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CVE-2024-49571 (GCVE-0-2024-49571)

Vulnerability from cvelistv5 – Published: 2025-01-11 12:35 – Updated: 2026-08-05 11:40
VLAI
Title
net/smc: check iparea_offset and ipv6_prefixes_cnt when receiving proposal msg
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: check iparea_offset and ipv6_prefixes_cnt when receiving proposal msg When receiving proposal msg in server, the field iparea_offset and the field ipv6_prefixes_cnt in proposal msg are from the remote client and can not be fully trusted. Especially the field iparea_offset, once exceed the max value, there has the chance to access wrong address, and crash may happen. This patch checks iparea_offset and ipv6_prefixes_cnt before using them.
Severity
9.1 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e7b7a64a8493d47433fd003efbe6543e3f676294 , < 846bada23bfcdeb83621b045ed85dc06c7833ff0 (git)
Affected: e7b7a64a8493d47433fd003efbe6543e3f676294 , < f10635268a0a49ee902a3b63b5dbb76f4fed498e (git)
Affected: e7b7a64a8493d47433fd003efbe6543e3f676294 , < 62056d1592e63d85e82357ee2ae6a6a294f440b0 (git)
Affected: e7b7a64a8493d47433fd003efbe6543e3f676294 , < 91a7c27c1444ed4677b83fd5308d2cf03f5f0851 (git)
Affected: e7b7a64a8493d47433fd003efbe6543e3f676294 , < 47ce46349672a7e0c361bfe39ed0b22e824ef4fb (git)
Affected: e7b7a64a8493d47433fd003efbe6543e3f676294 , < a29e220d3c8edbf0e1beb0f028878a4a85966556 (git)
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Linux Linux Affected: 4.16
Unaffected: 0 , < 4.16 (semver)
Unaffected: 5.10.233 , ≤ 5.10.* (semver)
Unaffected: 5.15.176 , ≤ 5.15.* (semver)
Unaffected: 6.1.122 , ≤ 6.1.* (semver)
Unaffected: 6.6.68 , ≤ 6.6.* (semver)
Unaffected: 6.12.7 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:N - The malformed CLC Proposal is received over a routable TCP connection by the in-kernel SMC listener (`smc_listen_work()`), with all attacker-controlled fields (`iparea_offset`, `ipv6_prefixes_cnt`, `hdr.length`, `typev1`) coming straight off the wire. Any remote host that can reach an SMC-enabled listening socket can deliver it.\nAC:L - The attacker fully controls every field involved; no race, memory grooming, or unpredictable state is needed, and the only variable \u2014 the server\u0027s IP prefix length for `smc_clc_prfx_match4_rcu()` \u2014 is brute-forceable in at most 32 connections. The OOB read in `smc_clc_msg_prop_valid()` triggers on the very first packet with no preconditions at all.\nPR:N - The CLC handshake is the first exchange after TCP accept and SMC performs no authentication whatsoever, so the vulnerable parsing runs entirely pre-authentication. The attacker needs only the ability to complete a TCP handshake with the SMC experimental option set.\nUI:N - The server-side listen worker parses the proposal automatically upon connection; no action by any local user or administrator is required. A single unsolicited connection suffices.\nS:U - The out-of-bounds reads and the NULL dereference occur within the kernel\u0027s own memory and security authority, with no crossing of a VM, IOMMU, or sandbox boundary. Impact is confined to the kernel that parsed the message.\nC:H - `iparea_offset` lets the prefix pointer land up to ~64 KB past a ~656-byte kmalloc-1k object, and the OOB-read `ipv6_prefixes_cnt` is checked for equality against the attacker\u0027s own `hdr-\u003elength`, making success remotely observable \u2014 a byte-granular read oracle over a large window of adjacent kernel heap (kernel pointers, other sockets\u0027 data). `smc_clc_prfx_match()` reads ~144 further OOB bytes and reflects the result back as a decline reason, so this is far more than a strictly bounded few-byte read.\nI:N - The out-of-bounds pointer is only ever dereferenced for reads (`smc_clc_msg_prop_valid()`, `smc_clc_prfx_match4_rcu()`/`match6_rcu()`), and the additional defect is a NULL-pointer read; no attacker-controlled data is written out of bounds and no control-flow hijack primitive arises.\nA:H - With `typev1=SMC_TYPE_D` and `iparea_offset != 40`, `smc_find_ism_v1_device_serv()` dereferences a NULL `pclc_smcd`, oopsing the `smc_hs_wq` worker while `smc_server_lgr_pending` and the socket lock are held and never released, permanently deadlocking all further SMC server handshakes; the far OOB read can also fault on unmapped memory, and `panic_on_oops` turns either into a full system panic."
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Especially the\\nfield iparea_offset, once exceed the max value, there has the\\nchance to access wrong address, and crash may happen.\\n\\nThis patch checks iparea_offset and ipv6_prefixes_cnt before using them.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: comprobar iparea_offset e ipv6_prefixes_cnt al recibir un mensaje de propuesta Al recibir un mensaje de propuesta en el servidor, el campo iparea_offset y el campo ipv6_prefixes_cnt en el mensaje de propuesta son del cliente remoto y no se puede confiar plenamente en ellos. Especialmente el campo iparea_offset, una vez que se excede el valor m\u00e1ximo, existe la posibilidad de acceder a una direcci\u00f3n incorrecta y puede producirse un bloqueo. Este parche comprueba iparea_offset e ipv6_prefixes_cnt antes de usarlos.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/smc/af_smc.c\",\"net/smc/smc_clc.c\",\"net/smc/smc_clc.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"e7b7a64a8493d47433fd003efbe6543e3f676294\",\"lessThan\":\"846bada23bfcdeb83621b045ed85dc06c7833ff0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e7b7a64a8493d47433fd003efbe6543e3f676294\",\"lessThan\":\"f10635268a0a49ee902a3b63b5dbb76f4fed498e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e7b7a64a8493d47433fd003efbe6543e3f676294\",\"lessThan\":\"62056d1592e63d85e82357ee2ae6a6a294f440b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e7b7a64a8493d47433fd003efbe6543e3f676294\",\"lessThan\":\"91a7c27c1444ed4677b83fd5308d2cf03f5f0851\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e7b7a64a8493d47433fd003efbe6543e3f676294\",\"lessThan\":\"47ce46349672a7e0c361bfe39ed0b22e824ef4fb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e7b7a64a8493d47433fd003efbe6543e3f676294\",\"lessThan\":\"a29e220d3c8edbf0e1beb0f028878a4a85966556\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/smc/af_smc.c\",\"net/smc/smc_clc.c\",\"net/smc/smc_clc.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.16\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.16\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.233\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.176\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.122\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.68\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.7\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.13\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":9.1,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.2},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.16\",\"versionEndExcluding\":\"5.10.233\",\"matchCriteriaId\":\"0075B861-9B2C-4930-A729-C6F42C58E2AA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.176\",\"matchCriteriaId\":\"DDBD8FC6-2357-4347-BFA1-B4A4A3039F35\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.122\",\"matchCriteriaId\":\"3B06AD1C-E7B3-4B24-A884-D3BE92CC042F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.68\",\"matchCriteriaId\":\"74BA9823-CCED-4B24-815D-B82543954BF8\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.7\",\"matchCriteriaId\":\"811AC89A-14AC-49FA-9B54-E99526F1CA47\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"62567B3C-6CEE-46D0-BC2E-B3717FBF7D13\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"5A073481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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T17:48:32+00:00",
      "cve": "CVE-2024-49571",
      "id": "CVE-2024-49571",
      "initial_release_date": "2024-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/smc: check iparea_offset and ipv6_prefixes_cnt when receiving proposal msg",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-49571.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T00:30:27Z",
      "cve": "CVE-2024-49571",
      "id": "CVE-2024-49571",
      "initial_release_date": "2025-01-12T00:17:50Z",
      "product_status:known_affected": "686",
      "product_status:known_not_affected": "68",
      "product_status:recommended": "410",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-49571",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-49571.json",
      "version": "58"
    }
  }
}



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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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.