{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-21680", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-12-29T08:45:45.738Z", "datePublished": "2025-01-31T11:25:40.831Z", "dateUpdated": "2026-08-05T11:53:35.511Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:53:35.511Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npktgen: Avoid out-of-bounds access in get_imix_entries\n\nPassing a sufficient amount of imix entries leads to invalid access to the\npkt_dev->imix_entries array because of the incorrect boundary check.\n\nUBSAN: array-index-out-of-bounds in net/core/pktgen.c:874:24\nindex 20 is out of range for type 'imix_pkt [20]'\nCPU: 2 PID: 1210 Comm: bash Not tainted 6.10.0-rc1 #121\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nCall Trace:\n\ndump_stack_lvl lib/dump_stack.c:117\n__ubsan_handle_out_of_bounds lib/ubsan.c:429\nget_imix_entries net/core/pktgen.c:874\npktgen_if_write net/core/pktgen.c:1063\npde_write fs/proc/inode.c:334\nproc_reg_write fs/proc/inode.c:346\nvfs_write fs/read_write.c:593\nksys_write fs/read_write.c:644\ndo_syscall_64 arch/x86/entry/common.c:83\nentry_SYSCALL_64_after_hwframe arch/x86/entry/entry_64.S:130\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE.\n\n[ fp: allow to fill the array completely; minor changelog cleanup ]" } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable parser is reached only by write(2) to /proc/net/pktgen/, requiring local access to the machine. No network-facing path reaches get_imix_entries().\nAC:L - A single deterministic write() of 21 \"size,weight\" pairs triggers the out-of-bounds write every time; there is no race, timing window, or memory-layout condition outside the attacker's control.\nPR:L - pktgen_if_write() and pktgen_thread_write() contain no capable() check at all, and under `unshare -Urn` the /proc/net/pktgen entries inherit the netns owner's uid (proc_net_ns_init sets /proc/net to make_kuid(net->user_ns, 0)), so an ordinary unprivileged user owns the 0600 files in their own namespace.\nUI:N - The attacker performs the entire sequence themselves — create the namespace, add the device, write the imix string — with no action by any other user.\nS:U - The corruption is confined to kernel memory within the same security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - The overwritten imix_distribution[] bytes become the array index in mod_cur_headers(), turning the bug into an out-of-bounds read of up to ~6 KB past the pktgen_dev allocation whose contents are echoed back through cur_pkt_size in the /proc output.\nI:H - This is an out-of-bounds write of 16 fully attacker-controlled bytes past imix_entries[], and the resulting corrupted index yields a further OOB increment (entry->count_so_far++) into neighbouring slab objects at an attacker-selected offset.\nA:H - The out-of-bounds access traps under CONFIG_UBSAN_BOUNDS/UBSAN_TRAP (and panics with panic_on_warn), and the stale n_imix_entries=21 plus corrupted distribution drives further OOB accesses and bogus cur_pkt_size values into skb allocation, causing kernel crashes." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/pktgen.c" ], "versions": [ { "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f", "lessThan": "3450092cc2d1c311c5ea92a2486daa2a33520ea5", "status": "affected", "versionType": "git" }, { "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f", "lessThan": "e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486", "status": "affected", "versionType": "git" }, { "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f", "lessThan": "7cde21f52042aa2e29a654458166b873d2ae66b3", "status": "affected", "versionType": "git" }, { "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f", "lessThan": "1a9b65c672ca9dc4ba52ca2fd54329db9580ce29", "status": "affected", "versionType": "git" }, { "version": "52a62f8603f97e720882c8f5aff2767ac6a11d5f", "lessThan": "76201b5979768500bca362871db66d77cb4c225e", "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/core/pktgen.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.177", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.127", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.74", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.11", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.13", "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": "5.15", "versionEndExcluding": "5.15.177" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.127" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6.74" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.12.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/3450092cc2d1c311c5ea92a2486daa2a33520ea5" }, { "url": "https://git.kernel.org/stable/c/e5d24a7074dcd0c7e76b7e7e4efbbe7418d62486" }, { "url": "https://git.kernel.org/stable/c/7cde21f52042aa2e29a654458166b873d2ae66b3" }, { "url": "https://git.kernel.org/stable/c/1a9b65c672ca9dc4ba52ca2fd54329db9580ce29" }, { "url": "https://git.kernel.org/stable/c/76201b5979768500bca362871db66d77cb4c225e" } ], "title": "pktgen: Avoid out-of-bounds access in get_imix_entries", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2025-21680", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-10-01T19:51:54.428740Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-129", "description": "CWE-129 Improper Validation of Array Index" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T19:57:11.468Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T20:58:57.266Z" } } ] } }