# CVE-2024-36943: linux: In the Linux kernel, the following vulnerability has been resolved:  fs/proc/task_mmu: fix loss of young/dirty bits d...

CVE-2024-36943 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-36943, released May 30, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-36943
- Priority: Routine
- CVSS: 4.7 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 30, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  fs/proc/task_mmu: fix loss of young/dirty bits during pagemap scan  make_uffd_wp_pte() was previously doing:    pte = ptep_get(ptep);   ptep_modify_prot_start(ptep);   pte = pte_mkuffd_wp(pte);   ptep_modify_prot_commit(ptep, pte);  But if another thread accessed or dirtied the pte between the first 2 calls, this could lead to loss of that information.  Since ptep_modify_prot_start() gets and clears atomically, the following is the correct pattern and prevents any possible race.  Any access after the first call would see an invalid pte and cause a fault:    pte = ptep_modify_prot_start(ptep);   pte = pte_mkuffd_wp(pte);   ptep_modify_prot_commit(ptep, pte);

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.8.11-1 | [DEBIAN-CVE-2024-36943](https://patchblox.com/security/data/fix/linux/debian-cve-2024-36943.md) | May 30, 2024 |
| Linux | linux Debian 14 | 6.8.11-1 | [DEBIAN-CVE-2024-36943](https://patchblox.com/security/data/fix/linux/debian-cve-2024-36943.md) | May 30, 2024 |

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