CVE-2022-50536 (GCVE-0-2022-50536)
Vulnerability from cvelistv5
Published
2025-10-07 15:21
Modified
2026-08-05 08:59
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, sockmap: Fix repeated calls to sock_put() when msg has more_data In tcp_bpf_send_verdict() redirection, the eval variable is assigned to __SK_REDIRECT after the apply_bytes data is sent, if msg has more_data, sock_put() will be called multiple times. We should reset the eval variable to __SK_NONE every time more_data starts. This causes: IPv4: Attempt to release TCP socket in state 1 00000000b4c925d7 ------------[ cut here ]------------ refcount_t: addition on 0; use-after-free. WARNING: CPU: 5 PID: 4482 at lib/refcount.c:25 refcount_warn_saturate+0x7d/0x110 Modules linked in: CPU: 5 PID: 4482 Comm: sockhash_bypass Kdump: loaded Not tainted 6.0.0 #1 Hardware name: Red Hat KVM, BIOS 1.11.0-2.el7 04/01/2014 Call Trace: <TASK> __tcp_transmit_skb+0xa1b/0xb90 ? __alloc_skb+0x8c/0x1a0 ? __kmalloc_node_track_caller+0x184/0x320 tcp_write_xmit+0x22a/0x1110 __tcp_push_pending_frames+0x32/0xf0 do_tcp_sendpages+0x62d/0x640 tcp_bpf_push+0xae/0x2c0 tcp_bpf_sendmsg_redir+0x260/0x410 ? preempt_count_add+0x70/0xa0 tcp_bpf_send_verdict+0x386/0x4b0 tcp_bpf_sendmsg+0x21b/0x3b0 sock_sendmsg+0x58/0x70 __sys_sendto+0xfa/0x170 ? xfd_validate_state+0x1d/0x80 ? switch_fpu_return+0x59/0xe0 __x64_sys_sendto+0x24/0x30 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd
References
Impacted products
Vendor Product Version
Linux Linux Version: 5f0bfe21c853917aae4bc5a70fe57ddb4054443e
Version: 15dec6d8f8642a26d6a272af2d7f9877df8f02b8
Version: cd9733f5d75c94a32544d6ce5be47e14194cf137
Version: cd9733f5d75c94a32544d6ce5be47e14194cf137
Version: cd9733f5d75c94a32544d6ce5be47e14194cf137
Version: cd9733f5d75c94a32544d6ce5be47e14194cf137
Version: 6f226ffe4458ea3b8c33287cb8c86f87dc198dce
Version: 5.4.157   ≤
Version: 5.10.77   ≤
Version: 5.14.16   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "cd9733f5d75c94a32544d6ce5be47e14194cf137",
              "versionType": "git"
            },
            {
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              "version": "6f226ffe4458ea3b8c33287cb8c86f87dc198dce",
              "versionType": "git"
            },
            {
              "lessThan": "5.4.229",
              "status": "affected",
              "version": "5.4.157",
              "versionType": "semver"
            },
            {
              "lessThan": "5.10.163",
              "status": "affected",
              "version": "5.10.77",
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            },
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              "status": "affected",
              "version": "5.14.16",
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/ipv4/tcp_bpf.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "lessThan": "5.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.229",
                  "versionStartIncluding": "5.4.157",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.163",
                  "versionStartIncluding": "5.10.77",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "5.15.86",
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                  "vulnerable": true
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.0.16",
                  "versionStartIncluding": "5.15",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.2",
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                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.2",
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                },
                {
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                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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 \u003cTASK\u003e\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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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 \u2192 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\u0027s security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Repeated sock_put() underflows the redirect socket\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:05.133Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50536",
    "datePublished": "2025-10-07T15:21:03.056Z",
    "dateReserved": "2025-10-07T15:15:38.666Z",
    "dateUpdated": "2026-08-05T08:59:05.133Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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