usb: gadget: midi2: Fix null-pointer dereference in f_midi2_free_ep_reqs
In 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:116
CVE-2026-90024
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-90024
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
"lessThan": "51ddc55c75087ac25342f6d73d3aeaf14f59bd76",
"versionType": "git"
},
{
"status": "affected",
"version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
"lessThan": "5b92f6a0c7c01efbb335d837ecdf34d38d98720f",
"versionType": "git"
},
{
"status": "affected",
"version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
"lessThan": "9c3d5091e3568ed48ac4c5b08a78eb06fad0d70a",
"versionType": "git"
},
{
"status": "affected",
"version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
"lessThan": "4079f19a0e1ce76f1e21a398f02aca150ceaaf61",
"versionType": "git"
},
{
"status": "affected",
"version": "8b645922b22303cec4628dbbbf6c8553d1cdec87",
"lessThan": "f0efaf1872949e96d213c8e910fd9517f7d7c406",
"versionType": "git"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_midi2.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.51",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.5",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/usb/gadget/function/f_midi2.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-90024
Source reference:
/cveMetadata/cveId
Publisher severity
No explicit severity was provided.
- Event
- #36453 · Revision 1
- Added to Heist Feed
- Publisher date