CVE-2024-57982 (GCVE-0-2024-57982)
Vulnerability from cvelistv5
Published
2025-02-27 02:07
Modified
2025-05-04 10:07
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: xfrm: state: fix out-of-bounds read during lookup lookup and resize can run in parallel. The xfrm_state_hash_generation seqlock ensures a retry, but the hash functions can observe a hmask value that is too large for the new hlist array. rehash does: rcu_assign_pointer(net->xfrm.state_bydst, ndst) [..] net->xfrm.state_hmask = nhashmask; While state lookup does: h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family); hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) { This is only safe in case the update to state_bydst is larger than net->xfrm.xfrm_state_hmask (or if the lookup function gets serialized via state spinlock again). Fix this by prefetching state_hmask and the associated pointers. The xfrm_state_hash_generation seqlock retry will ensure that the pointer and the hmask will be consistent. The existing helpers, like xfrm_dst_hash(), are now unsafe for RCU side, add lockdep assertions to document that they are only safe for insert side. xfrm_state_lookup_byaddr() uses the spinlock rather than RCU. AFAICS this is an oversight from back when state lookup was converted to RCU, this lock should be replaced with RCU in a future patch.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a16871c7832ea6435abb6e0b58289ae7dcb7e4fcPatch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dd4c2a174994238d55ab54da2545543d36f4e0d0Patch, Mailing List
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e952837f3ddb0ff726d5b582aa1aad9aa38d024dPatch, Mailing List
Impacted products
Vendor Product Version
Linux Linux Version: c2f672fc94642bae96821a393f342edcfa9794a6
Version: c2f672fc94642bae96821a393f342edcfa9794a6
Version: c2f672fc94642bae96821a393f342edcfa9794a6
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   Linux Linux Version: 4.9
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/xfrm/xfrm_state.c"
          ],
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          "vendor": "Linux",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: state: fix out-of-bounds read during lookup\n\nlookup and resize can run in parallel.\n\nThe xfrm_state_hash_generation seqlock ensures a retry, but the hash\nfunctions can observe a hmask value that is too large for the new hlist\narray.\n\nrehash does:\n  rcu_assign_pointer(net-\u003exfrm.state_bydst, ndst) [..]\n  net-\u003exfrm.state_hmask = nhashmask;\n\nWhile state lookup does:\n  h = xfrm_dst_hash(net, daddr, saddr, tmpl-\u003ereqid, encap_family);\n  hlist_for_each_entry_rcu(x, net-\u003exfrm.state_bydst + h, bydst) {\n\nThis is only safe in case the update to state_bydst is larger than\nnet-\u003exfrm.xfrm_state_hmask (or if the lookup function gets\nserialized via state spinlock again).\n\nFix this by prefetching state_hmask and the associated pointers.\nThe xfrm_state_hash_generation seqlock retry will ensure that the pointer\nand the hmask will be consistent.\n\nThe existing helpers, like xfrm_dst_hash(), are now unsafe for RCU side,\nadd lockdep assertions to document that they are only safe for insert\nside.\n\nxfrm_state_lookup_byaddr() uses the spinlock rather than RCU.\nAFAICS this is an oversight from back when state lookup was converted to\nRCU, this lock should be replaced with RCU in a future patch."
        }
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        "dateUpdated": "2025-05-04T10:07:40.820Z",
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          "url": "https://git.kernel.org/stable/c/e952837f3ddb0ff726d5b582aa1aad9aa38d024d"
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      "title": "xfrm: state: fix out-of-bounds read during lookup",
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    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2024-57982",
    "datePublished": "2025-02-27T02:07:08.169Z",
    "dateReserved": "2025-02-27T02:04:28.913Z",
    "dateUpdated": "2025-05-04T10:07:40.820Z",
    "state": "PUBLISHED"
  },
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  }
}


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