CVE-2026-98600
Status: ReceivedUnscored—
Severity—Unscored
Exploitation probability0.18 %higher than 7% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()
While rfcomm_recv_frame() verifies that skb->len is at least sizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame with an extended 2-byte length field (!__test_ea(hdr->len)) has a 4-byte header plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2).
When a 4-byte RFCOMM frame with EA == 0 arrives: 1. The initial skb->len < sizeof(*hdr) + 1 check passes (4 < 4 is false). 2. Trimming the FCS byte decrements skb->len to 3. 3.
Read full descriptionShow less
If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 > 3) and returns NULL without advancing skb->data. 4. Because the return value of skb_pull() is ignored, the un-pulled 3-byte struct rfcomm_hdr remains at skb->data and is either queued as application payload via rfcomm_recv_data() or parsed as a multiplexer control command via rfcomm_recv_mcc() on DLCI 0.
Fix this by extending the length check in rfcomm_recv_frame() to also require skb->len >= sizeof(*hdr) + 2 when !__test_ea(hdr->len).
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
- 0.18 %
- Percentile among all scored CVEs
- 7
- 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 8 references
- https://git.kernel.org/stable/c/6d91041bb38b97e2feb625123cc0529d7b83a0e1
- https://git.kernel.org/stable/c/71ccacde407b7d8f0ef48974a0d2524602fd5c44
- https://git.kernel.org/stable/c/76876fd26569302d26d91cbe8b75fa8e66cf8969
- https://git.kernel.org/stable/c/7a1781a2f3a9667b3065d402d1f11986a2363e08
- https://git.kernel.org/stable/c/9240fc1f2cde5331c61608da21b00394602ca762
- https://git.kernel.org/stable/c/97711b964877242933484989224a3c4c5d88a5ee
- https://git.kernel.org/stable/c/be00deee60044ffa820f9436415caeb665b2cda0
- https://git.kernel.org/stable/c/c25587fa26761e623198b4f47151fe79d09ccde6
Raw JSON (NVD)
Show
{
"id": "CVE-2026-98600",
"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": "fb40eda15122f6b780228639c1ead6820340ff54",
"lessThan": "76876fd26569302d26d91cbe8b75fa8e66cf8969",
"versionType": "git"
},
{
"status": "affected",
"version": "3829af5fab5a22405bf1e7d69068c2ec0fce46ca",
"lessThan": "97711b964877242933484989224a3c4c5d88a5ee",
"versionType": "git"
},
{
"status": "affected",
"version": "b161eacd7fa4a2d765724b5504ac6cc388e48f80",
"lessThan": "7a1781a2f3a9667b3065d402d1f11986a2363e08",
"versionType": "git"
},
{
"status": "affected",
"version": "30d1d9f3495463f7c026e4c553127f79b486fcd6",
"lessThan": "c25587fa26761e623198b4f47151fe79d09ccde6",
"versionType": "git"
},
{
"status": "affected",
"version": "67dc3b40fae71b6b11c71e7ff69bac0758818c05",
"lessThan": "71ccacde407b7d8f0ef48974a0d2524602fd5c44",
"versionType": "git"
},
{
"status": "affected",
"version": "bbc310caa2b6bf5fe42896ba27da0fbc12e4ac51",
"lessThan": "be00deee60044ffa820f9436415caeb665b2cda0",
"versionType": "git"
},
{
"status": "affected",
"version": "b230e5bf501c5edaf2eb0991cb862ac142031d4b",
"lessThan": "9240fc1f2cde5331c61608da21b00394602ca762",
"versionType": "git"
},
{
"status": "affected",
"version": "b230e5bf501c5edaf2eb0991cb862ac142031d4b",
"lessThan": "6d91041bb38b97e2feb625123cc0529d7b83a0e1",
"versionType": "git"
},
{
"status": "affected",
"version": "6.12.111",
"lessThan": "6.12.112",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.18.53",
"lessThan": "6.18.55",
"versionType": "semver"
}
],
"programFiles": [
"net/bluetooth/rfcomm/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": "7.2"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "7.2",
"versionType": "semver"
},
{
"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": [
"net/bluetooth/rfcomm/core.c"
],
"defaultStatus": "affected"
}
]
}
],
"published": "2026-10-18T16:17:12.707",
"references": [
{
"url": "https://git.kernel.org/stable/c/6d91041bb38b97e2feb625123cc0529d7b83a0e1",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/71ccacde407b7d8f0ef48974a0d2524602fd5c44",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/76876fd26569302d26d91cbe8b75fa8e66cf8969",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/7a1781a2f3a9667b3065d402d1f11986a2363e08",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/9240fc1f2cde5331c61608da21b00394602ca762",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/97711b964877242933484989224a3c4c5d88a5ee",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/be00deee60044ffa820f9436415caeb665b2cda0",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"url": "https://git.kernel.org/stable/c/c25587fa26761e623198b4f47151fe79d09ccde6",
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"vulnStatus": "Received",
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: Reject short EA=0 frames in rfcomm_recv_frame()\n\nWhile rfcomm_recv_frame() verifies that skb->len is at least\nsizeof(*hdr) + 1 (4 bytes: 3-byte header + 1-byte FCS), an RFCOMM frame\nwith an extended 2-byte length field (!__test_ea(hdr->len)) has a 4-byte\nheader plus a 1-byte FCS (5 bytes minimum, sizeof(*hdr) + 2).\n\nWhen a 4-byte RFCOMM frame with EA == 0 arrives:\n1. The initial skb->len < sizeof(*hdr) + 1 check passes (4 < 4 is false).\n2. Trimming the FCS byte decrements skb->len to 3.\n3. If __check_fcs() succeeds, skb_pull(skb, 4) fails (4 > 3) and returns\n NULL without advancing skb->data.\n4. Because the return value of skb_pull() is ignored, the un-pulled\n 3-byte struct rfcomm_hdr remains at skb->data and is either queued as\n application payload via rfcomm_recv_data() or parsed as a multiplexer\n control command via rfcomm_recv_mcc() on DLCI 0.\n\nFix this by extending the length check in rfcomm_recv_frame() to also\nrequire skb->len >= sizeof(*hdr) + 2 when !__test_ea(hdr->len)."
}
],
"lastModified": "2026-10-19T10:19:21.517",
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}