{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-63865", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-07-19T07:54:57.017Z", "datePublished": "2026-07-19T14:04:51.215Z", "dateUpdated": "2026-08-05T12:36:41.333Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:36:41.333Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks\n\nbpf_lsm_task_to_inode() is called under rcu_read_lock() and\nbpf_lsm_inet_conn_established() is called from softirq context, so\nneither hook can be used by sleepable LSM programs." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H", "baseScore": 8.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - Exploitation requires loading and attaching a sleepable BPF LSM program via bpf() syscalls; per kernel CNA guidance BPF subsystem issues are Local even though inet_conn_established fires during TCP receive processing.\nAC:L - Once a sleepable BPF LSM program is attached, the attacker reliably triggers the bug by making outbound TCP connections (inet_conn_established in softirq) or accessing /proc entries (task_to_inode under rcu_read_lock) without race-dependent conditions.\nPR:L - Loading BPF_PROG_TYPE_LSM programs requires CAP_BPF and CAP_PERFMON, both obtainable by an unprivileged user inside a user namespace (unshare -Ur) on typical Linux deployments with CONFIG_BPF_LSM enabled.\nUI:N - No victim user interaction is required; triggering occurs automatically from normal outbound TCP handshakes or /proc filesystem access after the sleepable BPF program is loaded.\nS:C - A container tenant with namespace CAP_BPF can load a sleepable BPF LSM on inet_conn_established or task_to_inode, and hook execution in host kernel softirq/RCU context can crash or corrupt the entire host, crossing the container-to-host security boundary.\nC:H - Executing sleepable BPF helpers (e.g. bpf_copy_from_user, GFP_KERNEL allocations) inside rcu_read_lock or softirq can corrupt kernel memory before detection, and such context violations are classifiable as exploitable memory-safety failures.\nI:H - Sleeping while holding TCP stack or RCU-protected locks can corrupt kernel data structures and potentially be leveraged for arbitrary kernel write or control-flow hijack, not merely a clean crash.\nA:H - Invoking might_sleep operations from softirq or RCU-critical sections reliably causes kernel BUG/oops/panic (\"sleeping function called from invalid context\"), producing complete host denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/bpf_lsm.c" ], "versions": [ { "version": "423f16108c9d832bd96059d5c882c8ef6d76eb96", "lessThan": "452a927cddcd67478d030e646f41cb904a93156f", "status": "affected", "versionType": "git" }, { "version": "423f16108c9d832bd96059d5c882c8ef6d76eb96", "lessThan": "f0fc2a9828171205244a28013f02889f50b71c9f", "status": "affected", "versionType": "git" }, { "version": "423f16108c9d832bd96059d5c882c8ef6d76eb96", "lessThan": "26b380a3ca0b605fd8860995ed6a208f276dd316", "status": "affected", "versionType": "git" }, { "version": "423f16108c9d832bd96059d5c882c8ef6d76eb96", "lessThan": "0d918263c9bfc86078edb2e2f7302a0c6ce42b7c", "status": "affected", "versionType": "git" }, { "version": "423f16108c9d832bd96059d5c882c8ef6d76eb96", "lessThan": "281f2a214565a5cbf8b7355a65738d80bd19b8c5", "status": "affected", "versionType": "git" }, { "version": "423f16108c9d832bd96059d5c882c8ef6d76eb96", "lessThan": "989f1b93907de1753a814996222da375f07e579b", "status": "affected", "versionType": "git" }, { "version": "423f16108c9d832bd96059d5c882c8ef6d76eb96", "lessThan": "beaf0e96b1da74549a6cabd040f9667d83b2e97e", "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/bpf/bpf_lsm.c" ], "versions": [ { "version": "5.11", "status": "affected" }, { "version": "0", "lessThan": "5.11", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.209", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.175", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.141", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "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": "5.11", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.6.141" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.11", "versionEndExcluding": "7.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/452a927cddcd67478d030e646f41cb904a93156f" }, { "url": "https://git.kernel.org/stable/c/f0fc2a9828171205244a28013f02889f50b71c9f" }, { "url": "https://git.kernel.org/stable/c/26b380a3ca0b605fd8860995ed6a208f276dd316" }, { "url": "https://git.kernel.org/stable/c/0d918263c9bfc86078edb2e2f7302a0c6ce42b7c" }, { "url": "https://git.kernel.org/stable/c/281f2a214565a5cbf8b7355a65738d80bd19b8c5" }, { "url": "https://git.kernel.org/stable/c/989f1b93907de1753a814996222da375f07e579b" }, { "url": "https://git.kernel.org/stable/c/beaf0e96b1da74549a6cabd040f9667d83b2e97e" } ], "title": "bpf: Drop task_to_inode and inet_conn_established from lsm sleepable hooks", "x_generator": { "engine": "bippy-1.2.0" } } } }