FKIE_CVE-2026-74610
Vulnerability from fkie_nvd - Published: 2026-08-22 16:16 - Updated: 2026-08-25 06:18
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
tls: don't leave a full plaintext sk_msg ring unpushed
When the copy path in tls_sw_sendmsg_locked() adds the fragment that fills
the plaintext sk_msg ring, it does not set full_record, so the record is
left full and unpushed. A later splice() then adds to an already full
ring: sk_msg_page_add() has no fullness check of its own, so sg.end wraps
onto sg.start and the ring appears empty. Fragments added after that
overwrite live entries, and sg.size no longer matches what is reachable
between sg.start and sg.end, so pushing the record runs the scatterwalk off
the end of the scatterlist.
An unprivileged user can trigger this on a loopback TCP socket with the
"tls" ULP attached:
BUG: kernel NULL pointer dereference, address: 0000000000000008
RIP: 0010:memcpy_from_scatterwalk+0x32/0xc0
Call Trace:
skcipher_walk_next+0x1d1/0x2c0
gcm_encrypt_aesni_avx+0x1e9/0x220
bpf_exec_tx_verdict+0x3bb/0x860
tls_sw_sendmsg+0xa1a/0xca0
__sys_sendto+0x1da/0x1f0
Set full_record in the copy path when the ring becomes full, and push a
record that is already full on entry to the sendmsg loop.
References
Impacted products
| Vendor | Product | Version |
|---|
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/tls/tls_sw.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "aa8b14647721b5a4958712b35cf43e3125d47753",
"status": "affected",
"version": "fe1e81d4f73b6cbaed4fcc476960d26770642842",
"versionType": "git"
},
{
"lessThan": "f634289a0b557a197c5f37284b623cefedfe73d5",
"status": "affected",
"version": "fe1e81d4f73b6cbaed4fcc476960d26770642842",
"versionType": "git"
},
{
"lessThan": "3fc5044796dd87b8d68be4207046f5ce2748174c",
"status": "affected",
"version": "fe1e81d4f73b6cbaed4fcc476960d26770642842",
"versionType": "git"
},
{
"lessThan": "3c5f8f2aa57c647b83add4896aab64aac5fdedad",
"status": "affected",
"version": "fe1e81d4f73b6cbaed4fcc476960d26770642842",
"versionType": "git"
},
{
"lessThan": "7bca91d63341274e857f4aeaad54d229405e93dc",
"status": "affected",
"version": "fe1e81d4f73b6cbaed4fcc476960d26770642842",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/tls/tls_sw.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.5"
},
{
"lessThan": "6.5",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.152",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.104",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.45",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.9",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: don\u0027t leave a full plaintext sk_msg ring unpushed\n\nWhen the copy path in tls_sw_sendmsg_locked() adds the fragment that fills\nthe plaintext sk_msg ring, it does not set full_record, so the record is\nleft full and unpushed. A later splice() then adds to an already full\nring: sk_msg_page_add() has no fullness check of its own, so sg.end wraps\nonto sg.start and the ring appears empty. Fragments added after that\noverwrite live entries, and sg.size no longer matches what is reachable\nbetween sg.start and sg.end, so pushing the record runs the scatterwalk off\nthe end of the scatterlist.\n\nAn unprivileged user can trigger this on a loopback TCP socket with the\n\"tls\" ULP attached:\n\n BUG: kernel NULL pointer dereference, address: 0000000000000008\n RIP: 0010:memcpy_from_scatterwalk+0x32/0xc0\n Call Trace:\n skcipher_walk_next+0x1d1/0x2c0\n gcm_encrypt_aesni_avx+0x1e9/0x220\n bpf_exec_tx_verdict+0x3bb/0x860\n tls_sw_sendmsg+0xa1a/0xca0\n __sys_sendto+0x1da/0x1f0\n\nSet full_record in the copy path when the ring becomes full, and push a\nrecord that is already full on entry to the sendmsg loop."
}
],
"id": "CVE-2026-74610",
"lastModified": "2026-08-25T06:18:38.140",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
}
]
},
"published": "2026-08-22T16:16:33.547",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3c5f8f2aa57c647b83add4896aab64aac5fdedad"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/3fc5044796dd87b8d68be4207046f5ce2748174c"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/7bca91d63341274e857f4aeaad54d229405e93dc"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/aa8b14647721b5a4958712b35cf43e3125d47753"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/f634289a0b557a197c5f37284b623cefedfe73d5"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
Loading…
Loading…
Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
Loading…
The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Loading…
Loading…