CVE-2022-48809 (GCVE-0-2022-48809)
Vulnerability from cvelistv5
Published
2024-07-16 11:43
Modified
2025-05-04 08:23
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314 Patch
Impacted products
Vendor Product Version
Linux Linux Version: fc4099f17240767554ff3a73977acb78ef615404
Version: fc4099f17240767554ff3a73977acb78ef615404
Version: fc4099f17240767554ff3a73977acb78ef615404
Version: fc4099f17240767554ff3a73977acb78ef615404
Version: fc4099f17240767554ff3a73977acb78ef615404
Version: fc4099f17240767554ff3a73977acb78ef615404
Version: fc4099f17240767554ff3a73977acb78ef615404
Version: fc4099f17240767554ff3a73977acb78ef615404
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-48809\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-07-16T12:15:05.190\",\"lastModified\":\"2024-11-21T07:34:07.787\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"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 1.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: soluciona un memleak al desaclonar un skb dst y sus metadatos Al desaclonar un skb dst y sus metadatos asociados, se asigna un nuevo dst+metadatos que luego reemplaza al antiguo en el skb. Esto es \u00fatil para tener metadatos dst+ no compartidos adjuntos a un skb espec\u00edfico. El problema es que los metadatos dst+ no clonados se inicializan con un recuento de 1, que se incrementa a 2 antes de adjuntarlo al skb. Cuando tun_dst_unclone regresa, solo se hace referencia a los metadatos dst+ desde un \u00fanico lugar (el skb) mientras su refcount es 2. Su refcount nunca bajar\u00e1 a 0 (cuando se consume el skb), lo que provoca una p\u00e9rdida de memoria. Solucione este problema eliminando la llamada a dst_hold en tun_dst_unclone, ya que el recuento de metadatos dst+ ya es 1.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.3\",\"versionEndExcluding\":\"4.9.302\",\"matchCriteriaId\":\"72C5D0FA-1645-4649-A21B-6D40B49AA943\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.10\",\"versionEndExcluding\":\"4.14.267\",\"matchCriteriaId\":\"FD3CEBEB-60B8-4EA2-B346-6ADF49F754D9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.15\",\"versionEndExcluding\":\"4.19.230\",\"matchCriteriaId\":\"62845903-4271-4AFA-B8B7-6517ED5BFEB2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.180\",\"matchCriteriaId\":\"6808B38F-AD73-4D55-A158-6EF605E8EB66\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.101\",\"matchCriteriaId\":\"A154171E-A3B9-42BE-9E97-C9B0EA43FC54\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.24\",\"matchCriteriaId\":\"866451F0-299E-416C-B0B8-AE6B33E62CCA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.10\",\"matchCriteriaId\":\"679523BA-1392-404B-AB85-F5A5408B1ECC\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]}]}}",
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  }
}


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