FKIE_CVE-2026-53078
Vulnerability from fkie_nvd - Published: 2026-06-24 17:17 - Updated: 2026-07-21 18:14
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix same-register dst/src OOB read and pointer leak in sock_ops
When a BPF sock_ops program accesses ctx fields with dst_reg == src_reg,
the SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the
destination register in the !fullsock / !locked_tcp_sock path.
Both macros borrow a temporary register to check is_fullsock /
is_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the
ctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with
a request_sock), dst_reg should be zeroed but is not, leaving the stale
ctx pointer:
- SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks
as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer,
leading to stack-out-of-bounds access in helpers like
bpf_skc_to_tcp6_sock().
- SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the
verifier believes is a SCALAR_VALUE, leaking a kernel pointer.
Fix both macros by:
- Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the
added instruction.
- Adding BPF_MOV64_IMM(si->dst_reg, 0) after the temp register
restore in the !fullsock path, placed after the restore because
dst_reg == src_reg means we need src_reg intact to read ctx->temp.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.9 | |
| linux | linux_kernel | 5.9 | |
| linux | linux_kernel | 5.9 | |
| linux | linux_kernel | 5.9 | |
| linux | linux_kernel | 5.9 | |
| linux | linux_kernel | 5.9 | |
| linux | linux_kernel | 5.9 | |
| linux | linux_kernel | 5.9 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "18e3ffde1822f0b48b1753bf34aa97ce839df1d8",
"status": "affected",
"version": "fd09af010788a884de1c39537c288830c3d305db",
"versionType": "git"
},
{
"lessThan": "10f86a2a5c91fc4c4d001960f1c21abe52545ef6",
"status": "affected",
"version": "fd09af010788a884de1c39537c288830c3d305db",
"versionType": "git"
},
{
"status": "affected",
"version": "48be3df15aa19c04eadf156c9129293c9a10389f",
"versionType": "git"
},
{
"status": "affected",
"version": "cd4644d904e1d153d516e73e2e127e7a2fe687e1",
"versionType": "git"
},
{
"status": "affected",
"version": "6e0bc946cbeec538322820786b5fb5200a2216ab",
"versionType": "git"
},
{
"status": "affected",
"version": "a7e52f7f675046d9ffc5692d815fa67c82fcdbf5",
"versionType": "git"
},
{
"status": "affected",
"version": "db7f8c57dbdd31f7e59f8dc8d1e1b38607a320ef",
"versionType": "git"
},
{
"lessThan": "5.8",
"status": "affected",
"version": "5.7.18",
"versionType": "semver"
},
{
"lessThan": "5.9",
"status": "affected",
"version": "5.8.4",
"versionType": "semver"
},
{
"lessThan": "5.5",
"status": "affected",
"version": "5.4.61",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/core/filter.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"lessThan": "5.9",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.10",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "435DC924-B527-4D24-9771-05EBDC20047B",
"versionEndExcluding": "5.5",
"versionStartIncluding": "5.4.61",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "8141C666-AECC-41B8-BD7E-DED92216B4A5",
"versionEndExcluding": "5.8",
"versionStartIncluding": "5.7.18",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "560FB3D4-80AB-415C-96DA-0097E0BCB36F",
"versionEndExcluding": "5.9",
"versionStartIncluding": "5.8.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "9211326E-7B68-49D5-BDEC-B2289D9A2F81",
"versionEndExcluding": "7.0.10",
"versionStartIncluding": "5.9.1",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:-:*:*:*:*:*:*",
"matchCriteriaId": "F79A2EB6-623E-4749-AEE0-DCB58C4C42F8",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc2:*:*:*:*:*:*",
"matchCriteriaId": "A67F6509-9592-44D5-8C65-B0791C7A501A",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc3:*:*:*:*:*:*",
"matchCriteriaId": "A52A4ABE-5C24-4CD4-A348-E303B7F23C71",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc4:*:*:*:*:*:*",
"matchCriteriaId": "12019CF2-FD8E-4D59-BA4C-7093DF0BB091",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc5:*:*:*:*:*:*",
"matchCriteriaId": "9B1AB90E-C0C6-4027-B27D-BA214BE33561",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc6:*:*:*:*:*:*",
"matchCriteriaId": "103FE5BA-7315-4263-9C95-EABEAD7E174F",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc7:*:*:*:*:*:*",
"matchCriteriaId": "47E31D6A-31EC-4F63-9CAE-B7A52B58E149",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:5.9:rc8:*:*:*:*:*:*",
"matchCriteriaId": "3497462B-A3DA-47CC-A5DD-C1C2D2E6DFDE",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Fix same-register dst/src OOB read and pointer leak in sock_ops\n\nWhen a BPF sock_ops program accesses ctx fields with dst_reg == src_reg,\nthe SOCK_OPS_GET_SK() and SOCK_OPS_GET_FIELD() macros fail to zero the\ndestination register in the !fullsock / !locked_tcp_sock path.\n\nBoth macros borrow a temporary register to check is_fullsock /\nis_locked_tcp_sock when dst_reg == src_reg, because dst_reg holds the\nctx pointer. When the check is false (e.g., TCP_NEW_SYN_RECV state with\na request_sock), dst_reg should be zeroed but is not, leaving the stale\nctx pointer:\n\n - SOCK_OPS_GET_SK: dst_reg retains the ctx pointer, passes NULL checks\n as PTR_TO_SOCKET_OR_NULL, and can be used as a bogus socket pointer,\n leading to stack-out-of-bounds access in helpers like\n bpf_skc_to_tcp6_sock().\n\n - SOCK_OPS_GET_FIELD: dst_reg retains the ctx pointer which the\n verifier believes is a SCALAR_VALUE, leaking a kernel pointer.\n\nFix both macros by:\n - Changing JMP_A(1) to JMP_A(2) in the fullsock path to skip the\n added instruction.\n - Adding BPF_MOV64_IMM(si-\u003edst_reg, 0) after the temp register\n restore in the !fullsock path, placed after the restore because\n dst_reg == src_reg means we need src_reg intact to read ctx-\u003etemp."
}
],
"id": "CVE-2026-53078",
"lastModified": "2026-07-21T18:14:26.080",
"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": "2026-06-24T17:17:21.850",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/10f86a2a5c91fc4c4d001960f1c21abe52545ef6"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/18e3ffde1822f0b48b1753bf34aa97ce839df1d8"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-125"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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.
Loading…
Loading…