{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50536", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-10-07T15:15:38.666Z", "datePublished": "2025-10-07T15:21:03.056Z", "dateUpdated": "2026-08-05T08:59:05.133Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:05.133Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf, sockmap: Fix repeated calls to sock_put() when msg has more_data\n\nIn tcp_bpf_send_verdict() redirection, the eval variable is assigned to\n__SK_REDIRECT after the apply_bytes data is sent, if msg has more_data,\nsock_put() will be called multiple times.\n\nWe should reset the eval variable to __SK_NONE every time more_data\nstarts.\n\nThis causes:\n\nIPv4: Attempt to release TCP socket in state 1 00000000b4c925d7\n------------[ cut here ]------------\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 5 PID: 4482 at lib/refcount.c:25 refcount_warn_saturate+0x7d/0x110\nModules linked in:\nCPU: 5 PID: 4482 Comm: sockhash_bypass Kdump: loaded Not tainted 6.0.0 #1\nHardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014\nCall Trace:\n \n __tcp_transmit_skb+0xa1b/0xb90\n ? __alloc_skb+0x8c/0x1a0\n ? __kmalloc_node_track_caller+0x184/0x320\n tcp_write_xmit+0x22a/0x1110\n __tcp_push_pending_frames+0x32/0xf0\n do_tcp_sendpages+0x62d/0x640\n tcp_bpf_push+0xae/0x2c0\n tcp_bpf_sendmsg_redir+0x260/0x410\n ? preempt_count_add+0x70/0xa0\n tcp_bpf_send_verdict+0x386/0x4b0\n tcp_bpf_sendmsg+0x21b/0x3b0\n sock_sendmsg+0x58/0x70\n __sys_sendto+0xfa/0x170\n ? xfd_validate_state+0x1d/0x80\n ? switch_fpu_return+0x59/0xe0\n __x64_sys_sendto+0x24/0x30\n do_syscall_64+0x37/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd" } ], "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 only via local sendto/sendmsg on a TCP socket enrolled in a BPF sockmap/sockhash with an SK_MSG redirect program (tcp_bpf_sendmsg → tcp_bpf_send_verdict); SK_MSG processes locally sent data, not remote peer packets.\nAC:L - The attacker controls the SK_MSG apply_bytes/redirect policy and the send size that forces the more_data loop, so the extra sock_put and resulting socket UAF are deterministic with no race or uncontrolled layout.\nPR:L - Sockmap/SK_MSG setup needs CAP_NET_ADMIN/CAP_BPF, but those are routinely held by networking containers and delegated via BPF tokens; once a sockmap redirect path exists (e.g. service-mesh/sockops), an ordinary unprivileged send on an enrolled socket triggers the bug.\nUI:N - The attacker performs map/program setup (or relies on an existing deployment) and the triggering sendmsg themselves; no victim action is required.\nS:U - The socket refcount underflow and use-after-free remain inside the host kernel's security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Repeated sock_put() underflows the redirect socket's refcount and frees struct sock while it is still used, enabling heap reuse of the freed socket and arbitrary kernel memory disclosure per UAF guidance.\nI:H - A use-after-free on struct sock (sk_prot, callbacks, sk_redir) is heap-sprayable into write and control-flow hijack primitives, matching High integrity impact for UAF memory corruption.\nA:H - The bug produces refcount_t use-after-free warnings and kernel oops/panic on the freed socket path, and any UAF is scored High availability even when not fully weaponized." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/tcp_bpf.c" ], "versions": [ { "version": "5f0bfe21c853917aae4bc5a70fe57ddb4054443e", "lessThan": "7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10", "status": "affected", "versionType": "git" }, { "version": "15dec6d8f8642a26d6a272af2d7f9877df8f02b8", "lessThan": "28e4a763cd4a2b1a78852216ef4bd7df3a05cec6", "status": "affected", "versionType": "git" }, { "version": "cd9733f5d75c94a32544d6ce5be47e14194cf137", "lessThan": "8786bde11a4f31b63b3036731df0b47337a7a245", "status": "affected", "versionType": "git" }, { "version": "cd9733f5d75c94a32544d6ce5be47e14194cf137", "lessThan": "578a7628b838a3ac8ad61deaab5a816ff032ac13", "status": "affected", "versionType": "git" }, { "version": "cd9733f5d75c94a32544d6ce5be47e14194cf137", "lessThan": "113236e8f49f262f318c00ebb14b15f4834e87c1", "status": "affected", "versionType": "git" }, { "version": "cd9733f5d75c94a32544d6ce5be47e14194cf137", "lessThan": "7a9841ca025275b5b0edfb0b618934abb6ceec15", "status": "affected", "versionType": "git" }, { "version": "6f226ffe4458ea3b8c33287cb8c86f87dc198dce", "status": "affected", "versionType": "git" }, { "version": "5.4.157", "lessThan": "5.4.229", "status": "affected", "versionType": "semver" }, { "version": "5.10.77", "lessThan": "5.10.163", "status": "affected", "versionType": "semver" }, { "version": "5.14.16", "lessThan": "5.15", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/tcp_bpf.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.229", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.163", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.86", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.16", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.2", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.2", "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": "5.4.157", "versionEndExcluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10.77", "versionEndExcluding": "5.10.163" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "5.15.86" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.0.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.14.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/7508b9f4daac4ec7dfe0b6fb2d688b1c1c105e10" }, { "url": "https://git.kernel.org/stable/c/28e4a763cd4a2b1a78852216ef4bd7df3a05cec6" }, { "url": "https://git.kernel.org/stable/c/8786bde11a4f31b63b3036731df0b47337a7a245" }, { "url": "https://git.kernel.org/stable/c/578a7628b838a3ac8ad61deaab5a816ff032ac13" }, { "url": "https://git.kernel.org/stable/c/113236e8f49f262f318c00ebb14b15f4834e87c1" }, { "url": "https://git.kernel.org/stable/c/7a9841ca025275b5b0edfb0b618934abb6ceec15" } ], "title": "bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data", "x_generator": { "engine": "bippy-1.2.0" } } } }