CVE-2026-68162 (GCVE-0-2026-68162)
Vulnerability from cvelistv5
Published
2026-08-10 11:59
Modified
2026-08-23 12:46
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
sctp: avoid auth_enable sysctl UAF during netns teardown
proc_sctp_do_auth() updates the SCTP control socket after changing
net.sctp.auth_enable. The handler gets the per-net SCTP state from
ctl->data, so an already opened sysctl file can still target a network
namespace while that namespace is being torn down.
SCTP previously registered its per-net sysctls from sctp_defaults_init(),
while the control socket is created later from sctp_ctrlsock_init(). This
exposed a window during initialization where auth_enable was writable
before net->sctp.ctl_sock existed, and a teardown window where auth_enable
stayed writable after inet_ctl_sock_destroy() had released the control
socket.
Move the per-net SCTP sysctl registration into sctp_ctrlsock_init() after
sctp_ctl_sock_init() succeeds, and unregister the sysctl table before
destroying the control socket in sctp_ctrlsock_exit(). If sysctl
registration fails after the control socket was created, destroy the
control socket in the same init path.
Make sctp_sysctl_net_unregister() tolerate a missing header and clear the
saved pointer so init-error and exit paths can safely share the unregister
helper.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 10c869a52f266e40f548cc3c565d14930a5edafc Version: dc583e7e5f8515ca489c0df28e4362a70eade382 Version: bd2a2939423566c654545fa3e96a656662a0af9e Version: 1b67030d39f2b00f94ac1f0af11ba6657589e4d3 Version: 7ec30c54f339c640aa7e49d7e9f7bbed6bd42bf6 Version: c184bc621e3cef03ac9ba81a50dda2dae6a21d36 Version: 15649fd5415eda664ef35780c2013adeb5d9c695 Version: 15649fd5415eda664ef35780c2013adeb5d9c695 Version: 15649fd5415eda664ef35780c2013adeb5d9c695 Version: 5.4.290 ≤ Version: 5.10.234 ≤ Version: 5.15.177 ≤ Version: 6.1.125 ≤ Version: 6.6.72 ≤ Version: 6.12.10 ≤ |
||
{
"containers": {
"cna": {
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{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/sctp/protocol.c",
"net/sctp/sysctl.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"versions": [
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},
{
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{
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{
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{
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"versionType": "git"
},
{
"lessThan": "5.4.292",
"status": "affected",
"version": "5.4.290",
"versionType": "semver"
},
{
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"status": "affected",
"version": "5.10.234",
"versionType": "semver"
},
{
"lessThan": "5.15.217",
"status": "affected",
"version": "5.15.177",
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},
{
"lessThan": "6.1.184",
"status": "affected",
"version": "6.1.125",
"versionType": "semver"
},
{
"lessThan": "6.6.151",
"status": "affected",
"version": "6.6.72",
"versionType": "semver"
},
{
"lessThan": "6.12.101",
"status": "affected",
"version": "6.12.10",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/sctp/protocol.c",
"net/sctp/sysctl.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"lessThan": "6.13",
"status": "unaffected",
"version": "0",
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},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
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},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.266",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.217",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
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"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.151",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.101",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.42",
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},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.6",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.292",
"versionStartIncluding": "5.4.290",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.266",
"versionStartIncluding": "5.10.234",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.15.177",
"vulnerable": true
},
{
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.151",
"versionStartIncluding": "6.6.72",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.101",
"versionStartIncluding": "6.12.10",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.42",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.6",
"versionStartIncluding": "6.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "6.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsctp: avoid auth_enable sysctl UAF during netns teardown\n\nproc_sctp_do_auth() updates the SCTP control socket after changing\nnet.sctp.auth_enable. The handler gets the per-net SCTP state from\nctl-\u003edata, so an already opened sysctl file can still target a network\nnamespace while that namespace is being torn down.\n\nSCTP previously registered its per-net sysctls from sctp_defaults_init(),\nwhile the control socket is created later from sctp_ctrlsock_init(). This\nexposed a window during initialization where auth_enable was writable\nbefore net-\u003esctp.ctl_sock existed, and a teardown window where auth_enable\nstayed writable after inet_ctl_sock_destroy() had released the control\nsocket.\n\nMove the per-net SCTP sysctl registration into sctp_ctrlsock_init() after\nsctp_ctl_sock_init() succeeds, and unregister the sysctl table before\ndestroying the control socket in sctp_ctrlsock_exit(). If sysctl\nregistration fails after the control socket was created, destroy the\ncontrol socket in the same init path.\n\nMake sctp_sysctl_net_unregister() tolerate a missing header and clear the\nsaved pointer so init-error and exit paths can safely share the unregister\nhelper."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - The bug is triggered only by writing the per-net sysctl net.sctp.auth_enable via /proc/sys (proc_sctp_do_auth); it is not reachable from SCTP packet receive, sockets, or other remote protocol paths.\nAC:L - An attacker can open the sysctl file, concurrently destroy the target network namespace, and repeatedly write during teardown; pernet exit destroys ctl_sock before unregistering sysctls, and the attacker controls both sides of that race.\nPR:L - Exploitation requires writing a mode 0644 sysctl in a network namespace; an unprivileged host user with CAP_NET_ADMIN via user namespaces can create a netns, become namespace root, and write net/sctp/auth_enable without init-namespace privileges.\nUI:N - No victim interaction is required beyond the attacker opening the sysctl and triggering namespace teardown in their own threads or processes.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same host/kernel security domain; it does not cross VM, container, or IOMMU boundaries by itself.\nC:H - proc_sctp_do_auth dereferences net-\u003esctp.ctl_sock after inet_ctl_sock_destroy; lock_sock and sctp_sk(sk)-\u003eep access freed socket/endpoint memory, a use-after-free that can disclose or infer heap contents.\nI:H - On a successful write, the handler sets sctp_sk(sk)-\u003eep-\u003eauth_enable on a freed endpoint object, giving a controlled heap write primitive that can be developed into arbitrary kernel modification or code execution.\nA:H - Use-after-free on the SCTP control socket/endpoint during sysctl processing can cause kernel oops/panic from lock_sock or ep access on freed memory, even when full exploitation is not attempted."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-23T12:46:01.222Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/19573dcddb8819fd68d6cd1f916c1c99c3fa4ff4"
},
{
"url": "https://git.kernel.org/stable/c/ceb7190b5c873d4a1267a1600c5aa52c600e929f"
},
{
"url": "https://git.kernel.org/stable/c/fd66854a22661929245f3d2b244c432bc8b1a150"
},
{
"url": "https://git.kernel.org/stable/c/158f3cc332dc53f43ec20060233d7c3cecd6d912"
},
{
"url": "https://git.kernel.org/stable/c/66700c0719675e0e118ae83b2d7168dacd69dd3d"
},
{
"url": "https://git.kernel.org/stable/c/626bda8cfe43dff19a9833ff6ba055a817b5455c"
},
{
"url": "https://git.kernel.org/stable/c/be6aae9d1b91c603adb35872d37d40e83daf8758"
},
{
"url": "https://git.kernel.org/stable/c/a50e73488e0bbdd262b3be3c9a1d8dd078382381"
},
{
"url": "https://git.kernel.org/stable/c/f8d5e7846025f4ab15a461235f8ebae9094a361a"
}
],
"title": "sctp: avoid auth_enable sysctl UAF during netns teardown",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-68162",
"datePublished": "2026-08-10T11:59:29.099Z",
"dateReserved": "2026-07-30T09:28:09.372Z",
"dateUpdated": "2026-08-23T12:46:01.222Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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