CVE-2026-43114
published 2026-05-06CVE-2026-43114: 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…
PriorityP350critical9.4CVSS 3.1
AVNACLPRNUINSUCHIHAL
EPSS
0.36%
27.9th percentile
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.
Affected
64 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < f8c39983fc9c1a978c82e6f2df7bfba8a8561587 | f8c39983fc9c1a978c82e6f2df7bfba8a8561587 |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < c7babe2f28b507e17f28e9f753b7caec72d4857f | c7babe2f28b507e17f28e9f753b7caec72d4857f |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < 1c43f0dd8691ddf8884793b481ddc7511cf593c3 | 1c43f0dd8691ddf8884793b481ddc7511cf593c3 |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < fa4f1f52528c73989d820f32bfca06bec5afeece | fa4f1f52528c73989d820f32bfca06bec5afeece |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < 3d53f9aafd469ae1ea27051e00f5b96ca1b55d52 | 3d53f9aafd469ae1ea27051e00f5b96ca1b55d52 |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < 07de44424bb7f17ef9357e8535df96d9e97c40cb | 07de44424bb7f17ef9357e8535df96d9e97c40cb |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < 0abbc43f71d99baadeeba6fa3fe1c80b676f57ed | 0abbc43f71d99baadeeba6fa3fe1c80b676f57ed |
| linux | linux | >= 7400b063969bdca4a06cd97f1294d765c8eecbe1 < d3c0037ffe1273fa1961e779ff6906234d6cf53c | d3c0037ffe1273fa1961e779ff6906234d6cf53c |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 5.7 < 6.6.136 | 6.6.136 |
| linux | linux_kernel | >= 6.13 < 6.18.24 | 6.18.24 |
| linux | linux_kernel | >= 6.19 < 6.19.14 | 6.19.14 |
| linux | linux_kernel | >= 6.7 < 6.12.83 | 6.12.83 |
| ubuntu | linux | — | — |
| ubuntu | linux-aws | — | — |
| ubuntu | linux-aws-5.15 | — | — |
| ubuntu | linux-aws-6.8 | — | — |
| ubuntu | linux-aws-fips | — | — |
| ubuntu | linux-azure | — | — |
CVSS provenance
nvdv3.19.4CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
vendor_ubuntu8.8HIGH
vendor_redhat5.5MEDIUM
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Red Hat
kernel: netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
vendor_redhat·2026-05-06·CVSS 5.5
CVE-2026-43114 [MEDIUM] CWE-480 kernel: netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
kernel: netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
A flaw was found in the Linux kernel's netfilter component. This vulnerability, located in the nft_set_pipapo_avx2 functionality, is caused by incorrect data processing during AVX2 matching operations. This can lead to the system incorrectly identifying or matching network data entries within netfilter sets. Such an issue could result in unexpected network filtering behavior or data integrity problems, potentially affecting the stability and correctness of network traffic management.
Package: kernel (Red Hat Enterprise Linux 10) - Fix deferred
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linu
VulDB
Linux Kernel up to 6.6.135/6.12.82/6.18.23/6.19.13 netfilter nft_set_pipapo_avx2 privilege escalation (WID-SEC-2026-1385)
vuldb·2026-06-09·CVSS 9.4
CVE-2026-43114 [CRITICAL] Linux Kernel up to 6.6.135/6.12.82/6.18.23/6.19.13 netfilter nft_set_pipapo_avx2 privilege escalation (WID-SEC-2026-1385)
A vulnerability labeled as problematic has been found in Linux Kernel up to 6.6.135/6.12.82/6.18.23/6.19.13. This affects the function nft_set_pipapo_avx2 of the component netfilter. The manipulation results in privilege escalation.
This vulnerability was named CVE-2026-43114. The attack needs to be approached within the local network. There is no available exploit.
The affected component should be upgraded.
GHSA
GHSA-6cwp-88hv-x237: In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
New te
ghsa_unreviewed·2026-05-06
CVE-2026-43114 GHSA-6cwp-88hv-x237: In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
New te
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 elemen
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/07de44424bb7f17ef9357e8535df96d9e97c40cbhttps://git.kernel.org/stable/c/0abbc43f71d99baadeeba6fa3fe1c80b676f57edhttps://git.kernel.org/stable/c/1c43f0dd8691ddf8884793b481ddc7511cf593c3https://git.kernel.org/stable/c/3d53f9aafd469ae1ea27051e00f5b96ca1b55d52https://git.kernel.org/stable/c/c7babe2f28b507e17f28e9f753b7caec72d4857fhttps://git.kernel.org/stable/c/d3c0037ffe1273fa1961e779ff6906234d6cf53chttps://git.kernel.org/stable/c/f8c39983fc9c1a978c82e6f2df7bfba8a8561587https://git.kernel.org/stable/c/fa4f1f52528c73989d820f32bfca06bec5afeecehttps://access.redhat.com/security/cve/CVE-2026-43114https://bugzilla.redhat.com/show_bug.cgi?id=2466994https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43114.json
2026-05-06
Published