{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-35898", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-35898" ], "published": "2024-05-19T08:35:32Z", "summary": "netfilter: nf_tables: Fix potential data-race in __nft_flowtable_type_get()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: Fix potential data-race in __nft_flowtable_type_get()\n\nnft_unregister_flowtable_type() within nf_flow_inet_module_exit() can\nconcurrent with __nft_flowtable_type_get() within nf_tables_newflowtable().\nAnd thhere is not any protection when iterate over nf_tables_flowtables\nlist in __nft_flowtable_type_get(). Therefore, there is pertential\ndata-race of nf_tables_flowtables list entry.\n\nUse list_for_each_entry_rcu() to iterate over nf_tables_flowtables list\nin __nft_flowtable_type_get(), and use rcu_read_lock() in the caller\nnft_flowtable_type_get() to protect the entire type query process.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", 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"ccf1586ad0663fa91238ac56abf6340d6d740d18", "upstream_version": "6.1.58", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.1.85" }, "1:6.1.63-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.63", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.85" }, "1:6.1.73-1+rpt1": { "linux_commit": null, "upstream_version": "6.1.73", "assessment": "upstream version (no usable Linux commit)", "upstream_fixed": "6.1.85" }, "1:6.6.20-1+rpt1": { "linux_commit": "6f16847710cc0502450788b9f12f0a14d3429668", "upstream_version": "6.6.20", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.26" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-35898" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/69d1fe14a680042ec913f22196b58e2c8ff1b007" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a347bc8e6251eaee4b619da28020641eb5b0dd77" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/940d41caa71f0d3a52df2fde5fada524a993e331" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/2485bcfe05ee3cf9ca8923a94fa2e456924c79c8" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/9b5b7708ec2be21dd7ef8ca0e3abe4ae9f3b083b" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/8b891153b2e4dc0ca9d9dab8f619d49c740813df" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/e684b1674fd1ca4361812a491242ae871d6b2859" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/24225011d81b471acc0e1e315b7d9905459a6304" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.0, "cvss_v3_severity": "High", "scenario": "AV:L - The vulnerable code is reached through the nfnetlink/nftables netlink socket interface (NFT_MSG_NEWFLOWTABLE batch message), which requires local system access. Per kernel scoring guidance, netfilter/nftables netlink paths are Local.\nAC:H - The attacker fully controls the reader side by spamming NFT_MSG_NEWFLOWTABLE, but the writer side is `nft_unregister_flowtable_type()`, reachable only from `nf_flow_inet_module_exit()` \u2014 i.e. an `rmmod` requiring real CAP_SYS_MODULE in the init namespace, which an unprivileged attacker cannot influence. Winning the window between latching `type` and `try_module_get(type->owner)` therefore depends on a privileged event outside attacker control.\nPR:L - `nfnetlink_rcv()` checks `netlink_net_capable(skb, CAP_NET_ADMIN)`, which evaluates against `sock_net(sk)->user_ns`, so an unprivileged user obtains the needed capability with `unshare -Urn`. No real root is required on the attacker's side of the race.\nUI:N - Exploitation requires only that the attacker issue netlink requests in a loop; no victim opens a file, mounts a filesystem, or otherwise participates. The concurrent administrative module unload is accounted for in Attack Complexity, not User Interaction.\nS:U - The race, the dangling pointer, and its consequences are all confined to the kernel's own security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The unprotected traversal yields a dangling `struct nf_flowtable_type *` into freed module memory, which is then dereferenced (`type->family`, `type->owner`) and chased into `struct module` inside `try_module_get()`. Per kernel guidance a use-after-free is scored High, since reclaimed memory contents become readable through the stale pointer.\nI:H - `try_module_get()` performs `atomic_inc_not_zero(&module->refcnt)` through a pointer read from freed memory, and on success `nf_tables_newflowtable()` stores the stale `type` and invokes `type->init()` while `nft_flowtable_parse_hook()` installs `type->hook` as a live packet-processing callback \u2014 a control-flow hijack primitive if the module region is reclaimed. Use-after-free with function-pointer dereference is High integrity impact.\nA:H - Module memory is released via `execmem_free()`, so dereferencing the stale `type` typically faults on unmapped kernel address space, producing an oops/panic. Any use-after-free of this kind is scored High availability impact." } } }