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vuln-cve/data/2026/52xxx/CVE-2026-52922.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-52922",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-06-09T07:44:35.367Z",
"datePublished": "2026-06-24T07:14:17.185Z",
"dateUpdated": "2026-08-05T12:31:43.495Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T12:31:43.495Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: dat: handle forward allocation error\n\nbatadv_dat_forward_data() calls pskb_copy_for_clone() to duplicate an skb\nfor each DHT candidate, but does not check the return value before passing\nit to batadv_send_skb_prepare_unicast_4addr(). That function dereferences\nthe skb unconditionally, so a failed allocation triggers a NULL pointer\ndereference.\n\nSkip forwarding to the current DHT candidate on allocation failure."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"baseScore": 7.5,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - The vulnerable DAT forwarding path is reachable through attacker-supplied batman-adv mesh traffic carrying ARP/DHCP payloads, processed in the kernel receive/network path without a local syscall. Scoring the highest defensible deployment, a remote mesh participant can send packets to the affected node.\nAC:L - The packet format checks are straightforward and DAT is enabled by default when built; the attacker can repeatedly send valid ARP/DHCP-triggering traffic toward DAT candidates. Although the NULL dereference requires `GFP_ATOMIC` allocation failure, traffic flooding can plausibly create or hit that condition, so the higher-severity AC:L is selected.\nPR:N - The receive path has no authentication or authorization gate for a peer that can transmit batman-adv mesh packets to the node. Privileges are only needed to configure the victim mesh, not to trigger the bug as a remote sender.\nUI:N - No victim user action is required after the affected batman-adv mesh is active. The attacker triggers the path by sending network traffic.\nS:U - The impact is within the vulnerable kernel instance and does not cross a separate security authority such as a hypervisor or sandbox boundary. Standard kernel availability impact is scope unchanged.\nC:N - The bug is a NULL `skb` dereference after `pskb_copy_for_clone()` failure, not a use-after-free or out-of-bounds access. The investigated path shows no attacker-controlled memory disclosure primitive.\nI:N - The NULL pointer is dereferenced immediately in skb header preparation and does not provide an attacker-controlled write or control-flow primitive. There is no evidence of memory corruption beyond the crash.\nA:H - A failed allocation leads to an unchecked NULL pointer dereference in kernel networking code. This can oops or panic the kernel, causing high availability impact."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/batman-adv/distributed-arp-table.c"
],
"versions": [
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"lessThan": "9bcebaedfb8479cb4affb23c7a0d000ca9a20e73",
"status": "affected",
"versionType": "git"
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"status": "affected",
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"lessThan": "ce0c381199402a2c58f4599f4f6ed100d872d0da",
"status": "affected",
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{
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{
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"status": "affected",
"versionType": "git"
},
{
"version": "785ea1144182c341b8b85b0f8180291839d176a8",
"lessThan": "cf48e75fc4fe0d5cc7721c82d454221d01367b93",
"status": "affected",
"versionType": "git"
},
{
"version": "785ea1144182c341b8b85b0f8180291839d176a8",
"lessThan": "2d8826a2d3657cea66fb0370f9e521575a673871",
"status": "affected",
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}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/batman-adv/distributed-arp-table.c"
],
"versions": [
{
"version": "3.8",
"status": "affected"
},
{
"version": "0",
"lessThan": "3.8",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.258",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.209",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.175",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.142",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.92",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.34",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.0.11",
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.1",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
"versionEndExcluding": "5.10.258"
},
{
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"versionStartIncluding": "3.8",
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "3.8",
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],
"references": [
{
"url": "https://git.kernel.org/stable/c/9bcebaedfb8479cb4affb23c7a0d000ca9a20e73"
},
{
"url": "https://git.kernel.org/stable/c/2edb8aeb3cdda9d00ec4997252dc5bcd6f54d8ef"
},
{
"url": "https://git.kernel.org/stable/c/ce0c381199402a2c58f4599f4f6ed100d872d0da"
},
{
"url": "https://git.kernel.org/stable/c/866ac1d57040ed0b44ca732e3c66b3aa6b93011c"
},
{
"url": "https://git.kernel.org/stable/c/4d420d9ee70a220a2cd95aa0dd2e15acad66a505"
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{
"url": "https://git.kernel.org/stable/c/9cceea8eeba710def2a5707ee00f00c74a9a1cac"
},
{
"url": "https://git.kernel.org/stable/c/cf48e75fc4fe0d5cc7721c82d454221d01367b93"
},
{
"url": "https://git.kernel.org/stable/c/2d8826a2d3657cea66fb0370f9e521575a673871"
}
],
"title": "batman-adv: dat: handle forward allocation error",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
}
}
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