{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72110", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.906Z", "datePublished": "2026-08-15T05:52:51.805Z", "dateUpdated": "2026-08-23T12:46:50.580Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-23T12:46:50.580Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf,fork: wipe ->bpf_storage before bailouts that access it\n\nCurrently, copy_process() can bail out to free_task() before p->bpf_storage\nhas been initialized, with this call graph (shown here for the\n!CONFIG_MEMCG case):\n\ncopy_process\n dup_task_struct\n arch_dup_task_struct\n [copies the entire task_struct, including ->bpf_storage member]\n [RLIMIT_NPROC check fails]\n delayed_free_task\n free_task\n bpf_task_storage_free\n rcu_dereference(task->bpf_storage)\n bpf_local_storage_destroy\n\nIn this case, the nascent task's ->bpf_storage member that\nbpf_local_storage_destroy() operates on is a plain copy of the parent's\n->bpf_storage pointer, not a real initialized pointer.\nThis leads to badness (kernel hangs, UAF).\n\nThis is reachable as long as the process calling fork() has been inserted\ninto a task storage map." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached via fork()/clone()/clone3() into copy_process() and free_task()->bpf_task_storage_free(); per kernel guidance BPF/fork paths are Local and no network-facing handler can drive this early-bailout teardown.\nAC:L - The attacker controls all conditions: dup_task_struct copies parent ->bpf_storage, then they can deterministically force early copy_process failure (setrlimit(RLIMIT_NPROC) plus fork, fork-until-EAGAIN, or nr_threads exhaustion) to hit bpf_local_storage_destroy on the copied pointer.\nPR:L - Exploitation needs only a local process already inserted into a BPF task storage map (sched_ext/tracing BPF on servers, or BPF loaded via user-namespace CAP_BPF/unprivileged BPF); fork itself needs no real-root capability, so PR:L per user-namespace guidance.\nUI:N - No victim action is required; the attacker triggers the failed fork on a process they run and control the bailout timing themselves.\nS:U - Impact is in-kernel UAF/heap corruption and denial of service on the parent task's BPF local storage; this is standard kernel memory corruption without VM, container, or IOMMU boundary crossing.\nC:H - Destroying the parent's live bpf_local_storage via the child's stale ->bpf_storage pointer is a use-after-free; freed bpf_local_storage/bpf_local_storage_elem objects can be reclaimed for arbitrary kernel memory disclosure per UAF guidance.\nI:H - bpf_local_storage_destroy() unlinks and frees parent storage still referenced by the live forking task, enabling heap grooming and attacker-controlled writes over freed BPF local storage structures for privilege escalation.\nA:H - The fix commit reports kernel hangs and UAF; tearing down active BPF task local storage during failed fork can oops, panic, or deadlock the system, satisfying High availability impact for kernel crashes/UAF." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/fork.c" ], "versions": [ { "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b", "lessThan": "7df67a4799067a59e6a2d53f8059a6be6e73e678", "status": "affected", "versionType": "git" }, { "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b", "lessThan": "aff686efd38728e06daf12417a0d7ed454ce4cff", "status": "affected", "versionType": "git" }, { "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b", "lessThan": "c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74", "status": "affected", "versionType": "git" }, { "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b", "lessThan": "9cff220ddb65b022cc668bb652200742476e744c", "status": "affected", "versionType": "git" }, { "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b", "lessThan": "c4f626ddf2350652ad2f79daf1f10847f3f6eabd", "status": "affected", "versionType": "git" }, { "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b", "lessThan": "43f0005f81b8ce3be962d653cde8db9022f1e9b0", "status": "affected", "versionType": "git" }, { "version": "a10787e6d58c24b51e91c19c6d16c5da89fcaa4b", "lessThan": "9b51a6155d14389876916726430da30eabb1d4ed", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/fork.c" ], "versions": [ { "version": "5.13", "status": "affected" }, { "version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.217", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.184", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "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": "5.13", "versionEndExcluding": "5.15.217" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.1.184" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.6.145" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.12.97" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "6.18.40" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.1.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "7.2" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7df67a4799067a59e6a2d53f8059a6be6e73e678" }, { "url": "https://git.kernel.org/stable/c/aff686efd38728e06daf12417a0d7ed454ce4cff" }, { "url": "https://git.kernel.org/stable/c/c3fd6f28c7ce1142a3b23dbb840eaa4777de1d74" }, { "url": "https://git.kernel.org/stable/c/9cff220ddb65b022cc668bb652200742476e744c" }, { "url": "https://git.kernel.org/stable/c/c4f626ddf2350652ad2f79daf1f10847f3f6eabd" }, { "url": "https://git.kernel.org/stable/c/43f0005f81b8ce3be962d653cde8db9022f1e9b0" }, { "url": "https://git.kernel.org/stable/c/9b51a6155d14389876916726430da30eabb1d4ed" } ], "title": "bpf,fork: wipe ->bpf_storage before bailouts that access it", "x_generator": { "engine": "bippy-1.2.0" } } } }