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CVE-2025-38514 (GCVE-0-2025-38514)

Vulnerability from cvelistv5 – Published: 2025-08-16 10:55 – Updated: 2026-08-05 12:02
VLAI
Title
rxrpc: Fix oops due to non-existence of prealloc backlog struct
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix oops due to non-existence of prealloc backlog struct If an AF_RXRPC service socket is opened and bound, but calls are preallocated, then rxrpc_alloc_incoming_call() will oops because the rxrpc_backlog struct doesn't get allocated until the first preallocation is made. Fix this by returning NULL from rxrpc_alloc_incoming_call() if there is no backlog struct. This will cause the incoming call to be aborted.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < bf0ca6a1bc4fb904b598137c6718785a107e3adf (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < f7afb3ff01c42c49e8a143cdce400b95844bb506 (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < f5e72b7824d08c206ce106d30cb37c4642900ccc (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 0eef29385d715d4c7fd707b18d4a9b76c76dd5e6 (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < efc1b2b7c1a308b60df8f36bc2d7ce16d3999364 (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < d1ff5f9d2c5405681457262e23c720b08977c11f (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3 (git)
Affected: 248f219cb8bcbfbd7f132752d44afa2df7c241d1 , < 880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4 (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 5.4.296 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.189 , ≤ 5.15.* (semver)
Unaffected: 6.1.146 , ≤ 6.1.* (semver)
Unaffected: 6.6.99 , ≤ 6.6.* (semver)
Unaffected: 6.12.39 , ≤ 6.12.* (semver)
Unaffected: 6.15.7 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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              "value": "AV:N - The oops is driven entirely by a received UDP/rxrpc datagram processed in the endpoint\u0027s I/O thread (`rxrpc_encap_rcv` \u2192 `rxrpc_input_packet` \u2192 `rxrpc_new_incoming_call`), and AF_RXRPC services live on routable UDP ports such as the well-known AFS callback port 7001. Any remote host able to send a packet to that port reaches the vulnerable function.\nAC:L - A single well-formed rxrpc DATA packet (seq!=0, callNumber!=0, matching serviceId, securityIndex 0) deterministically dereferences the NULL backlog pointer \u2014 no race, memory-layout, or timing dependency in the packet path itself, and the well-known service IDs are protocol constants. The attacker can simply keep the port fed so any bind\u2192listen window (as in `afs_open_socket`) is hit, and sockets bound without listening are persistently exposed.\nPR:N - The attacker is an unauthenticated remote peer holding no credentials on the victim: `rxrpc_get_incoming_security()` accepts `RXRPC_SECURITY_NONE` with no key at all, and even for secured services the CHALLENGE is only queued after `rxrpc_alloc_incoming_call()` has already crashed. The same crash is also reachable by a plain unprivileged local user, since `rxrpc_create()`/`rxrpc_bind()` require no capability.\nUI:N - The crash happens autonomously inside the rxrpc I/O kernel thread while processing an inbound packet against an already-bound service socket. No victim action, mount, or file access is part of the attack.\nS:U - The NULL dereference and its consequences are confined to the kernel of the host running the AF_RXRPC service socket, with no crossing into a hypervisor, IOMMU, or sandbox authority.\nC:N - The faulting access is a read of `b-\u003ecall_backlog_head` at offset 4 from NULL, which is below `mmap_min_addr` and faults immediately. No kernel memory contents are returned to the attacker or leaked to userspace.\nI:N - Execution aborts on the very first load in `rxrpc_alloc_incoming_call()`, before any of the subsequent stores (`peer-\u003esrx = *peer_srx`, `conn-\u003elocal = ...`) are reached. Nothing is written or corrupted, so no overwrite or control-flow hijack primitive exists.\nA:H - The dereference oopses the rxrpc I/O kthread while it holds `read_lock_irq(\u0026local-\u003eservices_lock)` and `spin_lock(\u0026rx-\u003eincoming_lock)`, so the thread dies with IRQs disabled and both locks permanently held \u2014 all rxrpc/AFS traffic on that endpoint stops and any later bind or socket release spins forever. Under the common `panic_on_oops=1` configuration it is an immediate full system panic, repeatable with one packet."
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This will cause the incoming call to be aborted.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: rxrpc: Se corrige un error debido a la inexistencia de la estructura de registro de preasignaci\u00f3n. Si se abre y enlaza un socket de servicio AF_RXRPC, pero las llamadas est\u00e1n preasignadas, rxrpc_alloc_incoming_call() generar\u00e1 un error porque la estructura rxrpc_backlog no se asigna hasta que se realiza la primera preasignaci\u00f3n. Se soluciona este problema devolviendo NULL desde rxrpc_alloc_incoming_call() si no existe la estructura de registro de preasignaci\u00f3n. Esto provocar\u00e1 la interrupci\u00f3n de la llamada entrante.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/rxrpc/call_accept.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"bf0ca6a1bc4fb904b598137c6718785a107e3adf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"f7afb3ff01c42c49e8a143cdce400b95844bb506\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"f5e72b7824d08c206ce106d30cb37c4642900ccc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"0eef29385d715d4c7fd707b18d4a9b76c76dd5e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"efc1b2b7c1a308b60df8f36bc2d7ce16d3999364\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"d1ff5f9d2c5405681457262e23c720b08977c11f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"2c2e9ebeb036f9b1b09325ec5cfdfe0e78f357c3\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"248f219cb8bcbfbd7f132752d44afa2df7c241d1\",\"lessThan\":\"880a88f318cf1d2a0f4c0a7ff7b07e2062b434a4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/rxrpc/call_accept.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.296\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.240\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.189\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.146\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.99\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.39\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.15.7\",\"lessThanOrEqual\":\"6.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.16\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"NVD-CWE-noinfo\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.9\",\"versionEndExcluding\":\"5.4.296\",\"matchCriteriaId\":\"978443CD-00A7-403F-B4BF-211250E85717\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.240\",\"matchCriteriaId\":\"0E73A49A-F9B2-470F-91B2-6FAB6239BDB6\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.189\",\"matchCriteriaId\":\"3CE0FB9A-DBE8-48B6-BF6E-3C724A4991E3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"6.1.146\",\"matchCriteriaId\":\"D8DA1166-5C95-475E-BF65-1DF621968E96\"},{\"vulnerabl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Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T09:09:02+00:00",
      "cve": "CVE-2025-38514",
      "id": "CVE-2025-38514",
      "initial_release_date": "2025-08-16T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: rxrpc: Fix oops due to non-existence of prealloc backlog struct",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38514.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-30T01:54:20Z",
      "cve": "CVE-2025-38514",
      "id": "CVE-2025-38514",
      "initial_release_date": "2025-08-16T23:22:59Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "513",
      "product_status:known_not_affected": "99",
      "product_status:recommended": "472",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-38514",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-38514.json",
      "version": "48"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.