{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98382", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.345Z", "datePublished": "2026-10-09T07:34:21.718Z", "dateUpdated": "2026-10-24T14:08:39.904Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:08:39.904Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Reject dev-bound-only programs on other devices\n\n__bpf_offload_dev_match() falls back to comparing offdev pointers after an\nexact netdev mismatch. Bound-only programs normally have NULL offdevs, so\nunrelated netdevs compare equal. A bound-only program on an\noffload-registered netdev can instead inherit a real offdev and match a\nsibling port. With CAP_BPF and CAP_NET_ADMIN, a caller can use\nbpf(BPF_LINK_CREATE) with a different target ifindex to run metadata kfuncs\nspecialized for the bound driver on the target driver's xdp_buff. Running a\nveth-bound program on tun reads beyond tun's bare stack xdp_buff as a\nveth_xdp_buff.\n\n Oops: general protection fault, probably for non-canonical address\n KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]\n RIP: 0010:veth_xdp_rx_timestamp (drivers/net/veth.c:1673)\n Call Trace:\n ...\n tun_build_skb (drivers/net/tun.c:1739)\n tun_get_user (drivers/net/tun.c:1856)\n tun_chr_write_iter (drivers/net/tun.c:2091)\n vfs_write (fs/read_write.c:595 fs/read_write.c:687)\n ksys_write (fs/read_write.c:739)\n do_syscall_64 (arch/x86/entry/syscall_64.c:84)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n Kernel panic - not syncing: Fatal exception in interrupt\n\nRestrict non-offloaded programs to exact netdev matches and retain the\nshared-offdev fallback only for genuinely offloaded multi-port programs." } ], "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 - bpf(BPF_LINK_CREATE) reaches link_create(), bpf_xdp_link_attach(), dev_xdp_install(), and patched __bpf_offload_dev_match(), which accepts a program whose prog_ifindex names another local netdev; no network protocol carries the mismatched ifindex.\nAC:L - The attacker can bind programs to both veth and tun to create their NULL-offdev entries, attach the veth-bound program to tun, and write a packet through tun_chr_write_iter(); the mismatch is deterministic and requires no race or external device state.\nPR:L - bpf_prog_load() requires bpf_token_capable() for CAP_BPF and CAP_NET_ADMIN, which BPF-token delegation can satisfy in a user namespace; tun_set_iff() checks CAP_NET_ADMIN against net->user_ns, permitting this path in delegated container deployments.\nUI:N - The attacker creates the devices, loads and attaches both programs, and triggers execution by writing to their own tun file descriptor; no victim action is involved.\nS:U - The incorrectly specialized metadata kfunc dereferences and can modify memory inside the same host kernel executing the XDP program; no VM, IOMMU, or other separate security authority is crossed.\nC:H - bpf_dev_bound_resolve_kfunc() specializes the call to veth_xdp_rx_timestamp(), which casts tun's bare stack xdp_buff to veth_xdp_buff, treats the adjacent word as an skb pointer, and returns skb_hwtstamps()->hwtstamp to the BPF program, providing an unbounded kernel-read primitive.\nI:H - veth_xdp_rx_hash() passes the same bogus skb pointer to skb_get_hash(); when no hash is present, __skb_get_hash_net() calls __skb_set_sw_hash() and writes hash, l4_hash, and sw_hash through that attacker-influenceable pointer.\nA:H - tun_build_skb() runs the mismatched program from tun_chr_write_iter(), and the demonstrated veth_xdp_rx_timestamp() invalid dereference produces a general-protection fault followed by a kernel panic." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/bpf/offload.c" ], "versions": [ { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "e57f04194361574493e3e6cf0b9e9c69e4ae9791", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "0dceda331180617aeeb22381e8480b37f18ba08b", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "940b626854de200e6187777d42114727daca617c", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "bb375f3c5990e29851894f20ebc4b9dbc6676126", "status": "affected", "versionType": "git" }, { "version": "2b3486bc2d237ec345b3942b7be5deabf8c8fed1", "lessThan": "6db1ce73e9853f533eb7f413f14ba00f8ec6f80d", "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/offload.c" ], "versions": [ { "version": "6.3", "status": "affected" }, { "version": "0", "lessThan": "6.3", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "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": "6.3", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.3", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/e57f04194361574493e3e6cf0b9e9c69e4ae9791" }, { "url": "https://git.kernel.org/stable/c/0dceda331180617aeeb22381e8480b37f18ba08b" }, { "url": "https://git.kernel.org/stable/c/940b626854de200e6187777d42114727daca617c" }, { "url": "https://git.kernel.org/stable/c/bb375f3c5990e29851894f20ebc4b9dbc6676126" }, { "url": "https://git.kernel.org/stable/c/6db1ce73e9853f533eb7f413f14ba00f8ec6f80d" } ], "title": "bpf: Reject dev-bound-only programs on other devices", "x_generator": { "engine": "bippy-1.2.0" } } } }