{"id":"CVE-2022-48809","summary":"net: fix a memleak when uncloning an skb dst and its metadata","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix a memleak when uncloning an skb dst and its metadata\n\nWhen uncloning an skb dst and its associated metadata, a new\ndst+metadata is allocated and later replaces the old one in the skb.\nThis is helpful to have a non-shared dst+metadata attached to a specific\nskb.\n\nThe issue is the uncloned dst+metadata is initialized with a refcount of\n1, which is increased to 2 before attaching it to the skb. When\ntun_dst_unclone returns, the dst+metadata is only referenced from a\nsingle place (the skb) while its refcount is 2. Its refcount will never\ndrop to 0 (when the skb is consumed), leading to a memory leak.\n\nFix this by removing the call to dst_hold in tun_dst_unclone, as the\ndst+metadata refcount is already 1.","modified":"2026-07-11T03:55:42.438513133Z","published":"2024-07-16T11:43:59.757Z","related":["SUSE-SU-2024:2894-1","SUSE-SU-2024:2939-1","SUSE-SU-2024:2947-1","SUSE-SU-2024:4100-1","SUSE-SU-2025:0034-1"],"database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48809.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/48xxx/CVE-2022-48809.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-48809"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"fc4099f17240767554ff3a73977acb78ef615404"},{"fixed":"4ac84498fbe84a00e7aef185e2bb3e40ce71eca4"},{"fixed":"c1ff27d100e2670b03cbfddb9117e5f9fc672540"},{"fixed":"0be943916d781df2b652793bb2d3ae4f9624c10a"},{"fixed":"a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88"},{"fixed":"00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1"},{"fixed":"fdcb263fa5cda15b8cb24a641fa2718c47605314"},{"fixed":"8b1087b998e273f07be13dcb5f3ca4c309c7f108"},{"fixed":"9eeabdf17fa0ab75381045c867c370f4cc75a613"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48809.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.3.0"},{"fixed":"4.9.302"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.10.0"},{"fixed":"4.14.267"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.230"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.180"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.24"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"5.16.10"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-48809.json"}}],"schema_version":"1.7.5"}