CVE-2026-98622net/sched: act_ct: don't WARN on benign flow_offload_alloc() failure
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: net/sched: act_ct: don't WARN on benign flow_offload_alloc() failure flow_offload_alloc() returns NULL when the conntrack entry is dying (e.g. raced with a conntrack flush) or when the GFP_ATOMIC allocation fails; both are expected under load and neither is a kernel bug. This path runs from softirq on every committed packet, so with panic_on_warn=1 an unprivileged user can panic the box just by racing a conntrack flush against a `tc ... action ct commit` classifier. Reproduced with a custom repro under QEMU: a small, fixed set of UDP flows through `tc filter ... action ct commit` on lo, raced against threads flooding bare ctnetlink CT_DELETE (flush) requests. Hits WARNING: net/sched/act_ct.c:437 (tcf_ct_flow_table_add(), inlined into tcf_ct_act() in this build) within ~15s on the unpatched kernel; same setup is clean on the patched kernel. The fix itself is behavior-preserving: both branches already did `goto err_alloc` before and after, only the WARN is removed.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from 64ff70b80fd403110b67dd9f7184a604fdb0da43 before e8fcf3f08834e939b797311742ee72b1e2a08096; from 64ff70b80fd403110b67dd9f7184a604fdb0da43 before af475f599270e59313552e6c6f3af8507da672b8; from 64ff70b80fd403110b67dd9f7184a604fdb0da43 before 424ba52c0058deeb940d02cba52eb0aeb288db33; from 64ff70b80fd403110b67dd9f7184a604fdb0da43 before d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a; from 64ff70b80fd403110b67dd9f7184a604fdb0da43 before d805560ad69cb266d669341ca01e26bffb0d2c67; from 64ff70b80fd403110b67dd9f7184a604fdb0da43 before 00734f3684fcec42c319bedfe68a5d357c720b53; from 64ff70b80fd403110b67dd9f7184a604fdb0da43 before 650787233c2fd6e515a7c5f371019a9fa080ccd2; 64ff70b80fd403110b67dd9f7184a604fdb0da43 builds before 47abe7a5c4eb53269aca3506446f851572a059a3 | CNA record |
References
- https://git.kernel.org/stable/c/e8fcf3f08834e939b797311742ee72b1e2a08096
- https://git.kernel.org/stable/c/af475f599270e59313552e6c6f3af8507da672b8
- https://git.kernel.org/stable/c/424ba52c0058deeb940d02cba52eb0aeb288db33
- https://git.kernel.org/stable/c/d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a
- https://git.kernel.org/stable/c/d805560ad69cb266d669341ca01e26bffb0d2c67
- https://git.kernel.org/stable/c/00734f3684fcec42c319bedfe68a5d357c720b53
- https://git.kernel.org/stable/c/650787233c2fd6e515a7c5f371019a9fa080ccd2
- https://git.kernel.org/stable/c/47abe7a5c4eb53269aca3506446f851572a059a3
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.