CVE-2022-49325

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2022-49325", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.538Z", "datePublished": "2025-02-26T02:10:48.158Z", "dateUpdated": "2026-08-05T08:54:43.711Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:54:43.711Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: add accessors to read/set tp->snd_cwnd\n\nWe had various bugs over the years with code\nbreaking the assumption that tp->snd_cwnd is greater\nthan zero.\n\nLately, syzbot reported the WARN_ON_ONCE(!tp->prior_cwnd) added\nin commit 8b8a321ff72c (\"tcp: fix zero cwnd in tcp_cwnd_reduction\")\ncan trigger, and without a repro we would have to spend\nconsiderable time finding the bug.\n\nInstead of complaining too late, we want to catch where\nand when tp->snd_cwnd is set to an illegal value."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - Zero snd_cwnd arises in TCP congestion/MTU-probe paths reached from tcp_rcv_established \u2192 tcp_ack \u2192 tcp_clean_rtx_queue while processing inbound ACKs, so a remote TCP peer triggers it via ordinary network packets.\nAC:L - A remote peer on a data-heavy connection can shrink cwnd (loss/ECN) and deliver the ACKs that enter cwnd-reduction or probe-success; those peer-side conditions are attacker-controlled, and MTU probing is enabled in realistic deployments.\nPR:N - Exploitation requires only exchanging TCP segments on an established connection to a listening service; no authentication or local privileges are needed.\nUI:N - No victim user action is required beyond an already-running TCP endpoint that sends data and processes peer ACKs.\nS:U - Impact stays within the host kernel TCP/congestion-control authority with no VM escape, IOMMU bypass, or other cross-boundary scope change.\nC:N - The defect only allows snd_cwnd to become zero and trip assertions/divides; it does not corrupt memory or disclose kernel or user data.\nI:N - There is no write primitive, type confusion, or control-flow hijack\u2014only an illegal congestion-window value leading to WARN/div0/BUG paths.\nA:H - Zero snd_cwnd triggers WARN_ON_ONCE(!prior_cwnd), BUG_ON(cwnd <= in_flight), and divide-by-zero in congestion control, causing kernel oops/panic and full host DoS."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/tcp.h", "include/trace/events/tcp.h", "net/core/filter.c", "net/ipv4/tcp.c", "net/ipv4/tcp_bbr.c", "net/ipv4/tcp_bic.c", "net/ipv4/tcp_cdg.c", "net/ipv4/tcp_cong.c", "net/ipv4/tcp_cubic.c", "net/ipv4/tcp_dctcp.c", "net/ipv4/tcp_highspeed.c", "net/ipv4/tcp_htcp.c", "net/ipv4/tcp_hybla.c", "net/ipv4/tcp_illinois.c", "net/ipv4/tcp_input.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_lp.c", "net/ipv4/tcp_metrics.c", "net/ipv4/tcp_nv.c", "net/ipv4/tcp_output.c", "net/ipv4/tcp_rate.c", "net/ipv4/tcp_scalable.c", "net/ipv4/tcp_vegas.c", "net/ipv4/tcp_veno.c", "net/ipv4/tcp_westwood.c", "net/ipv4/tcp_yeah.c", "net/ipv6/tcp_ipv6.c"], "versions": [{"version": "5d424d5a674f782d0659a3b66d951f412901faee", "lessThan": "3308676ec525901bf1656014003c443a60730a04", "status": "affected", "versionType": "git"}, {"version": "5d424d5a674f782d0659a3b66d951f412901faee", "lessThan": "5aba0ad44fb4a7fb78c5076c313456de199a3c29", "status": "affected", "versionType": "git"}, {"version": "5d424d5a674f782d0659a3b66d951f412901faee", "lessThan": "41e191fe72282e193a7744e2fc1786b23156c9e4", "status": "affected", "versionType": "git"}, {"version": "5d424d5a674f782d0659a3b66d951f412901faee", "lessThan": "40570375356c874b1578e05c1dcc3ff7c1322dbe", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/tcp.h", "include/trace/events/tcp.h", "net/core/filter.c", "net/ipv4/tcp.c", "net/ipv4/tcp_bbr.c", "net/ipv4/tcp_bic.c", "net/ipv4/tcp_cdg.c", "net/ipv4/tcp_cong.c", "net/ipv4/tcp_cubic.c", "net/ipv4/tcp_dctcp.c", "net/ipv4/tcp_highspeed.c", "net/ipv4/tcp_htcp.c", "net/ipv4/tcp_hybla.c", "net/ipv4/tcp_illinois.c", "net/ipv4/tcp_input.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_lp.c", "net/ipv4/tcp_metrics.c", "net/ipv4/tcp_nv.c", "net/ipv4/tcp_output.c", "net/ipv4/tcp_rate.c", "net/ipv4/tcp_scalable.c", "net/ipv4/tcp_vegas.c", "net/ipv4/tcp_veno.c", "net/ipv4/tcp_westwood.c", "net/ipv4/tcp_yeah.c", "net/ipv6/tcp_ipv6.c"], "versions": [{"version": "2.6.17", "status": "affected"}, {"version": "0", "lessThan": "2.6.17", "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": "2.6.17", "versionEndExcluding": "5.15.47"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.17", "versionEndExcluding": "5.17.15"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.17", "versionEndExcluding": "5.18.4"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.17", "versionEndExcluding": "5.19"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/3308676ec525901bf1656014003c443a60730a04"}, {"url": "https://git.kernel.org/stable/c/5aba0ad44fb4a7fb78c5076c313456de199a3c29"}, {"url": "https://git.kernel.org/stable/c/41e191fe72282e193a7744e2fc1786b23156c9e4"}, {"url": "https://git.kernel.org/stable/c/40570375356c874b1578e05c1dcc3ff7c1322dbe"}], "title": "tcp: add accessors to read/set tp->snd_cwnd", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["include/net/tcp.h", "include/trace/events/tcp.h", "net/core/filter.c", "net/ipv4/tcp.c", "net/ipv4/tcp_bbr.c", "net/ipv4/tcp_bic.c", "net/ipv4/tcp_cdg.c", "net/ipv4/tcp_cong.c", "net/ipv4/tcp_cubic.c", "net/ipv4/tcp_dctcp.c", "net/ipv4/tcp_highspeed.c", "net/ipv4/tcp_htcp.c", "net/ipv4/tcp_hybla.c", "net/ipv4/tcp_illinois.c", "net/ipv4/tcp_input.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_lp.c", "net/ipv4/tcp_metrics.c", "net/ipv4/tcp_nv.c", "net/ipv4/tcp_output.c", "net/ipv4/tcp_rate.c", "net/ipv4/tcp_scalable.c", "net/ipv4/tcp_vegas.c", "net/ipv4/tcp_veno.c", "net/ipv4/tcp_westwood.c", "net/ipv4/tcp_yeah.c", "net/ipv6/tcp_ipv6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "3308676ec525901bf1656014003c443a60730a04", "status": "affected", "version": "5d424d5a674f782d0659a3b66d951f412901faee", "versionType": "git"}, {"lessThan": "5aba0ad44fb4a7fb78c5076c313456de199a3c29", "status": "affected", "version": "5d424d5a674f782d0659a3b66d951f412901faee", "versionType": "git"}, {"lessThan": "41e191fe72282e193a7744e2fc1786b23156c9e4", "status": "affected", "version": "5d424d5a674f782d0659a3b66d951f412901faee", "versionType": "git"}, {"lessThan": "40570375356c874b1578e05c1dcc3ff7c1322dbe", "status": "affected", "version": "5d424d5a674f782d0659a3b66d951f412901faee", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["include/net/tcp.h", "include/trace/events/tcp.h", "net/core/filter.c", "net/ipv4/tcp.c", "net/ipv4/tcp_bbr.c", "net/ipv4/tcp_bic.c", "net/ipv4/tcp_cdg.c", "net/ipv4/tcp_cong.c", "net/ipv4/tcp_cubic.c", "net/ipv4/tcp_dctcp.c", "net/ipv4/tcp_highspeed.c", "net/ipv4/tcp_htcp.c", "net/ipv4/tcp_hybla.c", "net/ipv4/tcp_illinois.c", "net/ipv4/tcp_input.c", "net/ipv4/tcp_ipv4.c", "net/ipv4/tcp_lp.c", "net/ipv4/tcp_metrics.c", "net/ipv4/tcp_nv.c", "net/ipv4/tcp_output.c", "net/ipv4/tcp_rate.c", "net/ipv4/tcp_scalable.c", "net/ipv4/tcp_vegas.c", "net/ipv4/tcp_veno.c", "net/ipv4/tcp_westwood.c", "net/ipv4/tcp_yeah.c", "net/ipv6/tcp_ipv6.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.17"}, {"lessThan": "2.6.17", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.47", "versionType": "semver"}, {"lessThanOrEqual": "5.17.*", "status": "unaffected", "version": "5.17.15", "versionType": "semver"}, {"lessThanOrEqual": "5.18.*", "status": "unaffected", "version": "5.18.4", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "5.19", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "30EAD0EB-B3D1-4A88-A3D8-4F8242E81A01", "versionEndExcluding": "5.15.47", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "53E7AA2E-2FB4-45CA-A22B-08B4EDBB51AD", "versionEndExcluding": "5.17.15", "versionStartIncluding": "5.16", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "FA6D643C-6D6A-4821-8A8D-B5776B8F0103", "versionEndExcluding": "5.18.4", "versionStartIncluding": "5.18", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: add accessors to read/set tp->snd_cwnd\n\nWe had various bugs over the years with code\nbreaking the assumption that tp->snd_cwnd is greater\nthan zero.\n\nLately, syzbot reported the WARN_ON_ONCE(!tp->prior_cwnd) added\nin commit 8b8a321ff72c (\"tcp: fix zero cwnd in tcp_cwnd_reduction\")\ncan trigger, and without a repro we would have to spend\nconsiderable time finding the bug.\n\nInstead of complaining too late, we want to catch where\nand when tp->snd_cwnd is set to an illegal value."}, {"lang": "es", "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tcp: agregar descriptores de acceso para leer/establecer tp-&gt;snd_cwnd Tuvimos varios errores a lo largo de los a\u00f1os con c\u00f3digo que romp\u00eda la suposici\u00f3n de que tp-&gt;snd_cwnd es mayor que cero. \u00daltimamente, syzbot inform\u00f3 que se puede activar WARN_ON_ONCE(!tp-&gt;prior_cwnd) agregado en el commit 8b8a321ff72c (\"tcp: corregir cwnd cero en tcp_cwnd_reduction\"), y sin una reproducci\u00f3n tendr\u00edamos que dedicar un tiempo considerable a encontrar el error. En lugar de quejarnos demasiado tarde, queremos detectar d\u00f3nde y cu\u00e1ndo tp-&gt;snd_cwnd se establece en un valor ilegal."}], "id": "CVE-2022-49325", "lastModified": "2026-08-04T10:17:44.163", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-02-26T07:01:09.323", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/3308676ec525901bf1656014003c443a60730a04"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/40570375356c874b1578e05c1dcc3ff7c1322dbe"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/41e191fe72282e193a7744e2fc1786b23156c9e4"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5aba0ad44fb4a7fb78c5076c313456de199a3c29"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-617"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2022:8267", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}, {"advisory": "RHSA-2022:8267", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-162.6.1.el9_1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2022-11-15T00:00:00Z"}], "bugzilla": {"description": "kernel: tcp: add accessors to read/set tp->snd_cwnd", "id": "2348023", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2348023"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-99", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntcp: add accessors to read/set tp->snd_cwnd\nWe had various bugs over the years with code\nbreaking the assumption that tp->snd_cwnd is greater\nthan zero.\nLately, syzbot reported the WARN_ON_ONCE(!tp->prior_cwnd) added\nin commit 8b8a321ff72c (\"tcp: fix zero cwnd in tcp_cwnd_reduction\")\ncan trigger, and without a repro we would have to spend\nconsiderable time finding the bug.\nInstead of complaining too late, we want to catch where\nand when tp->snd_cwnd is set to an illegal value."], "name": "CVE-2022-49325", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-02-26T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49325\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49325\nhttps://lore.kernel.org/linux-cve-announce/2025022638-CVE-2022-49325-a2ac@gregkh/T"], "threat_severity": "Moderate"}

{}