CVE-2026-98626
In the Linux kernel, the following vulnerability has been resolved:
bpf: Restrict CO-RE poisoning to relocatable instructions
CO-RE relocation records can name any instruction offset. When a relocation cannot be resolved, bpf_core_patch_insn() currently poisons its target before checking whether that instruction is a valid relocation target. Malformed metadata can therefore replace jumps, calls, exits, register-source arithmetic, or non-immediate loads instead of failing at the relocation step.
Handle poisoning only after the instruction has passed the same class and operand-form checks used for a resolved relocation.
Read full descriptionShow less
Route invalid forms through the existing diagnostic and return a hard error. Keep poisoning supported instructions, including both halves of a plain ldimm64, so an unresolved relocation in dead code remains valid.
Extend bpf_core_poison_insn() to poison both halves of ldimm64, and return its status directly from each validated instruction case. This avoids routing the success path through a common label and leaves the helper free to report errors.
The shared relocation code applies this restriction to both libbpf and in-kernel CO-RE.
CVSS
NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).
Exploitation probability (EPSS)
- Probability of exploitation in the next 30 days
- 0.21 %
- Percentile among all scored CVEs
- 10
- Score date
- 10/20/2026
EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).
Affected technologies (1)
⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.
References
Show 7 references
- https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456
- https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc
- https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319
- https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0
- https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449
- https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432
- https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2
Raw JSON (NVD)
Show
{
"id": "CVE-2026-98626",
"cveTags": [],
"metrics": {},
"affected": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"affectedData": [
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
"lessThan": "a8c47e62d9aea2d47a09e06c1682c59c21b92449",
"versionType": "git"
},
{
"status": "affected",
"version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
"lessThan": "d3219c229d16900cef936adad28633c98946e432",
"versionType": "git"
},
{
"status": "affected",
"version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
"lessThan": "a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0",
"versionType": "git"
},
{
"status": "affected",
"version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
"lessThan": "f2a24101e89dd0804e717da7c1bd6af513698aa2",
"versionType": "git"
},
{
"status": "affected",
"version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
"lessThan": "2d7d04357c41aa49a5ac658fcc207439f2ad6456",
"versionType": "git"
},
{
"status": "affected",
"version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
"lessThan": "8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319",
"versionType": "git"
},
{
"status": "affected",
"version": "d7a252708dbc950ca2064310217e8b9f85846e2f",
"lessThan": "394ae398337c5f87e567f6cd63b937fc2b2f6ddc",
"versionType": "git"
}
],
"programFiles": [
"tools/lib/bpf/relo_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "5.6"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "5.6",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.15.222",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.189",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.158",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.112",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.55",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.9",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"tools/lib/bpf/relo_core.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:15.640",
"references": [
{
"url": "https://git.kernel.org/stable/c/2d7d04357c41aa49a5ac658fcc207439f2ad6456",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/394ae398337c5f87e567f6cd63b937fc2b2f6ddc",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/8e4cbcca1e0a2fc5e6c8edb68e0cf5f2587f9319",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a0b79cdfcf34b53c85bac2d3cf022fc1342eeca0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/a8c47e62d9aea2d47a09e06c1682c59c21b92449",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/d3219c229d16900cef936adad28633c98946e432",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/f2a24101e89dd0804e717da7c1bd6af513698aa2",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Restrict CO-RE poisoning to relocatable instructions\n\nCO-RE relocation records can name any instruction offset. When a\nrelocation cannot be resolved, bpf_core_patch_insn() currently poisons its\ntarget before checking whether that instruction is a valid relocation\ntarget. Malformed metadata can therefore replace jumps, calls, exits,\nregister-source arithmetic, or non-immediate loads instead of failing at\nthe relocation step.\n\nHandle poisoning only after the instruction has passed the same class and\noperand-form checks used for a resolved relocation. Route invalid forms\nthrough the existing diagnostic and return a hard error. Keep poisoning\nsupported instructions, including both halves of a plain ldimm64, so an\nunresolved relocation in dead code remains valid.\n\nExtend bpf_core_poison_insn() to poison both halves of ldimm64, and return\nits status directly from each validated instruction case. This avoids\nrouting the success path through a common label and leaves the helper free\nto report errors.\n\nThe shared relocation code applies this restriction to both libbpf and\nin-kernel CO-RE."
}
],
"lastModified": "2026-10-19T10:19:26.820",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}