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CVE-2022-49325 (GCVE-0-2022-49325)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:10 – Updated: 2026-08-05 08:54
VLAI
Title
tcp: add accessors to read/set tp->snd_cwnd
Summary
In the Linux kernel, the following vulnerability has been resolved: tcp: add accessors to read/set tp->snd_cwnd We had various bugs over the years with code breaking the assumption that tp->snd_cwnd is greater than zero. Lately, syzbot reported the WARN_ON_ONCE(!tp->prior_cwnd) added in commit 8b8a321ff72c ("tcp: fix zero cwnd in tcp_cwnd_reduction") can trigger, and without a repro we would have to spend considerable time finding the bug. Instead of complaining too late, we want to catch where and when tp->snd_cwnd is set to an illegal value.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5d424d5a674f782d0659a3b66d951f412901faee , < 3308676ec525901bf1656014003c443a60730a04 (git)
Affected: 5d424d5a674f782d0659a3b66d951f412901faee , < 5aba0ad44fb4a7fb78c5076c313456de199a3c29 (git)
Affected: 5d424d5a674f782d0659a3b66d951f412901faee , < 41e191fe72282e193a7744e2fc1786b23156c9e4 (git)
Affected: 5d424d5a674f782d0659a3b66d951f412901faee , < 40570375356c874b1578e05c1dcc3ff7c1322dbe (git)
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Linux Linux Affected: 2.6.17
Unaffected: 0 , < 2.6.17 (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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Show details on NVD website
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{
  "containers": {
    "cna": {
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        {
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          "product": "Linux",
          "programFiles": [
            "include/net/tcp.h",
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            "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",
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            "net/ipv4/tcp_yeah.c",
            "net/ipv6/tcp_ipv6.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: add accessors to read/set tp-\u003esnd_cwnd\n\nWe had various bugs over the years with code\nbreaking the assumption that tp-\u003esnd_cwnd is greater\nthan zero.\n\nLately, syzbot reported the WARN_ON_ONCE(!tp-\u003eprior_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-\u003esnd_cwnd is set to an illegal value."
        }
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            "version": "3.1"
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          "scenarios": [
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              "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 \u003c= in_flight), and divide-by-zero in congestion control, causing kernel oops/panic and full host DoS."
            }
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        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:54:43.711Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49325",
    "datePublished": "2025-02-26T02:10:48.158Z",
    "dateReserved": "2025-02-26T02:08:31.538Z",
    "dateUpdated": "2026-08-05T08:54:43.711Z",
    "state": "PUBLISHED"
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En lugar de quejarnos demasiado tarde, queremos detectar d\u00f3nde y cu\u00e1ndo tp-\u0026gt;snd_cwnd se establece en un valor 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:44:40+00:00",
      "cve": "CVE-2022-49325",
      "id": "CVE-2022-49325",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "166",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: tcp: add accessors to read/set tp-\u003esnd_cwnd",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49325.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:32:18Z",
      "cve": "CVE-2022-49325",
      "id": "CVE-2022-49325",
      "initial_release_date": "2025-02-27T03:08:43Z",
      "product_status:known_affected": "629",
      "product_status:known_not_affected": "116",
      "product_status:recommended": "162",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49325",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49325.json",
      "version": "42"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.