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vuln-cve/data/2026/22xxx/CVE-2026-22979.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-22979",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-01-13T15:37:45.936Z",
"datePublished": "2026-01-23T15:24:01.340Z",
"dateUpdated": "2026-11-10T12:41:02.757Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-05-23T16:03:37.832Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix memory leak in skb_segment_list for GRO packets\n\nWhen skb_segment_list() is called during packet forwarding, it handles\npackets that were aggregated by the GRO engine.\n\nHistorically, the segmentation logic in skb_segment_list assumes that\nindividual segments are split from a parent SKB and may need to carry\ntheir own socket memory accounting. Accordingly, the code transfers\ntruesize from the parent to the newly created segments.\n\nPrior to commit ed4cccef64c1 (\"gro: fix ownership transfer\"), this\ntruesize subtraction in skb_segment_list() was valid because fragments\nstill carry a reference to the original socket.\n\nHowever, commit ed4cccef64c1 (\"gro: fix ownership transfer\") changed\nthis behavior by ensuring that fraglist entries are explicitly\norphaned (skb->sk = NULL) to prevent illegal orphaning later in the\nstack. This change meant that the entire socket memory charge remained\nwith the head SKB, but the corresponding accounting logic in\nskb_segment_list() was never updated.\n\nAs a result, the current code unconditionally adds each fragment's\ntruesize to delta_truesize and subtracts it from the parent SKB. Since\nthe fragments are no longer charged to the socket, this subtraction\nresults in an effective under-count of memory when the head is freed.\nThis causes sk_wmem_alloc to remain non-zero, preventing socket\ndestruction and leading to a persistent memory leak.\n\nThe leak can be observed via KMEMLEAK when tearing down the networking\nenvironment:\n\nunreferenced object 0xffff8881e6eb9100 (size 2048):\n comm \"ping\", pid 6720, jiffies 4295492526\n backtrace:\n kmem_cache_alloc_noprof+0x5c6/0x800\n sk_prot_alloc+0x5b/0x220\n sk_alloc+0x35/0xa00\n inet6_create.part.0+0x303/0x10d0\n __sock_create+0x248/0x640\n __sys_socket+0x11b/0x1d0\n\nSince skb_segment_list() is exclusively used for SKB_GSO_FRAGLIST\npackets constructed by GRO, the truesize adjustment is removed.\n\nThe call to skb_release_head_state() must be preserved. As documented in\ncommit cf673ed0e057 (\"net: fix fraglist segmentation reference count\nleak\"), it is still required to correctly drop references to SKB\nextensions that may be overwritten during __copy_skb_header()."
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/core/skbuff.c"
],
"versions": [
{
"version": "2eeab8c47c3c0276e0746bc382f405c9a236a5ad",
"lessThan": "0b27828ebd1ed3107d7929c3737adbe862e99e74",
"status": "affected",
"versionType": "git"
},
{
"version": "fc126c1d51e9552eacd2d717b9ffe9262a8a4cd6",
"lessThan": "88bea149db2057112af3aaf63534b24fab5858ab",
"status": "affected",
"versionType": "git"
},
{
"version": "ed4cccef64c1d0d5b91e69f7a8a6697c3a865486",
"lessThan": "3264881431e308b9c72cb8a0159d57a56d67dd79",
"status": "affected",
"versionType": "git"
},
{
"version": "ed4cccef64c1d0d5b91e69f7a8a6697c3a865486",
"lessThan": "c114a32a2e70b82d447f409f7ffcfa3058f9d5bd",
"status": "affected",
"versionType": "git"
},
{
"version": "ed4cccef64c1d0d5b91e69f7a8a6697c3a865486",
"lessThan": "238e03d0466239410b72294b79494e43d4fabe77",
"status": "affected",
"versionType": "git"
},
{
"version": "d225b0ac96dc40d7e8ae2bc227eb2c56e130975f",
"status": "affected",
"versionType": "git"
},
{
"version": "5b3b67f731296027cceb3efad881ae281213f86f",
"status": "affected",
"versionType": "git"
},
{
"version": "6.1.85",
"lessThan": "6.1.161",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.6.26",
"lessThan": "6.6.121",
"status": "affected",
"versionType": "semver"
},
{
"version": "5.15.154",
"lessThan": "5.16",
"status": "affected",
"versionType": "semver"
},
{
"version": "6.8.5",
"lessThan": "6.9",
"status": "affected",
"versionType": "semver"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/core/skbuff.c"
],
"versions": [
{
"version": "6.9",
"status": "affected"
},
{
"version": "0",
"lessThan": "6.9",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.161",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.121",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.66",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.6",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.19",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.1.85",
"versionEndExcluding": "6.1.161"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.6.26",
"versionEndExcluding": "6.6.121"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.9",
"versionEndExcluding": "6.12.66"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.9",
"versionEndExcluding": "6.18.6"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.9",
"versionEndExcluding": "6.19"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.15.154"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "6.8.5"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/0b27828ebd1ed3107d7929c3737adbe862e99e74"
},
{
"url": "https://git.kernel.org/stable/c/88bea149db2057112af3aaf63534b24fab5858ab"
},
{
"url": "https://git.kernel.org/stable/c/3264881431e308b9c72cb8a0159d57a56d67dd79"
},
{
"url": "https://git.kernel.org/stable/c/c114a32a2e70b82d447f409f7ffcfa3058f9d5bd"
},
{
"url": "https://git.kernel.org/stable/c/238e03d0466239410b72294b79494e43d4fabe77"
}
],
"title": "net: fix memory leak in skb_segment_list for GRO packets",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"x_adpType": "supplier",
"providerMetadata": {
"orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"shortName": "siemens-SADP",
"dateUpdated": "2026-11-10T12:41:02.757Z"
},
"affected": [
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
"versions": [
{
"status": "affected",
"version": "V3.1.6",
"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AB0)",
"versions": [
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"lessThan": "*",
"versionType": "custom"
}
],
"defaultStatus": "unknown"
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{
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"product": "SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (6ES7518-4AX00-1AC0)",
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"lessThan": "*",
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}
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{
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"lessThan": "*",
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],
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},
{
"vendor": "Siemens",
"product": "SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP (6ES7518-4FX00-1AB0)",
"versions": [
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{
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"lessThan": "*",
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}
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{
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"lessThan": "*",
"versionType": "custom"
}
],
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{
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}
]
},
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-22979",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"version": "2.0.3",
"timestamp": "2026-11-05T21:17:36.655689Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-11-05T21:23:13.501Z"
}
}
]
}
}
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