{"id":"CVE-2026-98622","published":"2026-10-18T16:17:15.117","lastModified":"2026-10-19T10:19:26.330","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: act_ct: don't WARN on benign flow_offload_alloc() failure\n\nflow_offload_alloc() returns NULL when the conntrack entry is dying\n(e.g. raced with a conntrack flush) or when the GFP_ATOMIC allocation\nfails; both are expected under load and neither is a kernel bug. This\npath runs from softirq on every committed packet, so with\npanic_on_warn=1 an unprivileged user can panic the box just by racing\na conntrack flush against a `tc ... action ct commit` classifier.\n\nReproduced with a custom repro under QEMU: a small, fixed set of UDP\nflows through `tc filter ... action ct commit` on lo, raced against\nthreads flooding bare ctnetlink CT_DELETE (flush) requests. Hits\nWARNING: net/sched/act_ct.c:437 (tcf_ct_flow_table_add(), inlined\ninto tcf_ct_act() in this build) within ~15s on the unpatched kernel;\nsame setup is clean on the patched kernel. The fix itself is\nbehavior-preserving: both branches already did `goto err_alloc`\nbefore and after, only the WARN is removed.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/00734f3684fcec42c319bedfe68a5d357c720b53","tags":[]},{"url":"https://git.kernel.org/stable/c/424ba52c0058deeb940d02cba52eb0aeb288db33","tags":[]},{"url":"https://git.kernel.org/stable/c/47abe7a5c4eb53269aca3506446f851572a059a3","tags":[]},{"url":"https://git.kernel.org/stable/c/650787233c2fd6e515a7c5f371019a9fa080ccd2","tags":[]},{"url":"https://git.kernel.org/stable/c/af475f599270e59313552e6c6f3af8507da672b8","tags":[]},{"url":"https://git.kernel.org/stable/c/d512c484bd93a5f2794aa03c9faeb7bcb82dbd4a","tags":[]},{"url":"https://git.kernel.org/stable/c/d805560ad69cb266d669341ca01e26bffb0d2c67","tags":[]},{"url":"https://git.kernel.org/stable/c/e8fcf3f08834e939b797311742ee72b1e2a08096","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}