{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2025-38639", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-04-16T04:51:24.030Z", "datePublished": "2025-08-22T16:00:45.953Z", "dateUpdated": "2026-08-05T12:03:37.449Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:03:37.449Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: xt_nfacct: don't assume acct name is null-terminated\n\nBUG: KASAN: slab-out-of-bounds in .. lib/vsprintf.c:721\nRead of size 1 at addr ffff88801eac95c8 by task syz-executor183/5851\n[..]\n string+0x231/0x2b0 lib/vsprintf.c:721\n vsnprintf+0x739/0xf00 lib/vsprintf.c:2874\n [..]\n nfacct_mt_checkentry+0xd2/0xe0 net/netfilter/xt_nfacct.c:41\n xt_check_match+0x3d1/0xab0 net/netfilter/x_tables.c:523\n\nnfnl_acct_find_get() handles non-null input, but the error\nprintk relied on its presence." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The vulnerable checkentry path is only reachable through local syscalls — `setsockopt(IPT_SO_SET_REPLACE)` on a raw socket, nfnetlink/nftables `nft_compat`, or tc `em_ipt` netlink. No remote peer data reaches this code.\nAC:L - Triggering is fully deterministic: submit one x_tables/nft rule with an `nfacct` match whose 32-byte name field contains no NUL byte and names a non-existent accounting object. There is no race, and the attacker also controls the size and cache placement of the surrounding allocation, so even the grooming step is under their control.\nPR:L - Every entry point checks only `ns_capable(net->user_ns, CAP_NET_ADMIN)` / `netlink_net_capable()`, which an unprivileged user obtains over their own network namespace with `unshare -Urn` — the syzbot reproducer runs exactly this way.\nUI:N - The attacker performs the entire sequence themselves in a single process; no victim action, mount, or other interaction is involved.\nS:U - The out-of-bounds read and the resulting disclosure and crash are confined to the kernel's own security authority; no VM, IOMMU, or hypervisor boundary is crossed.\nC:H - `string_nocheck()` runs with precision -1, so the read past the 32-byte name field is unbounded — it copies adjacent heap memory into the kernel log until it happens to hit a NUL, and the attacker chooses the slab cache and can groom the neighbouring objects to place sensitive data (kernel pointers, other objects' contents) in the leak window.\nI:N - The defect is purely a read: `%s` performs no out-of-bounds write and vsnprintf's destination buffer remains correctly bounded, so no kernel data is modified and no write primitive is produced.\nA:H - The unbounded walk runs off the end of the allocation — a KASAN slab-out-of-bounds report (fatal with `panic_on_warn`, as syzbot observed), or on the `kvmalloc`/vmalloc path a read straight into the guard page, producing an unmapped-address oops." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/netfilter/xt_nfacct.c" ], "versions": [ { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "66d41268ede1e1b6e71ba28be923397ff0b2b9c3", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "e021a1eee196887536a6630c5492c23a4c78d452", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "b10cfa2de13d28ddd03210eb234422b7ec92725a", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "e18939176e657a3a20bfbed357b8c55a9f82aba3", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "58004aa21e79addaf41667bfe65e93ec51653f18", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "7c1ae471da69c09242834e956218ea6a42dd405a", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "58007fc7b94fb2702000045ff401eb7f5bde7828", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13", "status": "affected", "versionType": "git" }, { "version": "ceb98d03eac5704820f2ac1f370c9ff385e3a9f5", "lessThan": "bf58e667af7d96c8eb9411f926a0a0955f41ce21", "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/netfilter/xt_nfacct.c" ], "versions": [ { "version": "3.3", "status": "affected" }, { "version": "0", "lessThan": "3.3", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.297", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.241", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.190", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.148", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.102", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.42", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.15.10", "lessThanOrEqual": "6.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.16.1", "lessThanOrEqual": "6.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.17", "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": "3.3", "versionEndExcluding": "5.4.297" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.10.241" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "5.15.190" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.1.148" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.6.102" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.12.42" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.15.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.16.1" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.3", "versionEndExcluding": "6.17" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/66d41268ede1e1b6e71ba28be923397ff0b2b9c3" }, { "url": "https://git.kernel.org/stable/c/e021a1eee196887536a6630c5492c23a4c78d452" }, { "url": "https://git.kernel.org/stable/c/b10cfa2de13d28ddd03210eb234422b7ec92725a" }, { "url": "https://git.kernel.org/stable/c/e18939176e657a3a20bfbed357b8c55a9f82aba3" }, { "url": "https://git.kernel.org/stable/c/58004aa21e79addaf41667bfe65e93ec51653f18" }, { "url": "https://git.kernel.org/stable/c/7c1ae471da69c09242834e956218ea6a42dd405a" }, { "url": "https://git.kernel.org/stable/c/58007fc7b94fb2702000045ff401eb7f5bde7828" }, { "url": "https://git.kernel.org/stable/c/df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13" }, { "url": "https://git.kernel.org/stable/c/bf58e667af7d96c8eb9411f926a0a0955f41ce21" } ], "title": "netfilter: xt_nfacct: don't assume acct name is null-terminated", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html" }, { "url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T17:40:40.018Z" } } ] } }