[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2026-31586":6},{"stargazers_count":4,"fetched_at":5},7,"2026-07-30T21:17:53.703Z",{"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-2026-31586","In the Linux kernel, the following vulnerability has been resolved:  mm: blk-cgroup: fix use-after-free in cgwb_release_workfn()  cgwb_release_workfn() calls css_put(wb->blkcg_css) and then later accesses wb->blkcg_css again via blkcg_unpin_online().  If css_put() drops the last reference, the blkcg can be freed asynchronously (css_free_rwork_fn -> blkcg_css_free -> kfree) before blkcg_unpin_online() dereferences the pointer to access blkcg->online_pin, resulting in a use-after-free:    BUG: KASAN: slab-use-after-free in blkcg_unpin_online (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 block/blk-cgroup.c:1367)   Write of size 4 at addr ff11000117aa6160 by task kworker/71:1/531    Workqueue: cgwb_release cgwb_release_workfn    Call Trace:     \u003CTASK>      blkcg_unpin_online (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:400 ./include/linux/refcount.h:389 ./include/linux/refcount.h:432 ./include/linux/refcount.h:450 block/blk-cgroup.c:1367)      cgwb_release_workfn (mm/backing-dev.c:629)      process_scheduled_works (kernel/workqueue.c:3278 kernel/workqueue.c:3385)     Freed by task 1016:     kfree (./include/linux/kasan.h:235 mm/slub.c:2689 mm/slub.c:6246 mm/slub.c:6561)     css_free_rwork_fn (kernel/cgroup/cgroup.c:5542)     process_scheduled_works (kernel/workqueue.c:3302 kernel/workqueue.c:3385)  ** Stack based on commit 66672af7a095 (\"Add linux-next specific files for 20260410\")  I am seeing this crash sporadically in Meta fleet across multiple kernel versions.  A full reproducer is available at: https://github.com/leitao/debug/blob/main/reproducers/repro_blkcg_uaf.sh  (The race window is narrow.  To make it easily reproducible, inject a msleep(100) between css_put() and blkcg_unpin_online() in cgwb_release_workfn().  With that delay and a KASAN-enabled kernel, the reproducer triggers the splat reliably in less than a second.)  Fix this by moving blkcg_unpin_online() before css_put(), so the cgwb's CSS reference keeps the blkcg alive while blkcg_unpin_online() accesses it.",null,[],[],[],[14],{"_key":15},"CVE-2026-31586",[],[],[],"2026-04-24T15:16:33.393Z","2026-07-05T20:00:27.941063067Z",{"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-2026-31586",[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,[40,66],{"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",[46,50,51,52,53,57,60,63],{"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":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":54,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":55,"version_end_type":56,"fixed_in":9},"lt5_10_259_1","5.10.259-1","excluding",{"version":58,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":59,"version_end_type":56,"fixed_in":9},"lt6_1_176_1","6.1.176-1",{"version":61,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":62,"version_end_type":56,"fixed_in":9},"lt6_12_85_1","6.12.85-1",{"version":64,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":65,"version_end_type":56,"fixed_in":9},"lt6_19_14_1","6.19.14-1",{"ecosystem":41,"name":67,"vendor":43,"product":67,"cpe_part":9,"purl_type":44,"purl_namespace":43,"purl_name":67,"source":9,"versions":68},"linux-6.1",[69],{"version":70,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":71,"version_end_type":56,"fixed_in":9},"lt6_1_176_1~deb11u1","6.1.176-1~deb11u1"]