{"id":"CVE-2023-53186","revision":"0f75ac1a2ae64e68b325b188885b09b5","records":[{"revision":"0f75ac1a2ae64e68b325b188885b09b5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2023-53186","aliases":[],"title":"skbuff: Fix a race between coalescing and releasing SKBs","description":"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 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","state":0,"publishedAt":"2025-09-15T14:04:38.954+00:00","modifiedAt":"2026-10-15T21:41:27.688+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/skbuff.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"53e0961da1c7bbdabd1abebb20de403ec237ec09\",\n                            \"lessThan\": \"906a6689bb0191ad2a44131a3377006aa098af59\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"53e0961da1c7bbdabd1abebb20de403ec237ec09\",\n                            \"lessThan\": \"71850b5af92da21b4862a9bc55bda61091247d00\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"53e0961da1c7bbdabd1abebb20de403ec237ec09\",\n                            \"lessThan\": \"5f692c992a3bb9a8018e3488098b401a4229e7ec\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"53e0961da1c7bbdabd1abebb20de403ec237ec09\",\n                            \"lessThan\": \"0646dc31ca886693274df5749cd0c8c1eaaeb5ca\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/core/skbuff.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"5.15\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.15\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.108\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.25\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.2.12\",\n                            \"lessThanOrEqual\": \"6.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.1,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/906a6689bb0191ad2a44131a3377006aa098af59","https://git.kernel.org/stable/c/71850b5af92da21b4862a9bc55bda61091247d00","https://git.kernel.org/stable/c/5f692c992a3bb9a8018e3488098b401a4229e7ec","https://git.kernel.org/stable/c/0646dc31ca886693274df5749cd0c8c1eaaeb5ca"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2023-53186","license":"CVE Program Terms of Use","key":"cve-program:CVE-2023-53186","identifiers":["CVE-2023-53186"]},"retained":false,"historicalAffected":[]}],"coverage":[]}