vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write (Linux Linux)
En bref
- Source
- NVD
- EPSS
- EPSS 0.13 % · centile 3 ()
- État
- PUBLISHED
- Publiée
- Mise à jour
- Attribuée par
- Linux
- Statut NVD
- Analyzed
Description
In the Linux kernel, the following vulnerability has been resolved: vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write A KASAN null-ptr-deref was observed in vcs_notifier(): BUG: KASAN: null-ptr-deref in vcs_notifier+0x98/0x130 Read of size 2 at addr qmp_cmd_name: qmp_capabilities, arguments: {} The issue is a race condition in vcs_write(). When the console_lock is temporarily dropped (to copy data from userspace), the vc_data pointer obtained from vcs_vc() may become stale. After re-acquiring the lock, vcs_vc() is called again to re-validate the pointer. If the vc has been deallocated in the meantime, vcs_vc() returns NULL, and the while loop breaks (with written > 0). However, after the loop, vcs_scr_updated(vc) is still called with the now-NULL vc pointer, leading to a null pointer dereference in the notifier chain (vcs_notifier dereferences param->vc). Fix this by adding a NULL check for vc before calling vcs_scr_updated().
Faiblesses (CWE)
- CWE-476 — Déréférencement de pointeur nul
Références
- https://git.kernel.org/stable/c/43a6281790273c1b0a9ab76609ff0245b968f1e6
- https://git.kernel.org/stable/c/b6bbb85cf45bf0b070e741997fe0af3a772c5ad5
- https://git.kernel.org/stable/c/ff4806202749a51938236214adc0281481a57366
- https://git.kernel.org/stable/c/8232fca738011ca2ec865b46ec721d1796dc0580
- https://git.kernel.org/stable/c/73049768ad57145acd337102c5aa3c788e6642c8
- https://git.kernel.org/stable/c/7cc3dd79777f6ae4625ec37e84dd18a26dc88bde
- https://git.kernel.org/stable/c/74be188eb2dc1c99d63986167b9a67d415fe7326
- https://git.kernel.org/stable/c/09a43e81279b8da15526da09877134b8bcf618b0
- https://git.kernel.org/stable/c/a287620312dc6dcb9a093417a0e589bf30fcf38a
Scores
| Version | Score | Vecteur | Évalué par |
|---|---|---|---|
| CVSS 3.1 | MEDIUM 5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | NVD · nvd@nist.gov (Primary) |
Références européennes
- ENISA EUVD · EUVD-2026-45507
- GCVE · GCVE-0-2026-53385
Avis du CERT-FR
- CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1335 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1333 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1286 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1252 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1229 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1203 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1162 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1091 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-1064 — Multiples vulnérabilités dans le noyau Linux de SUSE · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0982 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
- CERTFR-2026-AVI-0957 — Multiples vulnérabilités dans le noyau Linux de Debian LTS · cert.ssi.gouv.fr
Configurations affectées (CPE NVD)
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.14.327 < 4.15cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 4.19.284 < 4.20cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.4.244 < 5.5cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.10.181 < 5.10.260cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 5.15.113 < 5.15.211cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.1.30 < 6.1.177cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.3.4 < 6.4cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.4.1 < 6.6.144cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.7 < 6.12.95cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.13 < 6.18.37cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 6.19 < 7.0.14cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*≥ 7.1 < 7.1.2cpe:2.3:o:linux:linux_kernel:6.4:-:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.4:rc3:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.4:rc4:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.4:rc5:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.4:rc6:*:*:*:*:*:*cpe:2.3:o:linux:linux_kernel:6.4:rc7:*:*:*:*:*:*
Produits affectés
| Produit | Versions |
|---|---|
| Linux · Linux | affected 11dddfbb7a4e62489b01074d6c04d9d1b42e4047 < 43a6281790273c1b0a9ab76609ff0245b968f1e6 ; affected e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67 < b6bbb85cf45bf0b070e741997fe0af3a772c5ad5 ; affected 3338d0b9acde770ee588eead5cac32c25e7048fc < ff4806202749a51938236214adc0281481a57366 ; affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 < 8232fca738011ca2ec865b46ec721d1796dc0580 ; affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 < 73049768ad57145acd337102c5aa3c788e6642c8 ; affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 < 7cc3dd79777f6ae4625ec37e84dd18a26dc88bde |
| Linux · Linux | affected 6.4 ; unaffected 0 < 6.4 ; unaffected 5.10.260 ≤ 5.10.* ; unaffected 5.15.211 ≤ 5.15.* ; unaffected 6.1.177 ≤ 6.1.* ; unaffected 6.6.144 ≤ 6.6.* |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |