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CERTFR-2026-AVI-0106
Vulnerability from certfr_avis - Published: 2026-01-30 - Updated: 2026-01-30
De multiples vulnérabilités ont été découvertes dans le noyau Linux d'Ubuntu. Certaines d'entre elles permettent à un attaquant de provoquer une élévation de privilèges, une atteinte à la confidentialité des données et un contournement de la politique de sécurité.
Solutions
Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).
Impacted products
References
| Title | Publication Time | Tags | ||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
||||||||||||||||||||
{
"$ref": "https://www.cert.ssi.gouv.fr/openapi.json",
"affected_systems": [
{
"description": "Ubuntu 16.04 ESM",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 20.04 ESM",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 24.04 LTS",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 18.04 ESM",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 14.04 ESM",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
},
{
"description": "Ubuntu 22.04 LTS",
"product": {
"name": "Ubuntu",
"vendor": {
"name": "Ubuntu",
"scada": false
}
}
}
],
"affected_systems_content": "",
"content": "## Solutions\n\nSe r\u00e9f\u00e9rer au bulletin de s\u00e9curit\u00e9 de l\u0027\u00e9diteur pour l\u0027obtention des correctifs (cf. section Documentation).",
"cves": [
{
"name": "CVE-2021-47485",
"url": "https://www.cve.org/CVERecord?id=CVE-2021-47485"
},
{
"name": "CVE-2025-22036",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-22036"
},
{
"name": "CVE-2024-50195",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-50195"
},
{
"name": "CVE-2024-56606",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-56606"
},
{
"name": "CVE-2022-48986",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-48986"
},
{
"name": "CVE-2024-27078",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-27078"
},
{
"name": "CVE-2024-56756",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-56756"
},
{
"name": "CVE-2025-21647",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-21647"
},
{
"name": "CVE-2024-49959",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-49959"
},
{
"name": "CVE-2025-21715",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-21715"
},
{
"name": "CVE-2024-46827",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-46827"
},
{
"name": "CVE-2022-49390",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-49390"
},
{
"name": "CVE-2024-57850",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-57850"
},
{
"name": "CVE-2024-53197",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-53197"
},
{
"name": "CVE-2025-21704",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-21704"
},
{
"name": "CVE-2024-53164",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-53164"
},
{
"name": "CVE-2024-53217",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-53217"
},
{
"name": "CVE-2022-49026",
"url": "https://www.cve.org/CVERecord?id=CVE-2022-49026"
},
{
"name": "CVE-2025-21692",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-21692"
},
{
"name": "CVE-2025-39993",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-39993"
},
{
"name": "CVE-2025-38352",
"url": "https://www.cve.org/CVERecord?id=CVE-2025-38352"
},
{
"name": "CVE-2024-26689",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-26689"
},
{
"name": "CVE-2024-50090",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-50090"
},
{
"name": "CVE-2024-58083",
"url": "https://www.cve.org/CVERecord?id=CVE-2024-58083"
}
],
"initial_release_date": "2026-01-30T00:00:00",
"last_revision_date": "2026-01-30T00:00:00",
"links": [],
"reference": "CERTFR-2026-AVI-0106",
"revisions": [
{
"description": "Version initiale",
"revision_date": "2026-01-30T00:00:00.000000"
}
],
"risks": [
{
"description": "Non sp\u00e9cifi\u00e9 par l\u0027\u00e9diteur"
},
{
"description": "D\u00e9ni de service"
},
{
"description": "Contournement de la politique de s\u00e9curit\u00e9"
},
{
"description": "Atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es"
},
{
"description": "\u00c9l\u00e9vation de privil\u00e8ges"
}
],
"summary": "De multiples vuln\u00e9rabilit\u00e9s ont \u00e9t\u00e9 d\u00e9couvertes dans le noyau Linux d\u0027Ubuntu. Certaines d\u0027entre elles permettent \u00e0 un attaquant de provoquer une \u00e9l\u00e9vation de privil\u00e8ges, une atteinte \u00e0 la confidentialit\u00e9 des donn\u00e9es et un contournement de la politique de s\u00e9curit\u00e9.",
"title": "Multiples vuln\u00e9rabilit\u00e9s dans le noyau Linux d\u0027Ubuntu",
"vendor_advisories": [
{
"published_at": "2026-01-29",
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-7986-1",
"url": "https://ubuntu.com/security/notices/USN-7986-1"
},
{
"published_at": "2026-01-29",
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-7987-2",
"url": "https://ubuntu.com/security/notices/USN-7987-2"
},
{
"published_at": "2026-01-29",
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-7988-1",
"url": "https://ubuntu.com/security/notices/USN-7988-1"
},
{
"published_at": "2026-01-29",
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-7987-1",
"url": "https://ubuntu.com/security/notices/USN-7987-1"
},
{
"published_at": "2026-01-29",
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu USN-7988-2",
"url": "https://ubuntu.com/security/notices/USN-7988-2"
},
{
"published_at": "2026-01-29",
"title": "Bulletin de s\u00e9curit\u00e9 Ubuntu LSN-0117-1",
"url": "https://ubuntu.com/security/notices/LSN-0117-1"
}
]
}
CVE-2025-21715 (GCVE-0-2025-21715)
Vulnerability from cvelistv5 – Published: 2025-02-27 02:07 – Updated: 2026-05-23 15:56
VLAI
EPSS
VEX
Title
net: davicom: fix UAF in dm9000_drv_remove
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: davicom: fix UAF in dm9000_drv_remove
dm is netdev private data and it cannot be
used after free_netdev() call. Using dm after free_netdev()
can cause UAF bug. Fix it by moving free_netdev() at the end of the
function.
This is similar to the issue fixed in commit
ad297cd2db89 ("net: qcom/emac: fix UAF in emac_remove").
This bug is detected by our static analysis tool.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 17:58 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
d28e783c20033b90a64d4e1307bafb56085d8184 , < db79e982c5f9e39ab710cbce55b05f2f5e6f1ca9
(git)
Affected: 4fd0654b8f2129b68203974ddee15f804ec011c2 , < a53cb72043443ac787ec0b5fa17bb3f8ff3d462b (git) Affected: cf9e60aa69ae6c40d3e3e4c94dd6c8de31674e9b , < 7d7d201eb3b766abe590ac0dda7a508b7db3e357 (git) Affected: cf9e60aa69ae6c40d3e3e4c94dd6c8de31674e9b , < c94ab07edc2843e2f3d46dbd82e5c681503aaadf (git) Affected: cf9e60aa69ae6c40d3e3e4c94dd6c8de31674e9b , < c411f9a5fdc9158e8f7c57eac961d3df3eb4d8ca (git) Affected: cf9e60aa69ae6c40d3e3e4c94dd6c8de31674e9b , < 5a54367a7c2378c65aaa4d3cfd952f26adef7aa7 (git) Affected: cf9e60aa69ae6c40d3e3e4c94dd6c8de31674e9b , < 2013c95df6752d9c88221d0f0f37b6f197969390 (git) Affected: cf9e60aa69ae6c40d3e3e4c94dd6c8de31674e9b , < 19e65c45a1507a1a2926649d2db3583ed9d55fd9 (git) Affected: d182994b2b6e23778b146a230efac8f1d77a3445 (git) Affected: 427b3fc3d5244fef9c1f910a9c699f2690642f83 (git) Affected: 9c49181c201d434186ca6b1a7b52e29f4169f6f8 (git) Affected: 9808f032c4d971cbf2b01411a0a2a8ee0040efe3 (git) Affected: a1f308089257616cdb91b4334c5eaa81ae17e387 (git) Affected: 5.4.106 , < 5.4.291 (semver) Affected: 5.10.24 , < 5.10.235 (semver) Affected: 4.4.262 , < 4.5 (semver) Affected: 4.9.262 , < 4.10 (semver) Affected: 4.14.226 , < 4.15 (semver) Affected: 4.19.181 , < 4.20 (semver) Affected: 5.11.7 , < 5.12 (semver) |
|
| Linux | Linux |
Affected:
5.12
Unaffected: 0 , < 5.12 (semver) Unaffected: 5.4.291 , ≤ 5.4.* (semver) Unaffected: 5.10.235 , ≤ 5.10.* (semver) Unaffected: 5.15.179 , ≤ 5.15.* (semver) Unaffected: 6.1.129 , ≤ 6.1.* (semver) Unaffected: 6.6.76 , ≤ 6.6.* (semver) Unaffected: 6.12.13 , ≤ 6.12.* (semver) Unaffected: 6.13.2 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix) |
{
"containers": {
"adp": [
{
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
}
},
{
"other": {
"content": {
"id": "CVE-2025-21715",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2025-02-27T17:58:14.582749Z",
"version": "2.0.3"
},
"type": "ssvc"
}
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-416",
"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2025-02-27T18:02:28.224Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
},
{
"providerMetadata": {
"dateUpdated": "2025-11-03T19:36:09.373Z",
"orgId": "af854a3a-2127-422b-91ae-364da2661108",
"shortName": "CVE"
},
"references": [
{
"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html"
},
{
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
}
],
"title": "CVE Program Container"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/ethernet/davicom/dm9000.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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},
{
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},
{
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"status": "affected",
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{
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{
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{
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"version": "cf9e60aa69ae6c40d3e3e4c94dd6c8de31674e9b",
"versionType": "git"
},
{
"status": "affected",
"version": "d182994b2b6e23778b146a230efac8f1d77a3445",
"versionType": "git"
},
{
"status": "affected",
"version": "427b3fc3d5244fef9c1f910a9c699f2690642f83",
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},
{
"status": "affected",
"version": "9c49181c201d434186ca6b1a7b52e29f4169f6f8",
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},
{
"status": "affected",
"version": "9808f032c4d971cbf2b01411a0a2a8ee0040efe3",
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},
{
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},
{
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"status": "affected",
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},
{
"lessThan": "5.10.235",
"status": "affected",
"version": "5.10.24",
"versionType": "semver"
},
{
"lessThan": "4.5",
"status": "affected",
"version": "4.4.262",
"versionType": "semver"
},
{
"lessThan": "4.10",
"status": "affected",
"version": "4.9.262",
"versionType": "semver"
},
{
"lessThan": "4.15",
"status": "affected",
"version": "4.14.226",
"versionType": "semver"
},
{
"lessThan": "4.20",
"status": "affected",
"version": "4.19.181",
"versionType": "semver"
},
{
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"status": "affected",
"version": "5.11.7",
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "5.12"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.4.291",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.10.235",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.15.179",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.129",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.76",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.13.*",
"status": "unaffected",
"version": "6.13.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.14",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.291",
"versionStartIncluding": "5.4.106",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.235",
"versionStartIncluding": "5.10.24",
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},
{
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},
{
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.76",
"versionStartIncluding": "5.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.13",
"versionStartIncluding": "5.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.13.2",
"versionStartIncluding": "5.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.14",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.9.262",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.19.181",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.11.7",
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: davicom: fix UAF in dm9000_drv_remove\n\ndm is netdev private data and it cannot be\nused after free_netdev() call. Using dm after free_netdev()\ncan cause UAF bug. Fix it by moving free_netdev() at the end of the\nfunction.\n\nThis is similar to the issue fixed in commit\nad297cd2db89 (\"net: qcom/emac: fix UAF in emac_remove\").\n\nThis bug is detected by our static analysis tool."
}
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CVE-2025-22036 (GCVE-0-2025-22036)
Vulnerability from cvelistv5 – Published: 2025-04-16 14:11 – Updated: 2026-08-05 11:56
VLAI
EPSS
VEX
Title
exfat: fix random stack corruption after get_block
Summary
In the Linux kernel, the following vulnerability has been resolved:
exfat: fix random stack corruption after get_block
When get_block is called with a buffer_head allocated on the stack, such
as do_mpage_readpage, stack corruption due to buffer_head UAF may occur in
the following race condition situation.
<CPU 0> <CPU 1>
mpage_read_folio
<<bh on stack>>
do_mpage_readpage
exfat_get_block
bh_read
__bh_read
get_bh(bh)
submit_bh
wait_on_buffer
...
end_buffer_read_sync
__end_buffer_read_notouch
unlock_buffer
<<keep going>>
...
...
...
...
<<bh is not valid out of mpage_read_folio>>
.
.
another_function
<<variable A on stack>>
put_bh(bh)
atomic_dec(bh->b_count)
* stack corruption here *
This patch returns -EAGAIN if a folio does not have buffers when bh_read
needs to be called. By doing this, the caller can fallback to functions
like block_read_full_folio(), create a buffer_head in the folio, and then
call get_block again.
Let's do not call bh_read() with on-stack buffer_head.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 17:04 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
11a347fb6cef62ce47e84b97c45f2b2497c7593b , < 49b0a6ab8e528a0c1c50e37cef9b9c7c121365f2
(git)
Affected: 11a347fb6cef62ce47e84b97c45f2b2497c7593b , < f7447286363dc1e410bf30b87d75168f3519f9cc (git) Affected: 11a347fb6cef62ce47e84b97c45f2b2497c7593b , < f807a6bf2005740fa26b4f59c4a003dc966b9afd (git) Affected: 11a347fb6cef62ce47e84b97c45f2b2497c7593b , < 1bb7ff4204b6d4927e982cd256286c09ed4fd8ca (git) |
|
| Linux | Linux |
Affected:
6.8
Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.23 , ≤ 6.12.* (semver) Unaffected: 6.13.11 , ≤ 6.13.* (semver) Unaffected: 6.14.2 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix) |
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CVE-2025-38352 (GCVE-0-2025-38352)
Vulnerability from cvelistv5 – Published: 2025-07-22 08:04 – Updated: 2026-08-05 12:01
VLAI
EPSS
VEX
Title
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
Summary
In the Linux kernel, the following vulnerability has been resolved:
posix-cpu-timers: fix race between handle_posix_cpu_timers() and posix_cpu_timer_del()
If an exiting non-autoreaping task has already passed exit_notify() and
calls handle_posix_cpu_timers() from IRQ, it can be reaped by its parent
or debugger right after unlock_task_sighand().
If a concurrent posix_cpu_timer_del() runs at that moment, it won't be
able to detect timer->it.cpu.firing != 0: cpu_timer_task_rcu() and/or
lock_task_sighand() will fail.
Add the tsk->exit_state check into run_posix_cpu_timers() to fix this.
This fix is not needed if CONFIG_POSIX_CPU_TIMERS_TASK_WORK=y, because
exit_task_work() is called before exit_notify(). But the check still
makes sense, task_work_add(&tsk->posix_cputimers_work.work) will fail
anyway in this case.
Severity
7.8 (High)
7.4 (High)
SSVC
Exploitation: active
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-09-05 03:55 UTC
CWE
- CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition
Assigner
References
12 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
0bdd2ed4138ec04e09b4f8165981efc99e439f55 , < 78a4b8e3795b31dae58762bc091bb0f4f74a2200
(git)
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|
| Linux | Linux |
Affected:
2.6.36
Unaffected: 0 , < 2.6.36 (semver) Unaffected: 5.4.295 , ≤ 5.4.* (semver) Unaffected: 5.10.239 , ≤ 5.10.* (semver) Unaffected: 5.15.186 , ≤ 5.15.* (semver) Unaffected: 6.1.142 , ≤ 6.1.* (semver) Unaffected: 6.6.94 , ≤ 6.6.* (semver) Unaffected: 6.12.34 , ≤ 6.12.* (semver) Unaffected: 6.15.3 , ≤ 6.15.* (semver) Unaffected: 6.16 , ≤ * (original_commit_for_fix) |
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CVE-2025-39993 (GCVE-0-2025-39993)
Vulnerability from cvelistv5 – Published: 2025-10-15 07:58 – Updated: 2026-08-05 12:06
VLAI
EPSS
VEX
Title
media: rc: fix races with imon_disconnect()
Summary
In the Linux kernel, the following vulnerability has been resolved:
media: rc: fix races with imon_disconnect()
Syzbot reports a KASAN issue as below:
BUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline]
BUG: KASAN: use-after-free in send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627
Read of size 4 at addr ffff8880256fb000 by task syz-executor314/4465
CPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:317 [inline]
print_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433
kasan_report+0xb1/0x1e0 mm/kasan/report.c:495
__create_pipe include/linux/usb.h:1945 [inline]
send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627
vfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991
vfs_write+0x2d7/0xdd0 fs/read_write.c:576
ksys_write+0x127/0x250 fs/read_write.c:631
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
The iMON driver improperly releases the usb_device reference in
imon_disconnect without coordinating with active users of the
device.
Specifically, the fields usbdev_intf0 and usbdev_intf1 are not
protected by the users counter (ictx->users). During probe,
imon_init_intf0 or imon_init_intf1 increments the usb_device
reference count depending on the interface. However, during
disconnect, usb_put_dev is called unconditionally, regardless of
actual usage.
As a result, if vfd_write or other operations are still in
progress after disconnect, this can lead to a use-after-free of
the usb_device pointer.
Thread 1 vfd_write Thread 2 imon_disconnect
...
if
usb_put_dev(ictx->usbdev_intf0)
else
usb_put_dev(ictx->usbdev_intf1)
...
while
send_packet
if
pipe = usb_sndintpipe(
ictx->usbdev_intf0) UAF
else
pipe = usb_sndctrlpipe(
ictx->usbdev_intf0, 0) UAF
Guard access to usbdev_intf0 and usbdev_intf1 after disconnect by
checking ictx->disconnected in all writer paths. Add early return
with -ENODEV in send_packet(), vfd_write(), lcd_write() and
display_open() if the device is no longer present.
Set and read ictx->disconnected under ictx->lock to ensure memory
synchronization. Acquire the lock in imon_disconnect() before setting
the flag to synchronize with any ongoing operations.
Ensure writers exit early and safely after disconnect before the USB
core proceeds with cleanup.
Found by Linux Verification Center (linuxtesting.org) with Syzkaller.
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 16:12 UTC
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
21677cfc562a27e099719d413287bc8d1d24deb7 , < 9348976003e39754af344949579e824a0a210fc4
(git)
Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < b03fac6e2a38331faf8510b480becfa90cea1c9f (git) Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 71c52b073922d05e79e6de7fc7f5f38f927929a4 (git) Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 71096a6161a25e84acddb89a9d77f138502d26ab (git) Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 71da40648741d15b302700b68973fe8b382aef3c (git) Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5 (git) Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < d9f6ce99624a41c3bcb29a8d7d79b800665229dd (git) Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < 2e7fd93b9cc565b839bc55a6662475718963e156 (git) Affected: 21677cfc562a27e099719d413287bc8d1d24deb7 , < fa0f61cc1d828178aa921475a9b786e7fbb65ccb (git) |
|
| Linux | Linux |
Affected:
2.6.35
Unaffected: 0 , < 2.6.35 (semver) Unaffected: 5.4.301 , ≤ 5.4.* (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.195 , ≤ 5.15.* (semver) Unaffected: 6.1.156 , ≤ 6.1.* (semver) Unaffected: 6.6.110 , ≤ 6.6.* (semver) Unaffected: 6.12.51 , ≤ 6.12.* (semver) Unaffected: 6.16.11 , ≤ 6.16.* (semver) Unaffected: 6.17.1 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: rc: fix races with imon_disconnect()\n\nSyzbot reports a KASAN issue as below:\nBUG: KASAN: use-after-free in __create_pipe include/linux/usb.h:1945 [inline]\nBUG: KASAN: use-after-free in send_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627\nRead of size 4 at addr ffff8880256fb000 by task syz-executor314/4465\n\nCPU: 2 PID: 4465 Comm: syz-executor314 Not tainted 6.0.0-rc1-syzkaller #0\nHardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014\nCall Trace:\n \u003cTASK\u003e\n__dump_stack lib/dump_stack.c:88 [inline]\ndump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106\nprint_address_description mm/kasan/report.c:317 [inline]\nprint_report.cold+0x2ba/0x6e9 mm/kasan/report.c:433\nkasan_report+0xb1/0x1e0 mm/kasan/report.c:495\n__create_pipe include/linux/usb.h:1945 [inline]\nsend_packet+0xa2d/0xbc0 drivers/media/rc/imon.c:627\nvfd_write+0x2d9/0x550 drivers/media/rc/imon.c:991\nvfs_write+0x2d7/0xdd0 fs/read_write.c:576\nksys_write+0x127/0x250 fs/read_write.c:631\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThe iMON driver improperly releases the usb_device reference in\nimon_disconnect without coordinating with active users of the\ndevice.\n\nSpecifically, the fields usbdev_intf0 and usbdev_intf1 are not\nprotected by the users counter (ictx-\u003eusers). During probe,\nimon_init_intf0 or imon_init_intf1 increments the usb_device\nreference count depending on the interface. However, during\ndisconnect, usb_put_dev is called unconditionally, regardless of\nactual usage.\n\nAs a result, if vfd_write or other operations are still in\nprogress after disconnect, this can lead to a use-after-free of\nthe usb_device pointer.\n\nThread 1 vfd_write Thread 2 imon_disconnect\n ...\n if\n usb_put_dev(ictx-\u003eusbdev_intf0)\n else\n usb_put_dev(ictx-\u003eusbdev_intf1)\n...\nwhile\n send_packet\n if\n pipe = usb_sndintpipe(\n ictx-\u003eusbdev_intf0) UAF\n else\n pipe = usb_sndctrlpipe(\n ictx-\u003eusbdev_intf0, 0) UAF\n\nGuard access to usbdev_intf0 and usbdev_intf1 after disconnect by\nchecking ictx-\u003edisconnected in all writer paths. Add early return\nwith -ENODEV in send_packet(), vfd_write(), lcd_write() and\ndisplay_open() if the device is no longer present.\n\nSet and read ictx-\u003edisconnected under ictx-\u003elock to ensure memory\nsynchronization. Acquire the lock in imon_disconnect() before setting\nthe flag to synchronize with any ongoing operations.\n\nEnsure writers exit early and safely after disconnect before the USB\ncore proceeds with cleanup.\n\nFound by Linux Verification Center (linuxtesting.org) with Syzkaller."
}
],
"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 vulnerable code is reached through an ordinary `write(2)` syscall on the `/dev/lcd0` character device (`vfd_write`/`lcd_write` \u2192 `send_packet`), i.e. a local attack surface reached via a device file, with no network exposure. The disconnect that frees the `usb_device` is a triggering condition the attacker supplies (their own removable/emulated iMON device or an unplug event), not the attack interface itself.\nAC:L - The attacker controls both sides of the race: they drive an unbounded loop of `write()` calls that hold `ictx-\u003elock` for seconds at a time (`send_packet` waits up to 10 s per packet, six packets per write) while triggering device removal, giving an extremely wide and repeatable window. Syzkaller reproduces it, and failed attempts are harmless, so it can be retried until it lands.\nPR:L - No capability, `CAP_SYS_ADMIN`, or other privilege check exists anywhere on the path \u2014 `display_open()` only checks `display_supported`/`display_isopen`, and `vfd_write`/`lcd_write` go straight to `send_packet()`. Any unprivileged process able to open the display node (routinely group-accessible on media/HTPC systems, and the node the LIRC/LCDproc userspace stack writes to) can trigger it.\nUI:N - The attacker\u0027s own process performs the writes, and the disconnect side is produced by the attacker\u0027s device or unplug action rather than by a victim. No action by another user is needed at any point.\nS:U - The use-after-free corrupts kernel memory within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossed.\nC:H - The freed `struct usb_device` is read via `__create_pipe()` (`dev-\u003edevnum`) and then throughout `usb_submit_urb()` (`dev-\u003estate`, `dev-\u003eep_out[]`, `dev-\u003ebus`), so an attacker who reclaims the slab object can read back kernel data and pointers, and the UAF is a general primitive for arbitrary memory disclosure.\nI:H - The stale pointer is stored into the URB and submitted, causing `usb_get_dev(urb-\u003edev)` to write (atomic increment) into freed memory and `bus_to_hcd(urb-\u003edev-\u003ebus)-\u003edriver-\u003eurb_enqueue()` to make an indirect call through a chain rooted in attacker-reclaimable memory \u2014 a control-flow hijack and arbitrary-write primitive.\nA:H - Even without heap grooming, dereferencing and submitting an URB against a freed `usb_device` reliably produces a KASAN splat, oops, or panic, as shown in the syzbot report, and the attacker can repeat it at will."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:06:58.054Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/9348976003e39754af344949579e824a0a210fc4"
},
{
"url": "https://git.kernel.org/stable/c/b03fac6e2a38331faf8510b480becfa90cea1c9f"
},
{
"url": "https://git.kernel.org/stable/c/71c52b073922d05e79e6de7fc7f5f38f927929a4"
},
{
"url": "https://git.kernel.org/stable/c/71096a6161a25e84acddb89a9d77f138502d26ab"
},
{
"url": "https://git.kernel.org/stable/c/71da40648741d15b302700b68973fe8b382aef3c"
},
{
"url": "https://git.kernel.org/stable/c/fd5d3e6b149ec8cce045d86a2b5e3664d6b32ba5"
},
{
"url": "https://git.kernel.org/stable/c/d9f6ce99624a41c3bcb29a8d7d79b800665229dd"
},
{
"url": "https://git.kernel.org/stable/c/2e7fd93b9cc565b839bc55a6662475718963e156"
},
{
"url": "https://git.kernel.org/stable/c/fa0f61cc1d828178aa921475a9b786e7fbb65ccb"
}
],
"title": "media: rc: fix races with imon_disconnect()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39993",
"datePublished": "2025-10-15T07:58:18.621Z",
"dateReserved": "2025-04-16T07:20:57.150Z",
"dateUpdated": "2026-08-05T12:06:58.054Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Trend slope:
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(linear fit over daily sighting counts)
Show additional events:
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
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.
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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