{"id":"CVE-2023-53186","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nskbuff: Fix a race between coalescing and releasing SKBs\n\nCommit 1effe8ca4e34 (\"skbuff: fix coalescing for page_pool fragment\nrecycling\") allowed coalescing to proceed …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nskbuff: Fix a race between coalescing and releasing SKBs\n\nCommit 1effe8ca4e34 (\"skbuff: fix coalescing for page_pool fragment\nrecycling\") allowed coalescing to proceed …","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.15, < 5.15.108","linux_kernel >= 5.16, < 6.1.25","linux_kernel >= 6.2, < 6.2.12","linux_kernel = 6.3"],"patched":["linux_kernel 6.2.12"],"published":"2025-09-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:39.067","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53186","references":[{"url":"https://git.kernel.org/stable/c/0646dc31ca886693274df5749cd0c8c1eaaeb5ca","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5f692c992a3bb9a8018e3488098b401a4229e7ec","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/71850b5af92da21b4862a9bc55bda61091247d00","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/906a6689bb0191ad2a44131a3377006aa098af59","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00267,"epssPercentile":0.18752,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-15T21:34:19.294430Z"},"ingestedAt":"2026-10-15T22:48:25.400Z","slug":"CVE-2023-53186","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nskbuff: Fix a race between coalescing and releasing SKBs\n\nCommit 1effe8ca4e34 (\"skbuff: fix coalescing for page_pool fragment\nrecycling\") allowed coalescing to proceed with non page pool page and page\npool page when @from is cloned, i.e.\n\nto->pp_recycle    --> false\nfrom->pp_recycle  --> true\nskb_cloned(from)  --> true\n\nHowever, it actually requires skb_cloned(@from) to hold true until\ncoalescing finishes in this situation. If the other cloned SKB is\nreleased while the merging is in process, from_shinfo->nr_frags will be\nset to 0 toward the end of the function, causing the increment of frag\npage _refcount to be unexpectedly skipped resulting in inconsistent\nreference counts. Later when SKB(@to) is released, it frees the page\ndirectly even though the page pool page is still in use, leading to\nuse-after-free or double-free errors. So it should be prohibited.\n\nThe double-free error message below prompted us to investigate:\nBUG: Bad page state in process swapper/1  pfn:0e0d1\npage:00000000c6548b28 refcount:-1 mapcount:0 mapping:0000000000000000\nindex:0x2 pfn:0xe0d1\nflags: 0xfffffc0000000(node=0|zone=1|lastcpupid=0x1fffff)\nraw: 000fffffc0000000 0000000000000000 ffffffff00000101 0000000000000000\nraw: 0000000000000002 0000000000000000 ffffffffffffffff 0000000000000000\npage dumped because: nonzero _refcount\n\nCPU: 1 PID: 0 Comm: swapper/1 Tainted: G            E      6.2.0+\nCall Trace:\n <IRQ>\ndump_stack_lvl+0x32/0x50\nbad_page+0x69/0xf0\nfree_pcp_prepare+0x260/0x2f0\nfree_unref_page+0x20/0x1c0\nskb_release_data+0x10b/0x1a0\nnapi_consume_skb+0x56/0x150\nnet_rx_action+0xf0/0x350\n? __napi_schedule+0x79/0x90\n__do_softirq+0xc8/0x2b1\n__irq_exit_rcu+0xb9/0xf0\ncommon_interrupt+0x82/0xa0\n</IRQ>\n<TASK>\nasm_common_interrupt+0x22/0x40\nRIP: 0010:default_idle+0xb/0x20\n\n## Affected\n\n- `linux_kernel >= 5.15, < 5.15.108`\n- `linux_kernel >= 5.16, < 6.1.25`\n- `linux_kernel >= 6.2, < 6.2.12`\n- `linux_kernel = 6.3`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.2.12`","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}