{"id":"DEBIAN-CVE-2026-98588","details":"In the Linux kernel, the following vulnerability has been resolved:  bpf, sockmap: Reject max_entries \u003e INT_MAX in sock_map_alloc  sock_map_alloc() only rejects max_entries == 0 and otherwise allows any u32 value.  sock_map_free() then walks the sks[] array with a signed int iterator:  \tint i; \tfor (i = 0; i \u003c stab-\u003emap.max_entries; i++) \t\tstruct sock **psk = &stab-\u003esks[i];  When a SOCKMAP is created with max_entries = 0xffffffff (UINT_MAX), the allocation of 32 GiB can succeed on large-memory hosts.  During free the counter reaches 0x80000000, wraps to INT_MIN, is sign-extended by movslq and turned into a ~16 GiB negative offset from stab-\u003esks, pointing far below the allocation.  The faulting access is an xchg() write in sock_map_free().  Without KASAN, the same out-of-bounds write can fault on an unmapped vmalloc page or corrupt an unrelated allocation if that vmalloc address is populated. On a KASAN kernel with CONFIG_KASAN_VMALLOC=y, the shadow check for that address hits an unmapped shadow page and oopses first:    BUG: unable to handle page fault for address: fffff521b59c5a00   RIP: 0010:kasan_check_range+0x107/0x190   Call Trace:    sock_map_free+0x93/0x190    map_create+0x68d/0xb30    __sys_bpf+0x21e/0x2e70  Vmcore confirmed stab-\u003emap.max_entries == 0xffffffff, stab-\u003esks == 0xffffc911ace2d000, and the faulting address sks + (s64)INT_MIN * 8 exactly at 0xffffc90dace2d000.  The same buggy path is reached on the normal close()/bpf_map_free_deferred() path whenever such a map is destroyed.  sock_map_alloc() used to bound its allocation size through bpf_map_charge_init(), but the bound was dropped when rlimit-based memory accounting was removed.  Reject max_entries \u003e INT_MAX at creation time so the signed iterator in sock_map_free() never sees a value that would overflow.  Triggered by syzkaller and reproduced on both a 6.6-based KASAN kernel and the upstream v7.3-rc2 kernel.","modified":"2026-10-19T05:00:28.617653766Z","published":"2026-10-18T17:47:37.501777548Z","upstream":["CVE-2026-98588"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-98588"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.190-1"}]}],"versions":["6.1.106-1","6.1.106-2","6.1.106-3","6.1.112-1","6.1.115-1","6.1.119-1","6.1.123-1","6.1.124-1","6.1.128-1","6.1.129-1","6.1.133-1","6.1.135-1","6.1.137-1","6.1.139-1","6.1.140-1","6.1.147-1","6.1.148-1","6.1.153-1","6.1.158-1","6.1.159-1","6.1.162-1","6.1.164-1","6.1.170-1","6.1.170-2","6.1.170-3","6.1.172-1","6.1.174-1","6.1.176-1","6.1.177-1","6.1.180-1","6.1.187-1","6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1","6.1.64-1","6.1.66-1","6.1.67-1","6.1.69-1","6.1.69-1~bpo11+1","6.1.76-1","6.1.76-1~bpo11+1","6.1.82-1","6.1.85-1","6.1.90-1","6.1.90-1~bpo11+1","6.1.94-1","6.1.94-1~bpo11+1","6.1.98-1","6.1.99-1"],"ecosystem_specific":{"urgency":"not 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