CVE-2026-89783 (GCVE-0-2026-89783)
Vulnerability from cvelistv5 – Published: 2026-09-16 08:48 – Updated: 2026-09-16 14:38
VLAI
EPSS
VEX
Title
xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
Summary
In the Linux kernel, the following vulnerability has been resolved:
xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full
The depth check in xfrm6_input_addr() is off by one:
if (1 + sp->len == XFRM_MAX_DEPTH)
goto drop;
...
sp->xvec[sp->len++] = x;
xfrm_input() can leave sp->len == XFRM_MAX_DEPTH, and the transport-mode
receive path re-enters IPv6 input via xfrm_trans_reinject() with that
secpath preserved. If the inner packet carries a destination-options HAO
option or a type-2 routing header, xfrm6_input_addr() is called with
sp->len == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so
sp->xvec[sp->len++] writes one slot past the 6-element xvec[]. The write
stays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS
flags it and panics under panic_on_warn.
Use "sp->len >= XFRM_MAX_DEPTH", matching xfrm_input(). This also
restores one chain level the old check rejected at sp->len == 5.
UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10
index 6 is out of range for type 'xfrm_state *[6]'
Severity
9.8 (Critical)
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 91fc387f63c00ddfb5221127a17bac97549a8343
(git)
Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 68e8737fe8e72f085c608cff322b3d2de8340af1 (git) Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77 (git) Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < bdcda866c89f9a8b1acdabf02d26cde9fbe501d8 (git) Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 48996649222e95008cdb98cd58579e3fc8e5ee06 (git) Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 0f679e0523ddfff3fb554336ceb874b0e51e9cd3 (git) Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 5f35a29a5eed3d80befd32050843ac88dea3d61a (git) Affected: 9473e1f631de339c50bde1e3bd09e1045fe90fd5 , < 5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.25
Unaffected: 0 , < 2.6.25 (semver) Unaffected: 5.10.270 , ≤ 5.10.* (semver) Unaffected: 5.15.221 , ≤ 5.15.* (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
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{
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"product": "Linux",
"programFiles": [
"net/ipv6/xfrm6_input.c"
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"vendor": "Linux",
"versions": [
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"status": "affected",
"version": "2.6.25"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.270",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.221",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.188",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.110",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"version": "7.2.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.3-rc1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.270",
"versionStartIncluding": "2.6.25",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.221",
"versionStartIncluding": "2.6.25",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.188",
"versionStartIncluding": "2.6.25",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.157",
"versionStartIncluding": "2.6.25",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.110",
"versionStartIncluding": "2.6.25",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.52",
"versionStartIncluding": "2.6.25",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2.6",
"versionStartIncluding": "2.6.25",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.3-rc1",
"versionStartIncluding": "2.6.25",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full\n\nThe depth check in xfrm6_input_addr() is off by one:\n\n if (1 + sp-\u003elen == XFRM_MAX_DEPTH)\n goto drop;\n ...\n sp-\u003exvec[sp-\u003elen++] = x;\n\nxfrm_input() can leave sp-\u003elen == XFRM_MAX_DEPTH, and the transport-mode\nreceive path re-enters IPv6 input via xfrm_trans_reinject() with that\nsecpath preserved. If the inner packet carries a destination-options HAO\noption or a type-2 routing header, xfrm6_input_addr() is called with\nsp-\u003elen == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so\nsp-\u003exvec[sp-\u003elen++] writes one slot past the 6-element xvec[]. The write\nstays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS\nflags it and panics under panic_on_warn.\n\nUse \"sp-\u003elen \u003e= XFRM_MAX_DEPTH\", matching xfrm_input(). This also\nrestores one chain level the old check rejected at sp-\u003elen == 5.\n\n UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10\n index 6 is out of range for type \u0027xfrm_state *[6]\u0027"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The bug is on the IPv6 receive path: remote ESP/AH packets are processed by xfrm_input() until the secpath is full, then xfrm_trans_reinject() re-enters ip6_rcv_finish so an inner destopt HAO or type-2 routing header reaches xfrm6_input_addr() on internet-facing IPsec/MIP6 VPN and home-agent endpoints.\nAC:L - Once a max-depth transport-mode IPsec bundle and a MIP6 destopt or routing state are present, a peer sending nested IPsec then an inner HAO or type-2 RH deterministically bypasses the off-by-one check (1+6!=6) and writes xvec[6]; no race or attacker-uncontrollable layout is required.\nPR:N - No local account or capability on the victim is required. A remote IPsec/MIP6 peer triggers the overflow with packets accepted by already-installed SAs; creating those SAs is a deployment precondition rather than attacker privilege on the host.\nUI:N - Packets are processed in NAPI/softirq and the deferred xfrm_trans_reinject workqueue with no victim action such as mounting a filesystem, opening a file, or otherwise interacting with the host.\nS:U - The out-of-bounds write corrupts the skb sec_path in the host kernel that processed the packet; this is standard kernel memory corruption, not a VM escape, IOMMU bypass, or other cross-authority boundary.\nC:H - The overflow writes a kernel xfrm_state pointer past xvec[] into the adjacent xfrm_offload object and sets len to 7, so later xvec walks and teardown treat that overlapping memory as a state pointer, giving a memory-corruption disclosure primitive.\nI:H - This is an out-of-bounds write of a kernel pointer one slot past the 6-element xvec[] into ovec, which per kernel CVSS guidance is high integrity impact and can be shaped toward control-flow hijacking.\nA:H - UBSAN_BOUNDS flags the overflow and panics under panic_on_warn, and the corrupted sec_path (len=7 overlapping ovec) can oops during later xvec iteration or skb_ext teardown, fully denying availability."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-16T14:38:34.989Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343"
},
{
"url": "https://git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1"
},
{
"url": "https://git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77"
},
{
"url": "https://git.kernel.org/stable/c/bdcda866c89f9a8b1acdabf02d26cde9fbe501d8"
},
{
"url": "https://git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06"
},
{
"url": "https://git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3"
},
{
"url": "https://git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a"
},
{
"url": "https://git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc"
}
],
"title": "xfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-89783",
"datePublished": "2026-09-16T08:48:21.761Z",
"dateReserved": "2026-09-11T19:38:34.765Z",
"dateUpdated": "2026-09-16T14:38:34.989Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"epss": {
"cve": "CVE-2026-89783",
"date": "2026-09-16",
"epss": "0.0021",
"percentile": "0.11445"
},
"nvd": "{\"cve\":{\"id\":\"CVE-2026-89783\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-16T09:17:08.930\",\"lastModified\":\"2026-09-16T15:18:08.720\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nxfrm6: fix out-of-bounds write in xfrm6_input_addr() when secpath is full\\n\\nThe depth check in xfrm6_input_addr() is off by one:\\n\\n if (1 + sp-\u003elen == XFRM_MAX_DEPTH)\\n goto drop;\\n ...\\n sp-\u003exvec[sp-\u003elen++] = x;\\n\\nxfrm_input() can leave sp-\u003elen == XFRM_MAX_DEPTH, and the transport-mode\\nreceive path re-enters IPv6 input via xfrm_trans_reinject() with that\\nsecpath preserved. If the inner packet carries a destination-options HAO\\noption or a type-2 routing header, xfrm6_input_addr() is called with\\nsp-\u003elen == XFRM_MAX_DEPTH; the check (1 + 6 == 6) is false, so\\nsp-\u003exvec[sp-\u003elen++] writes one slot past the 6-element xvec[]. The write\\nstays within the sec_path allocation (invisible to KASAN); UBSAN_BOUNDS\\nflags it and panics under panic_on_warn.\\n\\nUse \\\"sp-\u003elen \u003e= XFRM_MAX_DEPTH\\\", matching xfrm_input(). This also\\nrestores one chain level the old check rejected at sp-\u003elen == 5.\\n\\n UBSAN: array-index-out-of-bounds in net/ipv6/xfrm6_input.c:309:10\\n index 6 is out of range for type \u0027xfrm_state *[6]\u0027\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/xfrm6_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"91fc387f63c00ddfb5221127a17bac97549a8343\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"68e8737fe8e72f085c608cff322b3d2de8340af1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"bdcda866c89f9a8b1acdabf02d26cde9fbe501d8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"48996649222e95008cdb98cd58579e3fc8e5ee06\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"0f679e0523ddfff3fb554336ceb874b0e51e9cd3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"5f35a29a5eed3d80befd32050843ac88dea3d61a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9473e1f631de339c50bde1e3bd09e1045fe90fd5\",\"lessThan\":\"5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/xfrm6_input.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.25\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.25\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.110\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.52\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.6\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"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:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0f679e0523ddfff3fb554336ceb874b0e51e9cd3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/48996649222e95008cdb98cd58579e3fc8e5ee06\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5d9e3bf34fec9a5d237e4b7cef4a707bc2e091bc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5f35a29a5eed3d80befd32050843ac88dea3d61a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/68e8737fe8e72f085c608cff322b3d2de8340af1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8fe2c53fb81f5ad5be43af2ad09583f7c78b4b77\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/91fc387f63c00ddfb5221127a17bac97549a8343\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdcda866c89f9a8b1acdabf02d26cde9fbe501d8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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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.
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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.
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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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.
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