CVE-2026-53385vc_screen: fix null-ptr-deref in vcs_notifier() during concurrent vcs_write
- 5.5MediumCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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().
Timeline
ID reserved
By Linux
- 40 days later
· 40 days later
Published
- 4 months later
· 4 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (13 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 11dddfbb7a4e62489b01074d6c04d9d1b42e4047 – < 43a6281790273c1b0a9ab76609ff0245b968f1e6
- affected e3d1adcad5b73c7ed0c7edb35ab68abcaa45cf67 – < b6bbb85cf45bf0b070e741997fe0af3a772c5ad5
- affected 3338d0b9acde770ee588eead5cac32c25e7048fc – < ff4806202749a51938236214adc0281481a57366
- affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 – < 8232fca738011ca2ec865b46ec721d1796dc0580
- affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 – < 73049768ad57145acd337102c5aa3c788e6642c8
- affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 – < 7cc3dd79777f6ae4625ec37e84dd18a26dc88bde
- affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 – < 74be188eb2dc1c99d63986167b9a67d415fe7326
- affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 – < 09a43e81279b8da15526da09877134b8bcf618b0
- affected 8fb9ea65c9d1338b0d2bb0a9122dc942cdd32357 – < a287620312dc6dcb9a093417a0e589bf30fcf38a
- affected 934de9a9b659785fed3e820bc0c813a460c71fea
- affected 0deff678157333d775af190f84696336cdcccd6d
- affected a4e3c4c65ae8510e01352c9a4347e05c035b2ce2
- affected 1de42e7653d6714a7507ba6696151a1fa028c69f
- affected 5.10.181 – < 5.10.260
- affected 5.15.113 – < 5.15.211
- affected 6.1.30 – < 6.1.177
- affected 4.14.327 – < 4.15
- affected 4.19.284 – < 4.20
- affected 5.4.244 – < 5.5
- affected 6.3.4 – < 6.4
- affected 6.4
- unaffected < 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.*
- unaffected 6.12.95 – ≤ 6.12.*
- unaffected 6.18.37 – ≤ 6.18.*
- unaffected 7.0.14 – ≤ 7.0.*
- unaffected 7.1.2 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References9
- https://git.kernel.org/stable/c/43a6281790273c1b0a9ab76609ff0245b968f1e6 (opens in a new tab)
- https://git.kernel.org/stable/c/b6bbb85cf45bf0b070e741997fe0af3a772c5ad5 (opens in a new tab)
- https://git.kernel.org/stable/c/ff4806202749a51938236214adc0281481a57366 (opens in a new tab)
- https://git.kernel.org/stable/c/8232fca738011ca2ec865b46ec721d1796dc0580 (opens in a new tab)
- https://git.kernel.org/stable/c/73049768ad57145acd337102c5aa3c788e6642c8 (opens in a new tab)
- https://git.kernel.org/stable/c/7cc3dd79777f6ae4625ec37e84dd18a26dc88bde (opens in a new tab)
- https://git.kernel.org/stable/c/74be188eb2dc1c99d63986167b9a67d415fe7326 (opens in a new tab)
- https://git.kernel.org/stable/c/09a43e81279b8da15526da09877134b8bcf618b0 (opens in a new tab)
- https://git.kernel.org/stable/c/a287620312dc6dcb9a093417a0e589bf30fcf38a (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-45507 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-53385)Record last updated .