CVE-2025-38639 (GCVE-0-2025-38639)
Vulnerability from cvelistv5 – Published: 2025-08-22 16:00 – Updated: 2026-08-05 12:03
VLAI
EPSS
VEX
Title
netfilter: xt_nfacct: don't assume acct name is null-terminated
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: xt_nfacct: don't assume acct name is null-terminated
BUG: KASAN: slab-out-of-bounds in .. lib/vsprintf.c:721
Read of size 1 at addr ffff88801eac95c8 by task syz-executor183/5851
[..]
string+0x231/0x2b0 lib/vsprintf.c:721
vsnprintf+0x739/0xf00 lib/vsprintf.c:2874
[..]
nfacct_mt_checkentry+0xd2/0xe0 net/netfilter/xt_nfacct.c:41
xt_check_match+0x3d1/0xab0 net/netfilter/x_tables.c:523
nfnl_acct_find_get() handles non-null input, but the error
printk relied on its presence.
Severity
7.1 (High)
Assigner
References
11 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < 66d41268ede1e1b6e71ba28be923397ff0b2b9c3
(git)
Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < e021a1eee196887536a6630c5492c23a4c78d452 (git) Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < b10cfa2de13d28ddd03210eb234422b7ec92725a (git) Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < e18939176e657a3a20bfbed357b8c55a9f82aba3 (git) Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < 58004aa21e79addaf41667bfe65e93ec51653f18 (git) Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < 7c1ae471da69c09242834e956218ea6a42dd405a (git) Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < 58007fc7b94fb2702000045ff401eb7f5bde7828 (git) Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13 (git) Affected: ceb98d03eac5704820f2ac1f370c9ff385e3a9f5 , < bf58e667af7d96c8eb9411f926a0a0955f41ce21 (git) |
guessed | |
| Linux | Linux |
Affected:
3.3
Unaffected: 0 , < 3.3 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.148 , ≤ 6.1.* (semver) Unaffected: 6.6.102 , ≤ 6.6.* (semver) Unaffected: 6.12.42 , ≤ 6.12.* (semver) Unaffected: 6.15.10 , ≤ 6.15.* (semver) Unaffected: 6.16.1 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed |
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}
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"version": "3.1"
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"value": "AV:L - The vulnerable checkentry path is only reachable through local syscalls \u2014 `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-\u003euser_ns, CAP_NET_ADMIN)` / `netlink_net_capable()`, which an unprivileged user obtains over their own network namespace with `unshare -Urn` \u2014 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\u0027s 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 \u2014 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\u0027 contents) in the leak window.\nI:N - The defect is purely a read: `%s` performs no out-of-bounds write and vsnprintf\u0027s 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 \u2014 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."
}
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}
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"url": "https://git.kernel.org/stable/c/bf58e667af7d96c8eb9411f926a0a0955f41ce21"
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"title": "netfilter: xt_nfacct: don\u0027t assume acct name is null-terminated",
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"datePublished": "2025-08-22T16:00:45.953Z",
"dateReserved": "2025-04-16T04:51:24.030Z",
"dateUpdated": "2026-08-05T12:03:37.449Z",
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"date": "2026-09-16",
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"product_status:fixed": "2",
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"source": "Microsoft CSAF VEX",
"status": "final",
"title": "netfilter: xt_nfacct: don\u0027t assume acct name is null-terminated",
"url": "https://msrc.microsoft.com/csaf/vex/2025/msrc_cve-2025-38639.json",
"version": "3"
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"nvd": "{\"cve\":{\"id\":\"CVE-2025-38639\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-08-22T16:15:37.850\",\"lastModified\":\"2026-07-30T06:23:32.320\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: xt_nfacct: don\u0027t 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.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: xt_nfacct: no asuma que el nombre de la cuenta termina en nulo BUG: KASAN: slab-out-of-bounds in .. lib/vsprintf.c:721 Read of size 1 at addr ffff88801eac95c8 by task syz-executor183/5851 [..] string+0x231/0x2b0 lib/vsprintf.c:721 vsnprintf+0x739/0xf00 lib/vsprintf.c:2874 [..] nfacct_mt_checkentry+0xd2/0xe0 net/netfilter/xt_nfacct.c:41 xt_check_match+0x3d1/0xab0 net/netfilter/x_tables.c:523 nfnl_acct_find_get() maneja entradas no nulas, pero el error printk depend\u00eda de su presencia.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/xt_nfacct.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"66d41268ede1e1b6e71ba28be923397ff0b2b9c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"e021a1eee196887536a6630c5492c23a4c78d452\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"b10cfa2de13d28ddd03210eb234422b7ec92725a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"e18939176e657a3a20bfbed357b8c55a9f82aba3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"58004aa21e79addaf41667bfe65e93ec51653f18\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"7c1ae471da69c09242834e956218ea6a42dd405a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"58007fc7b94fb2702000045ff401eb7f5bde7828\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ceb98d03eac5704820f2ac1f370c9ff385e3a9f5\",\"lessThan\":\"bf58e667af7d96c8eb9411f926a0a0955f41ce21\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/xt_nfacct.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.3\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.3\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.297\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.241\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.190\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.148\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.102\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.42\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.10\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16.1\",\"lessThanOrEqual\":\"6.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.17\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.2},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-Other\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"3.3\",\"versionEndExcluding\":\"5.4.297\",\"matchCriteriaId\":\"F9EF127A-4F73-4925-A51C-312B1712285F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.241\",\"matchCriteriaId\":\"D0D21C35-EB8A-488A-BBF9-403E4817E5DD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.190\",\"matchCriteriaId\":\"AD9E597F-3DDE-4D7E-976C-463D0611F13F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.148\",\"matchCriteriaId\":\"3E5B1B93-C244-4B54-B3AB-12C2635A443B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.2\",\"versionEndExcluding\":\"6.6.102\",\"matchCriteriaId\":\"DD6EDB96-08AC-49D8-A1A9-4D2140C49BC7\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.7\",\"versionEndExcluding\":\"6.12.42\",\"matchCriteriaId\":\"EA7AA5E6-4376-4A85-A021-6ACC5FF801C3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.13\",\"versionEndExcluding\":\"6.15.10\",\"matchCriteriaId\":\"5890C690-B295-40C2-9121-FF5F987E5142\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"6.16\",\"versionEndExcluding\":\"6.16.1\",\"matchCriteriaId\":\"58182352-D7DF-4CC9-841E-03C1D852C3FB\"}]}]},{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*\",\"matchCriteriaId\":\"FA6FEEC2-9F11-4643-8827-749718254FED\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/58004aa21e79addaf41667bfe65e93ec51653f18\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/58007fc7b94fb2702000045ff401eb7f5bde7828\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/66d41268ede1e1b6e71ba28be923397ff0b2b9c3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/7c1ae471da69c09242834e956218ea6a42dd405a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/b10cfa2de13d28ddd03210eb234422b7ec92725a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/bf58e667af7d96c8eb9411f926a0a0955f41ce21\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/df13c9c6ce1d55c31d1bd49db65a7fbbd86aab13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e021a1eee196887536a6630c5492c23a4c78d452\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/e18939176e657a3a20bfbed357b8c55a9f82aba3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-07-30T09:03:22+00:00",
"cve": "CVE-2025-38639",
"id": "CVE-2025-38639",
"initial_release_date": "2025-08-22T00:00:00+00:00",
"product_status:known_affected": "28",
"product_status:known_not_affected": "246",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: netfilter: xt_nfacct: don\u0027t assume acct name is null-terminated",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38639.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-03T00:14:14Z",
"cve": "CVE-2025-38639",
"id": "CVE-2025-38639",
"initial_release_date": "2025-08-22T23:28:45Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "733",
"product_status:known_not_affected": "11",
"product_status:recommended": "509",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-38639",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38639.json",
"version": "48"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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