{ "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": [ { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "9bcebaedfb8479cb4affb23c7a0d000ca9a20e73", "status": "affected", "versionType": "git" }, { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "2edb8aeb3cdda9d00ec4997252dc5bcd6f54d8ef", "status": "affected", "versionType": "git" }, { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "ce0c381199402a2c58f4599f4f6ed100d872d0da", "status": "affected", "versionType": "git" }, { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "866ac1d57040ed0b44ca732e3c66b3aa6b93011c", "status": "affected", "versionType": "git" }, { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "4d420d9ee70a220a2cd95aa0dd2e15acad66a505", "status": "affected", "versionType": "git" }, { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "9cceea8eeba710def2a5707ee00f00c74a9a1cac", "status": "affected", "versionType": "git" }, { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "cf48e75fc4fe0d5cc7721c82d454221d01367b93", "status": "affected", "versionType": "git" }, { "version": "785ea1144182c341b8b85b0f8180291839d176a8", "lessThan": "2d8826a2d3657cea66fb0370f9e521575a673871", "status": "affected", "versionType": "git" } ] }, { "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" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "5.15.209" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.1.175" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.6.142" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.12.92" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "6.18.34" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "7.0.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.8", "versionEndExcluding": "7.1" } ] } ] } ], "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" }, { "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" } } } }