{ "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 \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" } } } }