{"id":"CVE-2022-48809","state":"PUBLISHED","title":"net: fix a memleak when uncloning an skb dst and its metadata","description":"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.","publishedAt":"2024-07-16T11:43:59.757Z","updatedAt":"2026-05-11T18:47:33.230Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"4ac84498fbe84a00e7aef185e2bb3e40ce71eca4","versionType":"git"},{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"c1ff27d100e2670b03cbfddb9117e5f9fc672540","versionType":"git"},{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"0be943916d781df2b652793bb2d3ae4f9624c10a","versionType":"git"},{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88","versionType":"git"},{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1","versionType":"git"},{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"fdcb263fa5cda15b8cb24a641fa2718c47605314","versionType":"git"},{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"8b1087b998e273f07be13dcb5f3ca4c309c7f108","versionType":"git"},{"version":"fc4099f17240767554ff3a73977acb78ef615404","status":"affected","lessThan":"9eeabdf17fa0ab75381045c867c370f4cc75a613","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/dst_metadata.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.3","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.3","versionType":"semver"},{"version":"4.9.302","status":"unaffected","lessThanOrEqual":"4.9.*","versionType":"semver"},{"version":"4.14.267","status":"unaffected","lessThanOrEqual":"4.14.*","versionType":"semver"},{"version":"4.19.230","status":"unaffected","lessThanOrEqual":"4.19.*","versionType":"semver"},{"version":"5.4.180","status":"unaffected","lessThanOrEqual":"5.4.*","versionType":"semver"},{"version":"5.10.101","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.24","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"5.16.10","status":"unaffected","lessThanOrEqual":"5.16.*","versionType":"semver"},{"version":"5.17","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/net/dst_metadata.h"]}],"references":["https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4","https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540","https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a","https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88","https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1","https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314","https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108","https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613"],"weaknesses":[],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/48xxx/CVE-2022-48809.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-48809","state":"PUBLISHED","datePublished":"2024-07-16T11:43:59.757Z","dateUpdated":"2026-05-11T18:47:33.230Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2024-07-16T11:38:08.897Z"},"containers":{"cna":{"title":"net: fix a memleak when uncloning an skb dst and its metadata","descriptions":[{"lang":"en","value":"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 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