{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72073", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.904Z", "datePublished": "2026-08-15T05:52:24.676Z", "dateUpdated": "2026-08-15T05:52:24.676Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-15T05:52:24.676Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: vub300: fix use-after-free on probe failure\n\nThe vub300 driver lifetime-manages its controller state using\nvub300->kref, with vub300_delete() freeing the mmc host when the last\nreference is dropped. The probe error path after the inactivity timer has\nbeen armed still bypasses that lifetime rule, however, and falls through\nto mmc_free_host() directly if mmc_add_host() fails.\n\nThe race window is between arming the inactivity timer and reaching the\nprobe error unwind after mmc_add_host() fails:\n\n probe thread timer/workqueue\n ------------ ---------------\n kref_init(&vub300->kref) ref = 1\n kref_get(&vub300->kref) ref = 2, timer ref\n add_timer(inactivity_timer) fires after one second\n |\n | race window\n |<---------------------------------------------------->\n |\n mmc_add_host(mmc)\n inactivity timer fires\n vub300_queue_dead_work()\n kref_get() ref = 3\n queue_work(deadwork)\n mmc_add_host() fails\n timer_delete_sync()\n mmc_free_host(mmc)\n frees vub300\n deadwork runs\n use-after-free\n\nThe inactivity timeout is one second, so this would require\nmmc_add_host() to both fail and take more than one second to do so. This\nis unlikely to happen in practice, but the error path is still wrong.\n\ntimer_delete_sync() only waits for the timer callback itself. It does\nnot flush deadwork that the callback may already have queued. As a\nresult, queued deadwork can still hold a kref while the probe error path\ndirectly frees the backing mmc host, including the vub300 storage.\n\nFix this by using the same lifetime mechanism as disconnect. Clear\nvub300->interface so that the timer callback and any queued deadwork\nreturn early and drop their references, then drop the initial probe\nreference and return without falling through to err_free_host." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mmc/host/vub300.c" ], "versions": [ { "version": "0613ad2401f88bdeae5594c30afe318e93b14676", "lessThan": "5b82af744e06cd741938c3da54fdbe564a7e52d9", "status": "affected", "versionType": "git" }, { "version": "0613ad2401f88bdeae5594c30afe318e93b14676", "lessThan": "618cf6b139503ec18ef93ffd663396aaf99b763a", "status": "affected", "versionType": "git" }, { "version": "0613ad2401f88bdeae5594c30afe318e93b14676", "lessThan": "a3b5f242997a3be7404112fd48784881560aea57", "status": "affected", "versionType": "git" }, { "version": "41ed46bdbd2878cd6567abe0974a445f8b1b8ec8", "status": "affected", "versionType": "git" }, { "version": "25f05d762ca5e1c685002a53dd44f68e78ca3feb", "status": "affected", "versionType": "git" }, { "version": "a46e681151bbdacdf6b89ee8c4e5bad0555142bb", "status": "affected", "versionType": "git" }, { "version": "3b29f8769d32016b2d89183db4d80c7a71b7e35e", "status": "affected", "versionType": "git" }, { "version": "3049a3b927a40d89d4582ff1033cd7953be773c7", "status": "affected", "versionType": "git" }, { "version": "afc898019e7bf18c5eb7a0ac19852fcb1b341b3c", "status": "affected", "versionType": "git" }, { "version": "c9e85979b59cb86f0a15defa8199d740e2b36b90", "status": "affected", "versionType": "git" }, { "version": "2044b2ea77945f372ef161d1bbf814e471767ff2", "status": "affected", "versionType": "git" }, { "version": "4.9.337", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.303", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.270", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.229", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "5.10.163", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.15.86", "lessThan": "5.16", "status": "affected", "versionType": "semver" }, { "version": "6.0.16", "lessThan": "6.1", "status": "affected", "versionType": "semver" }, { "version": "6.1.2", "lessThan": "6.2", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mmc/host/vub300.c" ], "versions": [ { "version": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2-rc4", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2-rc4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5b82af744e06cd741938c3da54fdbe564a7e52d9" }, { "url": "https://git.kernel.org/stable/c/618cf6b139503ec18ef93ffd663396aaf99b763a" }, { "url": "https://git.kernel.org/stable/c/a3b5f242997a3be7404112fd48784881560aea57" } ], "title": "mmc: vub300: fix use-after-free on probe failure", "x_generator": { "engine": "bippy-1.2.0" } } } }