tls: fix missing memory barrier in tls_init (Linux Linux)

CVE-2024-36489
MEDIUM 5.5

En bref

Source
NVD
EPSS
EPSS 0.25 % · centile 17 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: tls: fix missing memory barrier in tls_init In tls_init(), a write memory barrier is missing, and store-store reordering may cause NULL dereference in tls_{setsockopt,getsockopt}. CPU0 CPU1 ----- ----- // In tls_init() // In tls_ctx_create() ctx = kzalloc() ctx->sk_proto = READ_ONCE(sk->sk_prot) -(1) // In update_sk_prot() WRITE_ONCE(sk->sk_prot, tls_prots) -(2) // In sock_common_setsockopt() READ_ONCE(sk->sk_prot)->setsockopt() // In tls_{setsockopt,getsockopt}() ctx->sk_proto->setsockopt() -(3) In the above scenario, when (1) and (2) are reordered, (3) can observe the NULL value of ctx->sk_proto, causing NULL dereference. To fix it, we rely on rcu_assign_pointer() which implies the release barrier semantic. By moving rcu_assign_pointer() after ctx->sk_proto is initialized, we can ensure that ctx->sk_proto are visible when changing sk->sk_prot.

Faiblesses (CWE)

  • CWE-476 — Déréférencement de pointeur nul

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1MEDIUM 5.5CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected d5bee7374b68de3c44586d46e9e61ffc97a1e886 < d72e126e9a36d3d33889829df8fc90100bb0e071 ; affected d5bee7374b68de3c44586d46e9e61ffc97a1e886 < 2c260a24cf1c4d30ea3646124f766ee46169280b ; affected d5bee7374b68de3c44586d46e9e61ffc97a1e886 < 335c8f1566d8e44c384d16b450a18554896d4e8b ; affected d5bee7374b68de3c44586d46e9e61ffc97a1e886 < ab67c2fd3d070a21914d0c31319d3858ab4e199c ; affected d5bee7374b68de3c44586d46e9e61ffc97a1e886 < ef21007a7b581c7fe64d5a10c320880a033c837b ; affected d5bee7374b68de3c44586d46e9e61ffc97a1e886 < 91e61dd7a0af660408e87372d8330ceb218be302
Linux · Linuxaffected 5.7 ; unaffected 0 < 5.7 ; unaffected 5.10.219 ≤ 5.10.* ; unaffected 5.15.161 ≤ 5.15.* ; unaffected 6.1.93 ≤ 6.1.* ; unaffected 6.6.33 ≤ 6.6.*

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD