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BELL-CVE-2026-43114 (CVE-2026-43114)
Vulnerability from osv_bellsoft – Published: 2026-05-07 06:08 – Updated: 2026-06-24 20:14 – Source website
VLAI
Severity
9.4 (Critical)
References
| URL | Type | |
|---|---|---|
{
"affected": [
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"ecosystem": "Alpaquita:23",
"name": "linux-lts",
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{
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"id": "BELL-CVE-2026-43114",
"modified": "2026-06-24T20:14:44.42733Z",
"published": "2026-05-07T06:08:58.933568Z",
"references": [
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CVE-2026-43114 (GCVE-0-2026-43114)
Vulnerability from cvelistv5 – Published: 2026-05-06 07:40 – Updated: 2026-09-17 12:04
VLAI
EPSS
VEX
Title
netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
Summary
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
New test case fails unexpectedly when avx2 matching functions are used.
The test first loads a ranomly generated pipapo set
with 'ipv4 . port' key, i.e. nft -f foo.
This works. Then, it reloads the set after a flush:
(echo flush set t s; cat foo) | nft -f -
This is expected to work, because its the same set after all and it was
already loaded once.
But with avx2, this fails: nft reports a clashing element.
The reported clash is of following form:
We successfully re-inserted
a . b
c . d
Then we try to insert a . d
avx2 finds the already existing a . d, which (due to 'flush set') is marked
as invalid in the new generation. It skips the element and moves to next.
Due to incorrect masking, the skip-step finds the next matching
element *only considering the first field*,
i.e. we return the already reinserted "a . b", even though the
last field is different and the entry should not have been matched.
No such error is reported for the generic c implementation (no avx2) or when
the last field has to use the 'nft_pipapo_avx2_lookup_slow' fallback.
Bisection points to
7711f4bb4b36 ("netfilter: nft_set_pipapo: fix range overlap detection")
but that fix merely uncovers this bug.
Before this commit, the wrong element is returned, but erronously
reported as a full, identical duplicate.
The root-cause is too early return in the avx2 match functions.
When we process the last field, we should continue to process data
until the entire input size has been consumed to make sure no stale
bits remain in the map.
Severity
9.4 (Critical)
8.1 (High)
CWE
- CWE-480 - Use of Incorrect Operator
Assigner
References
26 references
Impacted products
20 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
7400b063969bdca4a06cd97f1294d765c8eecbe1 , < f8c39983fc9c1a978c82e6f2df7bfba8a8561587
(git)
Affected: 7400b063969bdca4a06cd97f1294d765c8eecbe1 , < c7babe2f28b507e17f28e9f753b7caec72d4857f (git) Affected: 7400b063969bdca4a06cd97f1294d765c8eecbe1 , < 1c43f0dd8691ddf8884793b481ddc7511cf593c3 (git) Affected: 7400b063969bdca4a06cd97f1294d765c8eecbe1 , < fa4f1f52528c73989d820f32bfca06bec5afeece (git) Affected: 7400b063969bdca4a06cd97f1294d765c8eecbe1 , < 3d53f9aafd469ae1ea27051e00f5b96ca1b55d52 (git) Affected: 7400b063969bdca4a06cd97f1294d765c8eecbe1 , < 07de44424bb7f17ef9357e8535df96d9e97c40cb (git) Affected: 7400b063969bdca4a06cd97f1294d765c8eecbe1 , < 0abbc43f71d99baadeeba6fa3fe1c80b676f57ed (git) Affected: 7400b063969bdca4a06cd97f1294d765c8eecbe1 , < d3c0037ffe1273fa1961e779ff6906234d6cf53c (git) |
|
| Linux | Linux |
Affected:
5.7
Unaffected: 0 , < 5.7 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.136 , ≤ 6.6.* (semver) Unaffected: 6.12.83 , ≤ 6.12.* (semver) Unaffected: 6.18.24 , ≤ 6.18.* (semver) Unaffected: 6.19.14 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10.2
|
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:6.12.0-55.103.1.el10_0 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:5.14.0-687.42.1.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:5.14.0-284.191.1.el9_2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2 |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:5.14.0-284.191.1.rt14.476.el9_2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2::nfv |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
cpe:/o:redhat:rhel_e4s:9.2
|
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:5.14.0-427.149.1.el9_4 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4 |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
cpe:/o:redhat:rhel_e4s:9.4
|
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:5.14.0-570.138.1.el9_6 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6 |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
cpe:/o:redhat:rhel_eus:9.6
|
|
| Red Hat | Red Hat OpenShift Container Platform 4.20 |
Unaffected:
4.20.9.6.202609092300-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.20::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.21 |
Unaffected:
4.21.9.6.202609090322-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.21::el9 |
|
| Red Hat | Red Hat OpenShift Container Platform 4.22 |
Unaffected:
4.22.9.8.202609020733-0 , < *
(rpm)
cpe:/a:redhat:openshift:4.22::el9 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
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"lang": "en",
"value": "RHSA-2026:65712: Red Hat Enterprise Linux AppStream E4S (v.9.4), Red Hat Enterprise Linux BaseOS E4S (v.9.4), Red Hat Enterprise Linux Real Time E4S (v.9.4), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.4)"
},
{
"lang": "en",
"value": "RHSA-2026:62568: Red Hat CodeReady Linux Builder EUS (v.9.6), Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat Enterprise Linux BaseOS EUS (v.9.6), Red Hat Enterprise Linux Real Time EUS (v.9.6), Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)"
},
{
"lang": "en",
"value": "RHSA-2026:59723: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9)"
},
{
"lang": "en",
"value": "RHSA-2026:62642: Red Hat Enterprise Linux BaseOS (v. 10)"
},
{
"lang": "en",
"value": "RHSA-2026:62638: Red Hat Enterprise Linux BaseOS E4S (v.9.2)"
},
{
"lang": "en",
"value": "RHSA-2026:62639: Red Hat Enterprise Linux BaseOS E4S (v.9.4)"
},
{
"lang": "en",
"value": "RHSA-2026:62641: Red Hat Enterprise Linux BaseOS EUS (v.9.6)"
},
{
"lang": "en",
"value": "RHSA-2026:62640: Red Hat Enterprise Linux BaseOS (v. 9)"
},
{
"lang": "en",
"value": "RHSA-2026:67721: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-05-06T00:00:00.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-05-06T00:00:00.000Z",
"value": "Made public."
}
],
"title": "kernel: netfilter: nft_set_pipapo_avx2: don\u0027t return non-matching entry on expiry",
"workarounds": [
{
"lang": "en",
"value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability."
}
],
"x_adpType": "supplier",
"x_generator": {
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}
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],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "7400b063969bdca4a06cd97f1294d765c8eecbe1",
"versionType": "git"
},
{
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"status": "affected",
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"versions": [
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},
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"status": "unaffected",
"version": "0",
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},
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"status": "unaffected",
"version": "5.10.258",
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},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.136",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.83",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.24",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.19.*",
"status": "unaffected",
"version": "6.19.14",
"versionType": "semver"
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{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
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"descriptions": [
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo_avx2: don\u0027t return non-matching entry on expiry\n\nNew test case fails unexpectedly when avx2 matching functions are used.\n\nThe test first loads a ranomly generated pipapo set\nwith \u0027ipv4 . port\u0027 key, i.e. nft -f foo.\n\nThis works. Then, it reloads the set after a flush:\n(echo flush set t s; cat foo) | nft -f -\n\nThis is expected to work, because its the same set after all and it was\nalready loaded once.\n\nBut with avx2, this fails: nft reports a clashing element.\n\nThe reported clash is of following form:\n\n We successfully re-inserted\n a . b\n c . d\n\nThen we try to insert a . d\n\navx2 finds the already existing a . d, which (due to \u0027flush set\u0027) is marked\nas invalid in the new generation. It skips the element and moves to next.\n\nDue to incorrect masking, the skip-step finds the next matching\nelement *only considering the first field*,\n\ni.e. we return the already reinserted \"a . b\", even though the\nlast field is different and the entry should not have been matched.\n\nNo such error is reported for the generic c implementation (no avx2) or when\nthe last field has to use the \u0027nft_pipapo_avx2_lookup_slow\u0027 fallback.\n\nBisection points to\n7711f4bb4b36 (\"netfilter: nft_set_pipapo: fix range overlap detection\")\nbut that fix merely uncovers this bug.\n\nBefore this commit, the wrong element is returned, but erronously\nreported as a full, identical duplicate.\n\nThe root-cause is too early return in the avx2 match functions.\nWhen we process the last field, we should continue to process data\nuntil the entire input size has been consumed to make sure no stale\nbits remain in the map."
}
],
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"baseScore": 9.4,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L",
"version": "3.1"
},
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"lang": "en",
"value": "AV:N - Although nftables configuration is local, the vulnerable AVX2 pipapo lookup is also used from nftables packet hooks, so a received network packet can exercise it in a deployed firewall ruleset.\nAC:L - No race, memory-layout dependency, or probabilistic condition is required once an affected AVX2 interval/concatenated set with expired or inactive entries exists; the attacker controls the packet key values used for lookup.\nPR:N - A remote packet sender does not need nftables privileges or authentication to trigger the packet-path lookup in an already configured firewall.\nUI:N - No victim user action is needed; packet processing and set lookup occur automatically in the kernel netfilter hook path.\nS:U - The impact remains within the kernel/network filtering security authority and does not cross a VM, IOMMU, or separate sandbox boundary.\nC:H - The bug can falsely match a non-matching set element after an expired or inactive element is skipped, which can bypass firewall policy and expose services or traffic that should have been unreachable.\nI:H - A false nftables set match can select the wrong verdict or map data, allowing unauthorized traffic/action contrary to the intended firewall policy.\nA:L - The same wrong-match behavior can cause legitimate nftables updates to fail with false element clashes or can misclassify selected traffic, but it is not a kernel crash, hang, or memory corruption."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-05T12:26:01.768Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
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"references": [
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"url": "https://git.kernel.org/stable/c/f8c39983fc9c1a978c82e6f2df7bfba8a8561587"
},
{
"url": "https://git.kernel.org/stable/c/c7babe2f28b507e17f28e9f753b7caec72d4857f"
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"url": "https://git.kernel.org/stable/c/3d53f9aafd469ae1ea27051e00f5b96ca1b55d52"
},
{
"url": "https://git.kernel.org/stable/c/07de44424bb7f17ef9357e8535df96d9e97c40cb"
},
{
"url": "https://git.kernel.org/stable/c/0abbc43f71d99baadeeba6fa3fe1c80b676f57ed"
},
{
"url": "https://git.kernel.org/stable/c/d3c0037ffe1273fa1961e779ff6906234d6cf53c"
}
],
"title": "netfilter: nft_set_pipapo_avx2: don\u0027t return non-matching entry on expiry",
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"cveId": "CVE-2026-43114",
"datePublished": "2026-05-06T07:40:39.877Z",
"dateReserved": "2026-05-01T14:12:55.986Z",
"dateUpdated": "2026-09-17T12:04:37.048Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
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Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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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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