{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-43423","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-05-01T14:12:56.008Z","datePublished":"2026-05-08T14:21:57.683Z","dateUpdated":"2026-05-11T22:24:18.117Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-05-11T22:24:18.117Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: f_ncm: Fix atomic context locking issue\n\nThe ncm_set_alt function was holding a mutex to protect against races\nwith configfs, which invokes the might-sleep function inside an atomic\ncontext.\n\nRemove the struct net_device pointer from the f_ncm_opts structure to\neliminate the contention. The connection state is now managed by a new\nboolean flag to preserve the use-after-free fix from\ncommit 6334b8e4553c (\"usb: gadget: f_ncm: Fix UAF ncm object at re-bind\nafter usb ep transport error\").\n\nBUG: sleeping function called from invalid context\nCall Trace:\n dump_stack_lvl+0x83/0xc0\n dump_stack+0x14/0x16\n __might_resched+0x389/0x4c0\n __might_sleep+0x8e/0x100\n ...\n __mutex_lock+0x6f/0x1740\n ...\n ncm_set_alt+0x209/0xa40\n set_config+0x6b6/0xb40\n composite_setup+0x734/0x2b40\n ..."}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c","drivers/usb/gadget/function/u_ether_configfs.h","drivers/usb/gadget/function/u_ncm.h"],"versions":[{"version":"b62076e780a2121903ecf9ffdfb89c64647cb7da","lessThan":"e533a44fb1b337d14f772585b67328bee2e0b5e3","status":"affected","versionType":"git"},{"version":"188338c1827842f898761a939669cf345bdf07e2","lessThan":"e95120b4b95ef1c16d8e94e201ae89f5e59e2612","status":"affected","versionType":"git"},{"version":"56a512a9b4107079f68701e7d55da8507eb963d9","lessThan":"0d6c8144ca4d93253de952a5ea0028c19ed7ab68","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/usb/gadget/function/f_ncm.c","drivers/usb/gadget/function/u_ether_configfs.h","drivers/usb/gadget/function/u_ncm.h"],"versions":[{"version":"6.18.17","lessThan":"6.18.19","status":"affected","versionType":"semver"},{"version":"6.19.7","lessThan":"6.19.9","status":"affected","versionType":"semver"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.17","versionEndExcluding":"6.18.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.7","versionEndExcluding":"6.19.9"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/e533a44fb1b337d14f772585b67328bee2e0b5e3"},{"url":"https://git.kernel.org/stable/c/e95120b4b95ef1c16d8e94e201ae89f5e59e2612"},{"url":"https://git.kernel.org/stable/c/0d6c8144ca4d93253de952a5ea0028c19ed7ab68"}],"title":"usb: gadget: f_ncm: Fix atomic context locking issue","x_generator":{"engine":"bippy-1.2.0"}}}}