netfilter: nf_tables: prefer nft_chain_validate (Linux Linux)

CVE-2024-41042
HIGH 7.8

En bref

Source
NVD
EPSS
EPSS 0.32 % · centile 25 ()
État
PUBLISHED
Publiée
Mise à jour
Attribuée par
Linux
Statut NVD
Modified

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: prefer nft_chain_validate nft_chain_validate already performs loop detection because a cycle will result in a call stack overflow (ctx->level >= NFT_JUMP_STACK_SIZE). It also follows maps via ->validate callback in nft_lookup, so there appears no reason to iterate the maps again. nf_tables_check_loops() and all its helper functions can be removed. This improves ruleset load time significantly, from 23s down to 12s. This also fixes a crash bug. Old loop detection code can result in unbounded recursion: BUG: TASK stack guard page was hit at .... Oops: stack guard page: 0000 [#1] PREEMPT SMP KASAN CPU: 4 PID: 1539 Comm: nft Not tainted 6.10.0-rc5+ #1 [..] with a suitable ruleset during validation of register stores. I can't see any actual reason to attempt to check for this from nft_validate_register_store(), at this point the transaction is still in progress, so we don't have a full picture of the rule graph. For nf-next it might make sense to either remove it or make this depend on table->validate_state in case we could catch an error earlier (for improved error reporting to userspace).

Faiblesses (CWE)

Références

Scores

VersionScoreVecteurÉvalué par
CVSS 3.1HIGH 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HNVD · nvd@nist.gov (Primary)

Références européennes

Avis du CERT-FR

Configurations affectées (CPE NVD)

Produits affectés

ProduitVersions
Linux · Linuxaffected 20a69341f2d00cd042e81c82289fba8a13c05a25 < 1947e4c3346faa8ac7e343652c0fd3b3e394202f ; affected 20a69341f2d00cd042e81c82289fba8a13c05a25 < cd4348e0a50286282c314ad6d2b0740e7c812c24 ; affected 20a69341f2d00cd042e81c82289fba8a13c05a25 < 31c35f9f89ef585f1edb53e17ac73a0ca4a9712b ; affected 20a69341f2d00cd042e81c82289fba8a13c05a25 < 8246b7466c8da49d0d9e85e26cbd69dd6d3e3d1e ; affected 20a69341f2d00cd042e81c82289fba8a13c05a25 < b6b6e430470e1c3c5513311cb35a15a205595abe ; affected 20a69341f2d00cd042e81c82289fba8a13c05a25 < 717c91c6ed73e248de6a15bc53adefb81446c9d0
Linux · Linuxaffected 3.13 ; unaffected 0 < 3.13 ; unaffected 4.19.320 ≤ 4.19.* ; unaffected 5.4.282 ≤ 5.4.* ; unaffected 5.10.224 ≤ 5.10.* ; unaffected 5.15.165 ≤ 5.15.*

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