CVE-2025-38608 (GCVE-0-2025-38608)

Vulnerability from cvelistv5 – Published: 2025-08-19 17:03 – Updated: 2026-08-05 12:03
VLAI
Title
bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls
Summary
In the Linux kernel, the following vulnerability has been resolved: bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls When sending plaintext data, we initially calculated the corresponding ciphertext length. However, if we later reduced the plaintext data length via socket policy, we failed to recalculate the ciphertext length. This results in transmitting buffers containing uninitialized data during ciphertext transmission. This causes uninitialized bytes to be appended after a complete "Application Data" packet, leading to errors on the receiving end when parsing TLS record.
Severity
8.6 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 6ba20ff3cdb96a908b9dc93cf247d0b087672e7c (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 849d24dc5aed45ebeb3490df429356739256ac40 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 73fc5d04009d3969ff8e8574f0fd769f04124e59 (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 16aca8bb4ad0d8a13c8b6da4007f4e52d53035bb (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 0e853c1464bcf61207f8b5c32d2ac5ee495e859d (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < ee03766d79de0f61ea29ffb6ab1c7b196ea1b02e (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 90d6ef67440cec2a0aad71a0108c8f216437345c (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 1e480387d4b42776f8957fb148af9d75ce93b96d (git)
Affected: 7246d8ed4dcce23f7509949a77be15fa9f0e3d28 , < 178f6a5c8cb3b6be1602de0964cd440243f493c9 (git)
Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.148 , ≤ 6.1.* (semver)
Unaffected: 6.6.102 , ≤ 6.6.* (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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              "value": "AV:N - The un-trimmed `msg_encrypted` tail is spliced into the TCP stream by `tls_push_sg()`, so the uninitialized kernel memory is delivered in cleartext to the remote TLS peer over the network. A remote client of a kTLS-offloaded service receives the leak simply by driving responses on the connection.\nAC:L - The mismatch is deterministic \u2014 any `bpf_msg_pop_data()` call makes `msg_encrypted` larger than the encrypted output, and every subsequent record leaks \u2014 with no race, timing window, or memory-layout condition to win. The required sockmap/SK_MSG/kTLS setup is the affected configuration, not a condition the attacker must overcome.\nPR:N - The party receiving the leaked kernel memory is the remote TLS peer, which needs no credentials on the target \u2014 an unauthenticated client that merely opens a connection and elicits a response gets the uninitialized bytes appended to the stream.\nUI:N - No victim action is needed; the corruption happens automatically inside `bpf_exec_tx_verdict()`/`tls_push_record()` on every transmit through the affected path.\nS:U - The defect and its impact stay within the kernel\u0027s own security authority \u2014 leaked memory and the corrupted socket stream are managed by the same vulnerable component, with no VM, IOMMU, or sandbox boundary crossed.\nC:H - Up to a full record (~16 KB) of never-initialized page-frag memory is transmitted per record and repeats indefinitely; those pages come unzeroed from `skb_page_frag_refill()`/the buddy allocator and can hold other sockets\u0027 or processes\u0027 data, including other kTLS sessions\u0027 plaintext, disclosed in the clear outside the AEAD.\nI:L - The application\u0027s outbound byte stream is corrupted with bytes it never sent, but the attacker does not control the injected content and the TLS AEAD prevents it from being accepted as valid application data by the receiver.\nA:L - The trailing garbage desynchronizes the peer\u0027s TLS record parser, causing record-parse errors and teardown of the affected connection, but there is no kernel oops, hang, or system-wide denial of service."
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    "dateUpdated": "2026-08-05T12:03:28.203Z",
    "state": "PUBLISHED"
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      "date": "2026-08-05",
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      "cve": "CVE-2025-38608",
      "id": "msrc_CVE-2025-38608",
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      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "bpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls",
      "url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-38608.json",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-38608\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-19T17:15:39.203\",\"lastModified\":\"2026-07-30T06:23:30.570\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbpf, ktls: Fix data corruption when using bpf_msg_pop_data() in ktls\\n\\nWhen sending plaintext data, we initially calculated the corresponding\\nciphertext length. However, if we later reduced the plaintext data length\\nvia socket policy, we failed to recalculate the ciphertext length.\\n\\nThis results in transmitting buffers containing uninitialized data during\\nciphertext transmission.\\n\\nThis causes uninitialized bytes to be appended after a complete\\n\\\"Application Data\\\" packet, leading to errors on the receiving end when\\nparsing TLS record.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bpf, ktls: Se corrige la corrupci\u00f3n de datos al usar bpf_msg_pop_data() en ktls. Al enviar datos de texto plano, inicialmente se calculaba la longitud del texto cifrado correspondiente. Sin embargo, si posteriormente se reduc\u00eda la longitud de los datos de texto plano mediante la pol\u00edtica de socket, no se pod\u00eda recalcular la longitud del texto cifrado. Esto provoca que se transmitan b\u00faferes con datos sin inicializar durante la transmisi\u00f3n del texto cifrado. Esto provoca que se a\u00f1adan bytes sin inicializar despu\u00e9s de un paquete completo de \\\"Datos de Aplicaci\u00f3n\\\", lo que genera errores en el receptor al analizar el registro TLS.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/tls/tls_sw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"6ba20ff3cdb96a908b9dc93cf247d0b087672e7c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"849d24dc5aed45ebeb3490df429356739256ac40\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"73fc5d04009d3969ff8e8574f0fd769f04124e59\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"16aca8bb4ad0d8a13c8b6da4007f4e52d53035bb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"0e853c1464bcf61207f8b5c32d2ac5ee495e859d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"ee03766d79de0f61ea29ffb6ab1c7b196ea1b02e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"90d6ef67440cec2a0aad71a0108c8f216437345c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"1e480387d4b42776f8957fb148af9d75ce93b96d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7246d8ed4dcce23f7509949a77be15fa9f0e3d28\",\"lessThan\":\"178f6a5c8cb3b6be1602de0964cd440243f493c9\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/tls/tls_sw.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.297\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.241\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.190\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.148\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.102\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.42\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.10\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.1\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"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:L/A:L\",\"baseScore\":8.6,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"LOW\"},\"exploitabilityScore\":3.9,\"impactScore\":4.7},{\"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\":\"CWE-908\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.0\",\"versionEndExcluding\":\"5.4.297\",\"matchCriteriaId\":\"01C836D1-3BFD-4D22-B8B0-B0033DFAC0F9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"D0D21C35-EB8A-488A-BBF9-403E4817E5DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"AD9E597F-3DDE-4D7E-9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Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-30T10:08:40+00:00",
      "cve": "CVE-2025-38608",
      "id": "CVE-2025-38608",
      "initial_release_date": "2025-08-19T00:00:00+00:00",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Linux kernel kTLS: Denial of Service from uninitialized data transmission",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38608.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-07-25T00:43:46Z",
      "cve": "CVE-2025-38608",
      "id": "CVE-2025-38608",
      "initial_release_date": "2025-08-19T23:22:57Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "483",
      "product_status:known_not_affected": "82",
      "product_status:recommended": "863",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38608",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38608.json",
      "version": "67"
    }
  }
}



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Tags
Taxonomy of the tags.





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.