weaknesses.

CVSS31 - Vulnerability Scoring System
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Latest DB Update: Jul. 14, 2025 10:15