242 lines
12 KiB
JSON
242 lines
12 KiB
JSON
{
|
|
"dataType": "CVE_RECORD",
|
|
"dataVersion": "5.2",
|
|
"cveMetadata": {
|
|
"cveId": "CVE-2025-21789",
|
|
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"state": "PUBLISHED",
|
|
"assignerShortName": "Linux",
|
|
"dateReserved": "2024-12-29T08:45:45.766Z",
|
|
"datePublished": "2025-02-27T02:18:27.817Z",
|
|
"dateUpdated": "2026-08-05T11:54:27.092Z"
|
|
},
|
|
"containers": {
|
|
"cna": {
|
|
"providerMetadata": {
|
|
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
|
|
"shortName": "Linux",
|
|
"dateUpdated": "2026-08-05T11:54:27.092Z"
|
|
},
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nLoongArch: csum: Fix OoB access in IP checksum code for negative lengths\n\nCommit 69e3a6aa6be2 (\"LoongArch: Add checksum optimization for 64-bit\nsystem\") would cause an undefined shift and an out-of-bounds read.\n\nCommit 8bd795fedb84 (\"arm64: csum: Fix OoB access in IP checksum code\nfor negative lengths\") fixes the same issue on ARM64."
|
|
}
|
|
],
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"version": "3.1",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H",
|
|
"baseScore": 7.3,
|
|
"baseSeverity": "HIGH"
|
|
},
|
|
"scenarios": [
|
|
{
|
|
"lang": "en",
|
|
"value": "AV:L - The negative length originates from skb metadata (csum_start vs. transport header offset) that the attacker sets locally via an AF_PACKET/tun socket with virtio_net_hdr, not from remote packet header fields — every RX path that derives lengths from peer-supplied headers validates them first (e.g. `tcf_csum_skb_nextlayer()`'s `ipl < hl` check). Exploitation therefore requires local socket API access.\nAC:L - The attacker deterministically chooses csum_start, csum_offset and gso_size in the virtio_net_hdr and immediately drives the packet through the GSO segmentation path; there is no race, no memory-layout dependency, and no state outside the attacker's control.\nPR:L - An unprivileged local user can obtain CAP_NET_RAW in a new user+network namespace (`unshare -Urn`) and open the AF_PACKET socket needed to inject the crafted virtio_net_hdr; no real root and no init-namespace capability is required.\nUI:N - The entire sequence is a single sendmsg() by the attacker's own process; no victim action, mount, or file open is involved.\nS:U - The out-of-bounds read stays within the kernel's own address space and security authority — there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - This is a slab-out-of-bounds read (KASAN reports it as an unbounded ~4 GB read) whose out-of-bounds bytes are folded into the checksum that is then written into the outgoing packet header and transmitted, giving the attacker an observable channel onto adjacent kernel heap contents.\nI:L - The undefined shift makes the tail-masking meaningless, so a corrupted checksum is computed from out-of-bounds data and stored into the transmitted packet's checksum field; this modifies network data but yields no kernel memory write primitive.\nA:H - On KASAN/UBSAN-instrumented kernels the negative length produces a slab-out-of-bounds report and an undefined-shift splat that panics under the widely deployed panic_on_warn setting, and the huge shadow-memory scan from `kasan_check_read()` with a ~4 GB size makes an oops the expected outcome."
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"affected": [
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "unaffected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"arch/loongarch/lib/csum.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "69e3a6aa6be21de6aaf38130fad97ecde34a193c",
|
|
"lessThan": "964a8895704a22efc06a2a3276b624a5ae985a06",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "69e3a6aa6be21de6aaf38130fad97ecde34a193c",
|
|
"lessThan": "9f15a8df542c0f08732a67d1a14ee7c22948fb97",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "69e3a6aa6be21de6aaf38130fad97ecde34a193c",
|
|
"lessThan": "d6508ffff32b44b6d0de06704034e4eef1c307a7",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
},
|
|
{
|
|
"version": "69e3a6aa6be21de6aaf38130fad97ecde34a193c",
|
|
"lessThan": "6287f1a8c16138c2ec750953e35039634018c84a",
|
|
"status": "affected",
|
|
"versionType": "git"
|
|
}
|
|
]
|
|
},
|
|
{
|
|
"product": "Linux",
|
|
"vendor": "Linux",
|
|
"defaultStatus": "affected",
|
|
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
|
|
"programFiles": [
|
|
"arch/loongarch/lib/csum.c"
|
|
],
|
|
"versions": [
|
|
{
|
|
"version": "6.4",
|
|
"status": "affected"
|
|
},
|
|
{
|
|
"version": "0",
|
|
"lessThan": "6.4",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.6.79",
|
|
"lessThanOrEqual": "6.6.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.12.16",
|
|
"lessThanOrEqual": "6.12.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.13.4",
|
|
"lessThanOrEqual": "6.13.*",
|
|
"status": "unaffected",
|
|
"versionType": "semver"
|
|
},
|
|
{
|
|
"version": "6.14",
|
|
"lessThanOrEqual": "*",
|
|
"status": "unaffected",
|
|
"versionType": "original_commit_for_fix"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"cpeApplicability": [
|
|
{
|
|
"nodes": [
|
|
{
|
|
"operator": "OR",
|
|
"negate": false,
|
|
"cpeMatch": [
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.4",
|
|
"versionEndExcluding": "6.6.79"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.4",
|
|
"versionEndExcluding": "6.12.16"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.4",
|
|
"versionEndExcluding": "6.13.4"
|
|
},
|
|
{
|
|
"vulnerable": true,
|
|
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
|
|
"versionStartIncluding": "6.4",
|
|
"versionEndExcluding": "6.14"
|
|
}
|
|
]
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"references": [
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/964a8895704a22efc06a2a3276b624a5ae985a06"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/9f15a8df542c0f08732a67d1a14ee7c22948fb97"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/d6508ffff32b44b6d0de06704034e4eef1c307a7"
|
|
},
|
|
{
|
|
"url": "https://git.kernel.org/stable/c/6287f1a8c16138c2ec750953e35039634018c84a"
|
|
}
|
|
],
|
|
"title": "LoongArch: csum: Fix OoB access in IP checksum code for negative lengths",
|
|
"x_generator": {
|
|
"engine": "bippy-1.2.0"
|
|
}
|
|
},
|
|
"adp": [
|
|
{
|
|
"metrics": [
|
|
{
|
|
"cvssV3_1": {
|
|
"scope": "UNCHANGED",
|
|
"version": "3.1",
|
|
"baseScore": 7.1,
|
|
"attackVector": "LOCAL",
|
|
"baseSeverity": "HIGH",
|
|
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
|
|
"integrityImpact": "NONE",
|
|
"userInteraction": "NONE",
|
|
"attackComplexity": "LOW",
|
|
"availabilityImpact": "HIGH",
|
|
"privilegesRequired": "LOW",
|
|
"confidentialityImpact": "HIGH"
|
|
}
|
|
},
|
|
{
|
|
"other": {
|
|
"type": "ssvc",
|
|
"content": {
|
|
"id": "CVE-2025-21789",
|
|
"role": "CISA Coordinator",
|
|
"options": [
|
|
{
|
|
"Exploitation": "none"
|
|
},
|
|
{
|
|
"Automatable": "no"
|
|
},
|
|
{
|
|
"Technical Impact": "partial"
|
|
}
|
|
],
|
|
"version": "2.0.3",
|
|
"timestamp": "2025-10-01T19:29:57.287707Z"
|
|
}
|
|
}
|
|
}
|
|
],
|
|
"problemTypes": [
|
|
{
|
|
"descriptions": [
|
|
{
|
|
"lang": "en",
|
|
"type": "CWE",
|
|
"cweId": "CWE-125",
|
|
"description": "CWE-125 Out-of-bounds Read"
|
|
}
|
|
]
|
|
}
|
|
],
|
|
"title": "CISA ADP Vulnrichment",
|
|
"providerMetadata": {
|
|
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
|
|
"shortName": "CISA-ADP",
|
|
"dateUpdated": "2025-10-01T19:36:39.729Z"
|
|
}
|
|
}
|
|
]
|
|
}
|
|
} |