bpf: Use RCU-safe iteration in dev_map_redirect_multi() SKB path
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.
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
- Added to Heist Feed
- Publisher date