usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90024
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-16 11:17:15 UTC
Updated2026-09-16 11:17:15 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs A null-pointer dereference occurs in f_midi2_free_ep_reqs() when attempting to clean up an endpoint that was never initialized. When configuring the MIDI 2.0 gadget via configfs and setting the block direction to SNDRV_UMP_DIR_INPUT, the initialization of the midi1_ep_out endpoint is explicitly skipped during the gadget bind phase (f_midi2_bind()). As a result, the usb_ep->card field remains NULL. Later, when the host sets the alternate setting, f_midi2_set_alt() unconditionally stops both the IN and OUT endpoints by calling f_midi2_stop_eps(), which in turn calls f_midi2_free_ep_reqs() for both endpoints. When f_midi2_free_ep_reqs() is called for the uninitialized midi1_ep_out, it attempts to dereference usb_ep->card to determine the number of requests to free, leading to a crash. Fix this by using usb_ep->num_reqs instead of usb_ep->card->info.num_reqs in f_midi2_free_ep_reqs(). usb_ep->num_reqs is correctly set during f_midi2_init_ep() and remains 0 if the endpoint was never initialized, safely avoiding the loop. For consistency, apply the same change to f_midi2_alloc_ep_reqs(). Oops: general protection fault, probably for non-canonical address 0xdffffc00000000ee: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000770-0x0000000000000777] ... RIP: 0010:f_midi2_free_ep_reqs drivers/usb/gadget/function/f_midi2.c:1166 [inline] RIP: 0010:f_midi2_stop_eps+0x28e/0x4d0 drivers/usb/gadget/function/f_midi2.c:1246 ... Call Trace: <TASK> f_midi2_set_alt+0x11c/0xf00 drivers/usb/gadget/function/f_midi2.c:1296 composite_setup+0x1ffd/0x3480 drivers/usb/gadget/composite.c:1933 configfs_composite_setup+0xbd/0x100 drivers/usb/gadget/configfs.c:1877

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 8b645922b22303cec4628dbbbf6c8553d1cdec87 51ddc55c75087ac25342f6d73d3aeaf14f59bd76 git Not specified
CNA Linux Linux affected 8b645922b22303cec4628dbbbf6c8553d1cdec87 5b92f6a0c7c01efbb335d837ecdf34d38d98720f git Not specified
CNA Linux Linux affected 8b645922b22303cec4628dbbbf6c8553d1cdec87 9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a git Not specified
CNA Linux Linux affected 8b645922b22303cec4628dbbbf6c8553d1cdec87 4079f19a0e1ce76f1e21a398f02aca150ceaaf61 git Not specified
CNA Linux Linux affected 8b645922b22303cec4628dbbbf6c8553d1cdec87 f0efaf1872949e96d213c8e910fd9517f7d7c406 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.51 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.5 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/f0efaf1872949e96d213c8e910fd9517f7d7c406 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5b92f6a0c7c01efbb335d837ecdf34d38d98720f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4079f19a0e1ce76f1e21a398f02aca150ceaaf61 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/51ddc55c75087ac25342f6d73d3aeaf14f59bd76 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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