CVE-2026-53247 (GCVE-0-2026-53247)
Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-06-28 06:40
VLAI?
Title
net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
mtk_free_dev() calls metadata_dst_free() which frees the metadata_dst
with kfree() immediately, bypassing the RCU grace period.
In the RX path, skb_dst_set_noref() sets a non-refcounted pointer from
the skb to the metadata_dst. This function requires RCU read-side
protection and the dst must remain valid until all RCU readers complete.
Since metadata_dst_free() calls kfree() directly, a use-after-free can
occur if any skb still holds a noref pointer to the dst when the driver
tears it down.
Replace metadata_dst_free() with dst_release() which properly goes
through the refcount path: when the refcount drops to zero, it schedules
the actual free via call_rcu_hurry(), ensuring all RCU readers have
completed before the memory is freed.
Severity ?
9.8 (Critical)
Assigner
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Affected:
2d7605a729062bb554f03c5983d8cfb8c0b42e9c , < 72775977e89c25c99ee84d2c5baa3f86a8ba5cb4
(git)
Affected: 2d7605a729062bb554f03c5983d8cfb8c0b42e9c , < 459c6f35c58cf0fd5247e55d73ddaa29571d9b7e (git) Affected: 2d7605a729062bb554f03c5983d8cfb8c0b42e9c , < e634408d2b0cd939cfe019398a21fb47b7a8ffe3 (git) Affected: 2d7605a729062bb554f03c5983d8cfb8c0b42e9c , < 2d86aeb46d5f69c704065a8c69822582787272a1 (git) Affected: 2d7605a729062bb554f03c5983d8cfb8c0b42e9c , < 80df409e1a483676826a6c66e693dba6ac507751 (git) |
||
{
"containers": {
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"product": "Linux",
"programFiles": [
"drivers/net/ethernet/mediatek/mtk_eth_soc.c"
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],
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"vendor": "Linux",
"versions": [
{
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"status": "unaffected",
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{
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"status": "unaffected",
"version": "6.12.94",
"versionType": "semver"
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{
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"status": "unaffected",
"version": "6.18.36",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown\n\nmtk_free_dev() calls metadata_dst_free() which frees the metadata_dst\nwith kfree() immediately, bypassing the RCU grace period.\nIn the RX path, skb_dst_set_noref() sets a non-refcounted pointer from\nthe skb to the metadata_dst. This function requires RCU read-side\nprotection and the dst must remain valid until all RCU readers complete.\nSince metadata_dst_free() calls kfree() directly, a use-after-free can\noccur if any skb still holds a noref pointer to the dst when the driver\ntears it down.\nReplace metadata_dst_free() with dst_release() which properly goes\nthrough the refcount path: when the refcount drops to zero, it schedules\nthe actual free via call_rcu_hurry(), ensuring all RCU readers have\ncompleted before the memory is freed."
}
],
"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"
}
}
],
"providerMetadata": {
"dateUpdated": "2026-06-28T06:40:53.820Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/72775977e89c25c99ee84d2c5baa3f86a8ba5cb4"
},
{
"url": "https://git.kernel.org/stable/c/459c6f35c58cf0fd5247e55d73ddaa29571d9b7e"
},
{
"url": "https://git.kernel.org/stable/c/e634408d2b0cd939cfe019398a21fb47b7a8ffe3"
},
{
"url": "https://git.kernel.org/stable/c/2d86aeb46d5f69c704065a8c69822582787272a1"
},
{
"url": "https://git.kernel.org/stable/c/80df409e1a483676826a6c66e693dba6ac507751"
}
],
"title": "net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown",
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"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-53247",
"datePublished": "2026-06-25T08:39:40.654Z",
"dateReserved": "2026-06-09T07:44:35.394Z",
"dateUpdated": "2026-06-28T06:40:53.820Z",
"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 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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