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bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path The DEVMAP_HASH branch in dev_map_redirect_multi() uses hlist_for_each_entry_safe() to iterate hash buckets, but this function runs under RCU protection (called from xdp_do_generic_redirect_map() in softirq context). Concurrent writers (__dev_map_hash_update_elem, dev_map_hash_delete_elem) modify the list using RCU primitives (hlist_add_head_rcu, hlist_del_rcu). hlist_for_each_entry_safe() performs plain pointer dereferences without rcu_dereference(), missing the acquire barrier needed to pair with writers' rcu_assign_pointer(). On weakly-ordered architectures (ARM64, POWER), a reader can observe a partially-constructed node. It also defeats CONFIG_PROVE_RCU lockdep validation and KCSAN data-race detection. Replace with hlist_for_each_entry_rcu() using rcu_read_lock_bh_held() as the lockdep condition, consistent with the rcu_dereference_check() used in the DEVMAP (non-hash) branch of the same functions. Also fix the same incorrect lockdep_is_held(&dtab->index_lock) condition in dev_map_enqueue_multi(), where the lock is not held either.

Announced Source revision 1
Original source ↗

CVE-2026-53096

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-53096

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "4a3d0fe30b907ff324b1b49756f7e713d67f3645",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "b089aa6e94d7a08e74d076a0fe274842dc9feccc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "571a05ea1baaccc0dc1e0d227b2cbc978b96d392",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "cb2c1f3cf65b855548e1b8d55a08bfbaa5a0901a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "d4c4bd231ebad70e6f30db429e9640bf378b2f52",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "7027e705062482a8cea43a1c13ede3c35653966f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "e624d4ed4aa8cc3c69d1359b0aaea539203ed266",
        "lessThan": "8ed82f807bb09d2c8455aaa665f2c6cb17bc6a19",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/bpf/devmap.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.14"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.14",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.209",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.175",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.141",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.91",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.33",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.0.10",
        "versionType": "semver",
        "lessThanOrEqual": "7.0.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/bpf/devmap.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-53096

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#40753 · Revision 1
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Publisher date
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