[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2026-53264":6},{"stargazers_count":4,"fetched_at":5},8,"2026-09-19T04:32:17.889Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":17,"related":18,"reserved_at":9,"published_at":19,"modified_at":20,"state":9,"summary":21,"references_raw":23,"kevs":30,"epss":9,"epss_history":31,"metrics":32,"affected":39},"DEBIAN-CVE-2026-53264","In the Linux kernel, the following vulnerability has been resolved:  net/sched: act_api: use RCU with deferred freeing for action lifecycle  When NEWTFILTER and DELFILTER are run concurrently it is possible to create a race with an associated action.  Let's illustrate with CPU0 running NEWTFILTER and CPU1 running DELFILTER:   0: mutex_lock() \u003C-- holds the idr lock  0: rcu_read_lock()  0: p = idr_find(idr, index) \u003C-- action p is valid (RCU protects IDR)  0: mutex_unlock() \u003C-- releases the idr lock  1: refcount_dec_and_mutex_lock() \u003C-- refcnt 1->0, mutex held  1: idr_remove(idr, index) \u003C-- Action removed from IDR  1: mutex_unlock() \u003C-- mutex released allowing us to delete the action  1: tcf_action_cleanup(p); kfree(p) \u003C-- Kfrees p immediately, no deferral  0: refcount_inc_not_zero(&p->tcfa_refcnt) \u003C-- ouch, UAF p points to freed memory  This patch fixes the race condition between NEWTFILTER and DELFILTER by adding struct rcu_head to tc_action used in the deferral and introducing a call_rcu() in the delete path to defer the final kfree().  Note: this is a revert of commit d7fb60b9cafb (\"net_sched: get rid of tcfa_rcu\") but also modernization/simplification to directly use kfree_rcu().  Let's illustrate the new restored code path:   0: rcu_read_lock()  1: refcount_dec_and_mutex_lock() \u003C-- refcnt 1->0, mutex held  1: idr_remove(idr, index)  1: mutex_unlock()  1: call_rcu(&p->tcfa_rcu, tcf_action_rcu_free) \u003C-- defer kfree after grace period  0: p = idr_find(idr, index)  0: refcount_inc_not_zero(&p->tcfa_refcnt) \u003C-- fails, refcnt already 0  1: rcu_read_unlock() \u003C-- release so freeing can run after grace period  After CPU1 calls idr_remove(), the object is no longer reachable through the IDR. CPU0's subsequent idr_find() will return NULL, and even if it still held a stale pointer, the immediate kfree() is now deferred until after the RCU grace period, so no UAF can occur.",null,[],[],[],[14],{"_key":15},"CVE-2026-53264",[],[],[],"2026-06-25T09:16:44.400Z","2026-07-05T20:01:21.658550073Z",{"cisa_kev":22,"cisa_ransomware":22,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[24],{"url":25,"sources":26,"tags":28},"https://security-tracker.debian.org/tracker/CVE-2026-53264",[27],"osv_debian",[29],"Advisory",[],[],[33],{"source":27,"cvss_v2_0":9,"cvss_v3_0":9,"cvss_v3_1":34,"cvss_v4_0":9},{"baseScore":35,"baseSeverity":9,"vectorString":36,"impactScore":37,"exploitabilityScore":38},7.8,"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",9.8,4.6,[40,65],{"ecosystem":41,"name":42,"vendor":43,"product":42,"cpe_part":9,"purl_type":44,"purl_namespace":43,"purl_name":42,"source":9,"versions":45},"Debian","linux","debian","deb",[46,50,51,52,56,59,62],{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":9,"version_end_type":9,"fixed_in":9},"all",true,"ecosystem",{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":9,"version_end_type":9,"fixed_in":9},{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":9,"version_end_type":9,"fixed_in":9},{"version":53,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":55,"fixed_in":9},"lt5_10_259_1","5.10.259-1","excluding",{"version":57,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":58,"version_end_type":55,"fixed_in":9},"lt6_1_176_1","6.1.176-1",{"version":60,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":61,"version_end_type":55,"fixed_in":9},"lt6_12_94_1","6.12.94-1",{"version":63,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":64,"version_end_type":55,"fixed_in":9},"lt7_0_13_1","7.0.13-1",{"ecosystem":41,"name":66,"vendor":43,"product":66,"cpe_part":9,"purl_type":44,"purl_namespace":43,"purl_name":66,"source":9,"versions":67},"linux-6.1",[68],{"version":69,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":70,"version_end_type":55,"fixed_in":9},"lt6_1_176_1~deb11u1","6.1.176-1~deb11u1"]