CVE-2024-42075

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No unusual kernel config is needed since arena.c is built with CONFIG_BPF_SYSCALL.\nPR:L - The trigger (mmap/mremap/fork on an arena map fd) needs no privileges at all, and an fd can be obtained by an unprivileged process via a bpffs pin, since bpf_obj_do_get() gates only on path_permission() and bpf_map_mmap() performs no capability check. Arena map creation itself is reachable by an unprivileged user in a user namespace through a delegated BPF token (bpf_token_capable() uses ns_capable() against token->userns), which is the intended container delegation model shipped in the same release.\nUI:N - The attacking process performs every step itself \u2014 create/obtain the map fd, mmap, then fork or mremap and exit. No action by any other user or victim process is required.\nS:U - The corruption is confined to kernel slab memory and the BPF arena's own bookkeeping, all within the kernel's security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The dangling vma_list pointer is dereferenced after being freed from the kmalloc-32 cache, so an attacker who reclaims the object with a heap spray gets the kernel reading and acting on attacker-shaped data, and the unlink write can be aimed to disclose arbitrary kernel memory. The corrupted arena->vma_list also breaks the liveness check in arena_map_free(), extending the exposure to arena-backed pages.\nI:H - The second arena_vm_close() performs list_del() on freed, attacker-reclaimable memory, giving the classic unlink write-what-where primitive with both the prev and next pointers under attacker control, and then kfree()s the object a second time. Combined, this yields arbitrary kernel memory write and a controlled double free, i.e. a realistic path to privilege escalation.\nA:H - Even without any exploitation attempt, the double free and use-after-free reliably produce slab corruption, list poison dereferences, and kernel panics (immediately so with KASAN, CONFIG_DEBUG_LIST, or CONFIG_LIST_HARDENED). An unprivileged local user can repeat this at will to crash the machine."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/bpf/arena.c"], "versions": [{"version": "317460317a02a1af512697e6e964298dedd8a163", "lessThan": "87496a1b01e8e2e399428c0db25e106f7961d01e", "status": "affected", "versionType": "git"}, {"version": "317460317a02a1af512697e6e964298dedd8a163", "lessThan": "b90d77e5fd784ada62ddd714d15ee2400c28e1cf", "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/arena.c"], "versions": [{"version": "6.9", "status": "affected"}, {"version": "0", "lessThan": "6.9", "status": "unaffected", "versionType": "semver"}, {"version": "6.9.8", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.10", "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": "6.9", "versionEndExcluding": "6.9.8"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.9", "versionEndExcluding": "6.10"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/87496a1b01e8e2e399428c0db25e106f7961d01e"}, {"url": "https://git.kernel.org/stable/c/b90d77e5fd784ada62ddd714d15ee2400c28e1cf"}], "title": "bpf: Fix remap of arena.", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:54:32.802Z"}, "title": "CVE Program Container", "references": [{"url": "https://git.kernel.org/stable/c/87496a1b01e8e2e399428c0db25e106f7961d01e", "tags": ["x_transferred"]}, {"url": "https://git.kernel.org/stable/c/b90d77e5fd784ada62ddd714d15ee2400c28e1cf", "tags": ["x_transferred"]}]}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2024-42075", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-09-10T16:19:30.060305Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:33:57.585Z"}}]}}

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{"bugzilla": {"description": "kernel: bpf: Fix remap of arena.", "id": "2300513", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2300513"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.2", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-416", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nbpf: Fix remap of arena.\nThe bpf arena logic didn't account for mremap operation. Add a refcnt for\nmultiple mmap events to prevent use-after-free in arena_vm_close."], "name": "CVE-2024-42075", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-07-29T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2024-42075\nhttps://nvd.nist.gov/vuln/detail/CVE-2024-42075\nhttps://lore.kernel.org/linux-cve-announce/2024072954-CVE-2024-42075-febc@gregkh/T"], "threat_severity": "Low"}

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