CVE-2024-26996— usb: gadget: f_ncm: Fix UAF ncm object at re-bind after usb ep transport error
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I. Basic Information for CVE-2024-26996
Vulnerability Information
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Vulnerability Title
usb: gadget: f_ncm: Fix UAF ncm object at re-bind after usb ep transport error
Source: NVD (National Vulnerability Database)
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于存在释放后重用漏洞。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
II. Public POCs for CVE-2024-26996
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Same Patch Batch · Linux · 2024-05-01 · 159 CVEs total
| CVE-2024-27038 | clk: Fix clk_core_get NULL dereference | |
| CVE-2024-27029 | drm/amdgpu: fix mmhub client id out-of-bounds access | |
| CVE-2024-27030 | octeontx2-af: Use separate handlers for interrupts | |
| CVE-2024-27031 | NFS: Fix nfs_netfs_issue_read() xarray locking for writeback interrupt | |
| CVE-2024-27032 | f2fs: fix to avoid potential panic during recovery | |
| CVE-2024-27033 | f2fs: fix to remove unnecessary f2fs_bug_on() to avoid panic | |
| CVE-2024-27034 | f2fs: compress: fix to cover normal cluster write with cp_rwsem | |
| CVE-2024-27035 | f2fs: compress: fix to guarantee persisting compressed blocks by CP | |
| CVE-2024-27036 | cifs: Fix writeback data corruption | |
| CVE-2024-27037 | clk: zynq: Prevent null pointer dereference caused by kmalloc failure | |
| CVE-2024-27044 | drm/amd/display: Fix potential NULL pointer dereferences in 'dcn10_set_output_transfer_fun | |
| CVE-2024-27048 | wifi: brcm80211: handle pmk_op allocation failure | |
| CVE-2024-27047 | net: phy: fix phy_get_internal_delay accessing an empty array | |
| CVE-2024-27046 | nfp: flower: handle acti_netdevs allocation failure | |
| CVE-2024-27045 | drm/amd/display: Fix a potential buffer overflow in 'dp_dsc_clock_en_read()' | |
| CVE-2024-27041 | drm/amd/display: fix NULL checks for adev->dm.dc in amdgpu_dm_fini() | |
| CVE-2024-27039 | clk: hisilicon: hi3559a: Fix an erroneous devm_kfree() | |
| CVE-2024-27040 | drm/amd/display: Add 'replay' NULL check in 'edp_set_replay_allow_active()' | |
| CVE-2024-27028 | spi: spi-mt65xx: Fix NULL pointer access in interrupt handler | |
| CVE-2024-27043 | media: edia: dvbdev: fix a use-after-free |
Showing top 20 of 159 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
Same vendor: Linux
- CVE-2026-43500
rxrpc: Also unshare DATA/RESPONSE packets when paged frags a - CVE-2026-43475
scsi: storvsc: Fix scheduling while atomic on PREEMPT_RT - CVE-2026-43474
fs: init flags_valid before calling vfs_fileattr_get - CVE-2026-43473
scsi: mpi3mr: Add NULL checks when resetting request and rep - CVE-2026-43472
unshare: fix unshare_fs() handling
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