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CVE-2024-57982

Status: ModifiedHigh (7.1)—

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.

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.

Read full descriptionShow less

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.

Technical details traces, logs and code from the original report
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) {

CVSS

Exploitation probability (EPSS)

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

Vulnerabilidad de lectura fuera de límites (CWE-125) en kernel con acceso local (AV:L/PR:L) sin interacción. Permite a atacante con privilegios locales causar DoS o ejecutar código; la carrera de datos en xfrm_state_hash_generation habilita escalada o corrupción de memoria.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Execution PreventionThreat Intelligence ProgramRestrict Web-Based ContentPrivileged Account ManagementLimit Software InstallationFilter Network Traffic

Affected technologies (1)

Linux — Linux Kernel

CWEs

References

Raw JSON (NVD)

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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->xfrm.state_bydst, ndst) [..]\n  net->xfrm.state_hmask = nhashmask;\n\nWhile state lookup does:\n  h = xfrm_dst_hash(net, daddr, saddr, tmpl->reqid, encap_family);\n  hlist_for_each_entry_rcu(x, net->xfrm.state_bydst + h, bydst) {\n\nThis is only safe in case the update to state_bydst is larger than\nnet->xfrm.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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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: xfrm: state: fix out-of-limits read during lookup lookup and resize can run in parallel. El 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). Solucione esto al precargar state_hmask y los punteros asociados. El reintento de seqlock xfrm_state_hash_generation asegurará que el puntero y el hmask sean consistentes. Los ayudantes existentes, como xfrm_dst_hash(), ahora no son seguros para el lado de RCU, agregue afirmaciones lockdep para documentar que solo son seguros para el lado de inserción. xfrm_state_lookup_byaddr() usa el bloqueo giratorio en lugar de RCU. AFAICS esto es un descuido de cuando la búsqueda de estado se convirtió a RCU, este bloqueo debe reemplazarse con RCU en un parche futuro."
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