{
  "cveId": "CVE-2025-39950",
  "url": "https://patchblox.com/security/cve/CVE-2025-39950",
  "summary": "CVE-2025-39950 is fixed in 13 products on 1 platform, first by DEBIAN-CVE-2025-39950, released October 4, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net/tcp: Fix a NULL pointer dereference when usi...",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/tcp: Fix a NULL pointer dereference when using TCP-AO with TCP_REPAIR  A NULL pointer dereference can occur in tcp_ao_finish_connect() during a connect() system call on a socket with a TCP-AO key added and TCP_REPAIR enabled.  The function is called with skb being NULL and attempts to dereference it on tcp_hdr(skb)-\u003Eseq without a prior skb validation.  Fix this by checking if skb is NULL before dereferencing it.  The commentary is taken from bpf_skops_established(), which is also called in the same flow. Unlike the function being patched, bpf_skops_established() validates the skb before dereferencing it.  int main(void){ \tstruct sockaddr_in sockaddr; \tstruct tcp_ao_add tcp_ao; \tint sk; \tint one = 1;  \tmemset(\u0026sockaddr,\u0027\\0\u0027,sizeof(sockaddr)); \tmemset(\u0026tcp_ao,\u0027\\0\u0027,sizeof(tcp_ao));  \tsk = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);  \tsockaddr.sin_family = AF_INET;  \tmemcpy(tcp_ao.alg_name,\u0022cmac(aes128)\u0022,12); \tmemcpy(tcp_ao.key,\u0022ABCDEFGHABCDEFGH\u0022,16); \ttcp_ao.keylen = 16;  \tmemcpy(\u0026tcp_ao.addr,\u0026sockaddr,sizeof(sockaddr));  \tsetsockopt(sk, IPPROTO_TCP, TCP_AO_ADD_KEY, \u0026tcp_ao, \tsizeof(tcp_ao)); \tsetsockopt(sk, IPPROTO_TCP, TCP_REPAIR, \u0026one, sizeof(one));  \tsockaddr.sin_family = AF_INET; \tsockaddr.sin_port = htobe16(123);  \tinet_aton(\u0022127.0.0.1\u0022, \u0026sockaddr.sin_addr);  \tconnect(sk,(struct sockaddr *)\u0026sockaddr,sizeof(sockaddr));  return 0; }  $ gcc tcp-ao-nullptr.c -o tcp-ao-nullptr -Wall $ unshare -Urn  BUG: kernel NULL pointer dereference, address: 00000000000000b6 PGD 1f648d067 P4D 1f648d067 PUD 1982e8067 PMD 0 Oops: Oops: 0000 [#1] SMP NOPTI Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 11/12/2020 RIP: 0010:tcp_ao_finish_connect (net/ipv4/tcp_ao.c:1182)",
  "published": "2025-10-04T08:15:48Z",
  "severity": "medium",
  "cvss": 5.5,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.0015,
  "epssPercentile": 0.04157,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dtb-aarch64",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-64kb",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-default",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-default",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-default-base",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.6.1.160000.2.4",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
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      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-docs",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-docs",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-kvmsmall",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
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      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-obs-build",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-obs-qa",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-obs-qa",
      "release": "sles 16.0",
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      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-rt",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-source",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-source",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
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      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
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      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "kernel-zfcpdump",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "OPENSUSE-SU-2025:20091-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2025-20091-1",
      "released": "2025-11-26T17:04:24Z"
    },
    {
      "platform": "linux",
      "product": "kernel-zfcpdump",
      "release": "sles 16.0",
      "fixedVersion": "6.12.0-160000.7.1",
      "fix": "SUSE-SU-2025:21147-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2025-21147-1",
      "released": "2025-11-26T15:59:00Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.57-1",
      "fix": "DEBIAN-CVE-2025-39950",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39950",
      "released": "2025-10-04T08:15:48Z"
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    {
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      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-39950",
      "released": "2025-10-04T08:15:48Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}