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vuln-cve/data/2022/49xxx/CVE-2022-49372.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2022-49372",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-02-26T02:08:31.555Z",
"datePublished": "2025-02-26T02:11:14.119Z",
"dateUpdated": "2026-05-11T18:58:24.878Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-11T18:58:24.878Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: tcp_rtx_synack() can be called from process context\n\nLaurent reported the enclosed report [1]\n\nThis bug triggers with following coditions:\n\n0) Kernel built with CONFIG_DEBUG_PREEMPT=y\n\n1) A new passive FastOpen TCP socket is created.\n This FO socket waits for an ACK coming from client to be a complete\n ESTABLISHED one.\n2) A socket operation on this socket goes through lock_sock()\n release_sock() dance.\n3) While the socket is owned by the user in step 2),\n a retransmit of the SYN is received and stored in socket backlog.\n4) At release_sock() time, the socket backlog is processed while\n in process context.\n5) A SYNACK packet is cooked in response of the SYN retransmit.\n6) -> tcp_rtx_synack() is called in process context.\n\nBefore blamed commit, tcp_rtx_synack() was always called from BH handler,\nfrom a timer handler.\n\nFix this by using TCP_INC_STATS() & NET_INC_STATS()\nwhich do not assume caller is in non preemptible context.\n\n[1]\nBUG: using __this_cpu_add() in preemptible [00000000] code: epollpep/2180\ncaller is tcp_rtx_synack.part.0+0x36/0xc0\nCPU: 10 PID: 2180 Comm: epollpep Tainted: G OE 5.16.0-0.bpo.4-amd64 #1 Debian 5.16.12-1~bpo11+1\nHardware name: Supermicro SYS-5039MC-H8TRF/X11SCD-F, BIOS 1.7 11/23/2021\nCall Trace:\n <TASK>\n dump_stack_lvl+0x48/0x5e\n check_preemption_disabled+0xde/0xe0\n tcp_rtx_synack.part.0+0x36/0xc0\n tcp_rtx_synack+0x8d/0xa0\n ? kmem_cache_alloc+0x2e0/0x3e0\n ? apparmor_file_alloc_security+0x3b/0x1f0\n inet_rtx_syn_ack+0x16/0x30\n tcp_check_req+0x367/0x610\n tcp_rcv_state_process+0x91/0xf60\n ? get_nohz_timer_target+0x18/0x1a0\n ? lock_timer_base+0x61/0x80\n ? preempt_count_add+0x68/0xa0\n tcp_v4_do_rcv+0xbd/0x270\n __release_sock+0x6d/0xb0\n release_sock+0x2b/0x90\n sock_setsockopt+0x138/0x1140\n ? __sys_getsockname+0x7e/0xc0\n ? aa_sk_perm+0x3e/0x1a0\n __sys_setsockopt+0x198/0x1e0\n __x64_sys_setsockopt+0x21/0x30\n do_syscall_64+0x38/0xc0\n entry_SYSCALL_64_after_hwframe+0x44/0xae"
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/ipv4/tcp_output.c"
],
"versions": [
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "3db889f883e65bbd3b1401279bfc1e9ed255c481",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "c348b0f8d035fc4bdc040796889beec7218bd1b8",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "58bd38cbc961fd799842b7be8c5222310f04b908",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "d05c2fdf8e10528bb6751bd95243e862d5402a9b",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "0a0f7f84148445c9f02f226928803a870139d820",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "88cd232146207ff1d41dededed5e77c0d4438113",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "bdc28a8fb43cc476e33b11519235adb816ce00e8",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "d8e1bc6029acac796293310aacef7b7336f35b6a",
"status": "affected",
"versionType": "git"
},
{
"version": "168a8f58059a22feb9e9a2dcc1b8053dbbbc12ef",
"lessThan": "0a375c822497ed6ad6b5da0792a12a6f1af10c0b",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/ipv4/tcp_output.c"
],
"versions": [
{
"version": "3.7",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.7",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.9.318",
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.14.283",
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "4.19.247",
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.4.198",
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.122",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.47",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.17.15",
"lessThanOrEqual": "5.17.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.18.4",
"lessThanOrEqual": "5.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.19",
"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": "3.7",
"versionEndExcluding": "4.9.318"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "4.14.283"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "4.19.247"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "5.4.198"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "5.10.122"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "5.15.47"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "5.17.15"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "5.18.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.7",
"versionEndExcluding": "5.19"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/3db889f883e65bbd3b1401279bfc1e9ed255c481"
},
{
"url": "https://git.kernel.org/stable/c/c348b0f8d035fc4bdc040796889beec7218bd1b8"
},
{
"url": "https://git.kernel.org/stable/c/58bd38cbc961fd799842b7be8c5222310f04b908"
},
{
"url": "https://git.kernel.org/stable/c/d05c2fdf8e10528bb6751bd95243e862d5402a9b"
},
{
"url": "https://git.kernel.org/stable/c/0a0f7f84148445c9f02f226928803a870139d820"
},
{
"url": "https://git.kernel.org/stable/c/88cd232146207ff1d41dededed5e77c0d4438113"
},
{
"url": "https://git.kernel.org/stable/c/bdc28a8fb43cc476e33b11519235adb816ce00e8"
},
{
"url": "https://git.kernel.org/stable/c/d8e1bc6029acac796293310aacef7b7336f35b6a"
},
{
"url": "https://git.kernel.org/stable/c/0a375c822497ed6ad6b5da0792a12a6f1af10c0b"
}
],
"title": "tcp: tcp_rtx_synack() can be called from process context",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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