{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50865", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-30T12:06:07.136Z", "datePublished": "2025-12-30T12:15:37.150Z", "dateUpdated": "2026-08-05T08:59:52.038Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:52.038Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: fix a signed-integer-overflow bug in tcp_add_backlog()\n\nThe type of sk_rcvbuf and sk_sndbuf in struct sock is int, and\nin tcp_add_backlog(), the variable limit is caculated by adding\nsk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value\nof int and overflow. This patch reduces the limit budget by\nhalving the sndbuf to solve this issue since ACK packets are much\nsmaller than the payload." } ], "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 - tcp_add_backlog() runs on the TCP receive path from tcp_v4_rcv/tcp_v6_rcv when processing inbound segments for an established socket owned by userspace, so a remote peer reaches it via ordinary network packets.\nAC:L - In a realistic high-throughput deployment with rmem_max/wmem_max raised near INT_MAX and the application setting large SO_RCVBUF/SO_SNDBUF, a peer can reliably drive the overflowed tiny backlog limit by sending data while the socket is locked; no attacker-uncontrollable race or rare config is required.\nPR:N - Triggering the buggy limit check needs only the ability to send TCP segments to an existing connection; no authentication or local privileges are required of the remote attacker.\nUI:N - Exploitation does not require any victim user action beyond the already-running TCP service accepting and processing network traffic.\nS:U - Impact stays within the host kernel networking authority; there is no VM escape, sandbox escape, or other cross-boundary scope change.\nC:N - The overflow only miscomputes the backlog admission limit; it does not corrupt memory or disclose kernel/user data.\nI:N - There is no write primitive, type confusion, or other integrity violation—only an incorrect (too-small) backlog threshold causing packet drops.\nA:H - When sk_rcvbuf and sk_sndbuf are both near INT_MAX, signed overflow collapses the u32 limit to ~64KB, so sk_add_backlog() prematurely drops inbound segments (TCPBACKLOGDROP), enabling denial of service on affected connections." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/ipv4/tcp_ipv4.c" ], "versions": [ { "version": "c9c3321257e1b95be9b375f811fb250162af8d39", "lessThan": "9d04b4d0feee12bce6bfe37f30d8e953d3c30368", "status": "affected", "versionType": "git" }, { "version": "c9c3321257e1b95be9b375f811fb250162af8d39", "lessThan": "4f23cb2be530785db284a685d1b1c30224d8a538", "status": "affected", "versionType": "git" }, { "version": "c9c3321257e1b95be9b375f811fb250162af8d39", "lessThan": "a85d39f14aa8a71e29cfb5eb5de02878a8779898", "status": "affected", "versionType": "git" }, { "version": "c9c3321257e1b95be9b375f811fb250162af8d39", "lessThan": "28addf029417d53b1df062b4c87feb7bc033cb5f", "status": "affected", "versionType": "git" }, { "version": "c9c3321257e1b95be9b375f811fb250162af8d39", "lessThan": "ec791d8149ff60c40ad2074af3b92a39c916a03f", "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_ipv4.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.278", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.153", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.77", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.7", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "4.9", "versionEndExcluding": "5.4.278" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.10.153" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.77" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/9d04b4d0feee12bce6bfe37f30d8e953d3c30368" }, { "url": "https://git.kernel.org/stable/c/4f23cb2be530785db284a685d1b1c30224d8a538" }, { "url": "https://git.kernel.org/stable/c/a85d39f14aa8a71e29cfb5eb5de02878a8779898" }, { "url": "https://git.kernel.org/stable/c/28addf029417d53b1df062b4c87feb7bc033cb5f" }, { "url": "https://git.kernel.org/stable/c/ec791d8149ff60c40ad2074af3b92a39c916a03f" } ], "title": "tcp: fix a signed-integer-overflow bug in tcp_add_backlog()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-06-16T15:51:41.874254Z", "id": "CVE-2022-50865", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-16T15:51:51.892Z" } } ] } }