5.5

CVE-2026-23399: nf_tables: nft_dynset: fix possible stateful expression memleak in error path

Modified
AliasesUBUNTU-CVE-2026-23399DEBIAN-CVE-2026-23399
Published 28-03-2026Last modified 15-10-2026

Vulnerability summary

CVE-2026-23399 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.13%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 29 · Related 29
SUSE-SU-2026:21834-1SUSE-SU-2026:2238-1USN-8567-1USN-8574-1USN-8574-2USN-8574-3

Timeline

  1. 28-03-2026
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: nf_tables: nft_dynset: fix possible stateful expression memleak in error path If cloning the second stateful expression in the element via GFP_ATOMIC fails, then the first stateful expression remains in place without being released.   unreferenced object (percpu) 0x607b97e9cab8 (size 16):     comm "softirq", pid 0, jiffies 4294931867     hex dump (first 16 bytes on cpu 3):       00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00     backtrace (crc 0):       pcpu_alloc_noprof+0x453/0xd80       nft_counter_clone+0x9c/0x190 [nf_tables]       nft_expr_clone+0x8f/0x1b0 [nf_tables]       nft_dynset_new+0x2cb/0x5f0 [nf_tables]       nft_rhash_update+0x236/0x11c0 [nf_tables]       nft_dynset_eval+0x11f/0x670 [nf_tables]       nft_do_chain+0x253/0x1700 [nf_tables]       nft_do_chain_ipv4+0x18d/0x270 [nf_tables]       nf_hook_slow+0xaa/0x1e0       ip_local_deliver+0x209/0x330

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

3%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 0.12% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu145 products
  • linux< 5.15.0-186.196 | < 6.8.0-136.136 | All versions (No fix recorded)
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1112.119 | < 6.8.0-1061.64 | All versions (No fix recorded)
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 563125a73ac30d7036ae69ca35c40500562c1de4, < eb7bf413e59945df03d4567b73ce464eebe2f4ea | ≥ 563125a73ac30d7036ae69ca35c40500562c1de4, < 4357dbb1d9c35ca0b4443d71c98a48e6666f7689 | ≥ 563125a73ac30d7036ae69ca35c40500562c1de4, < e6661add2d9c6913e1dad97336595e23a2bed195 | ≥ 563125a73ac30d7036ae69ca35c40500562c1de4, < d1354873cbe3b344899c4311ac05897fd83e3f21 | ≥ 563125a73ac30d7036ae69ca35c40500562c1de4, < 31641c682db73353e4647e40735c7f2a75ff58ef | ≥ 563125a73ac30d7036ae69ca35c40500562c1de4, < c88a9fd26cee365bec932196f76175772a941cca | ≥ 563125a73ac30d7036ae69ca35c40500562c1de4, < 0548a13b5a145b16e4da0628b5936baf35f51b43 | 5.11
  • linux_kernelEOL≥ 5.11.1, < 6.12.78 | ≥ 6.13, < 6.18.20 | ≥ 6.19, < 6.19.10 | 5.11 | 7.0:rc1 | 7.0:rc2 | 7.0:rc3 | 7.0:rc4 | 7.0:rc5 | 7.0:rc6 | 7.0:rc7
Debian1 product
  • linux< 6.1.176-1 | < 6.12.85-1 | < 6.19.10-1

3 vendors · 148 products

References

42 links
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