CVE-2024-43806

mediumpriority · track · 0EPSS 0.005 · 41 %ileDEEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.48% (41st) EPSS

CVSS 6.5 · medium

Is it mine?

8 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · osv · suse_csaf

EPSS · scored 2026-10-27

Rustix is a set of safe Rust bindings to POSIX-ish APIs. When using `rustix::fs::Dir` using the `linux_raw` backend, it's possible for the iterator to "get stuck" when an IO error is encountered. Combined with a memory over-allocation issue in `rustix::fs::Dir::read_more`, this can cause quick and unbounded memory explosion (gigabytes in a few seconds if used on a hot path) and eventually lead to an OOM crash of the application. The symptoms were initially discovered in https://github.com/imsnif/bandwhich/issues/284. That post has lots of details of our investigation. Full details can be read on the GHSA-c827-hfw6-qwvm repo advisory. If a program tries to access a directory with its file descriptor after the file has been unlinked (or any other action that leaves the `Dir` iterator in the stuck state), and the implementation does not break after seeing an error, it can cause a memory explosion. As an example, Linux's various virtual file systems (e.g. `/proc`, `/sys`) can contain directories that spontaneously pop in and out of existence. Attempting to iterate over them using `rustix::fs::Dir` directly or indirectly (e.g. with the `procfs` crate) can trigger this fault condition if the implementation decides to continue on errors. An attacker knowledgeable about the implementation details of a vulnerable target can therefore try to trigger this fault condition via any one or a combination of several available APIs. If successful, the application host will quickly run out of memory, after which the application will likely be terminated by an OOM killer, leading to denial of service. This issue has been addressed in release versions 0.35.15, 0.36.16, 0.37.25, and 0.38.19. Users are advised to upgrade. There are no known workarounds for this issue.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedgdk-pixbuf-loader-rsvg-0:2.60.2-160000.1.1.aarch64 as component of SUSE Linux Micro 6.2suse_csaf
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Fixedtypelib-1_0-Rsvg-2_0-0:2.60.2-160000.1.1.s390x as component of SUSE Linux Enterprise Server for SAP applications 16.0suse_csaf
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
Fixedtypelib-1_0-Rsvg-2_0-0:2.60.2-160000.1.1.x86_64 as component of SUSE Linux Enterprise Server 16.0suse_csaf
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cvss

Technical severity, 0–10. One row per scoring source.

6.5

010

base score 0–10 · higher = more severe · hover a vector to decode

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · security-advisories@github.comexploitability 2.8 · impact 3.6

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · OSV

v3.16mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

v3.16.5mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:Hsecondary · SUSE Product Security

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: poc · Automatable: no · Technical Impact: partialcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-400USCWE-400US

affected products (8)

Products and version ranges known to be affected.

bytecodealliance rustix0.35.11, → 0.35.15enisa_euvdEU
bytecodealliance rustix0.36.0, → 0.36.16enisa_euvdEU
bytecodealliance rustix0.37.0, → 0.37.25enisa_euvdEU
bytecodealliance rustix0.38.0, → 0.38.19enisa_euvdEU
crates.io rustix0.35.11 → 0.35.15osvUSpkg:cargo/rustix
crates.io rustix0.36.0 → 0.36.16osvUSpkg:cargo/rustix
crates.io rustix0.37.0 → 0.37.25osvUSpkg:cargo/rustix
crates.io rustix0.38.0 → 0.38.19osvUSpkg:cargo/rustix

advisories (4)

Vendor and ecosystem advisories describing this.

SUSE-SU-2026:20755-1Security update for librsvg2026-03-19csaf · suse_csafDE
Security update for librsvg
SUSE-SU-2026:20910-1Security update for librsvg2026-03-19csaf · suse_csafDE
Security update for librsvg
openSUSE-SU-2026:20396-1Security update for librsvg2026-03-19csaf · suse_csafDE
Security update for librsvg
GHSA-c827-hfw6-qwvmrustix's `rustix::fs::Dir` iterator with the `linux_raw` backend can cause memory explosion2023-10-18ghsa · osvUS
### Summary When using `rustix::fs::Dir` using the `linux_raw` backend, it's possible for the iterator to "get stuck" when an IO error is encountered. Combined with a memory over-allocation issue in `rustix::fs::Dir::read_more`, this can cause quick and unbounded memory explosion (gigabytes in a few seconds if used on a hot path) and eventually lead to an OOM crash of the application. ### Details #### Discovery The symptoms were initially discovered in https://github.com/imsnif/bandwhich/issues/284. That post has lots of details of our investigation. See [this post](https://github.com/imsnif/bandwhich/issues/284#issuecomment-1754321993) and the [Discord thread](https://discord.com/channels/273534239310479360/1161137828395237556) for details. #### Diagnosis This issue is caused by the combination of two independent bugs: 1. Stuck iterator - The `rustix::fs::Dir` iterator can fail to halt after encountering an IO error, causing the caller to be stuck in an infinite loop. 2. Memory over-allocation - `Dir::read_more` incorrectly grows the read buffer unconditionally each time it is called, regardless of necessity. Since `<Dir as Iterator>::next` calls `Dir::read`, which in turn calls `Dir::read_more`, this means an IO error encountered during reading a directory can lead to rapid and unbounded growth of memory use. ### PoC ```rust fn main() -> Result<(), Box<dyn std::error::Error>> { // create a directory, get a FD to it, then unlink the directory but keep the FD std::fs::create_dir("tmp_dir")?; let dir_fd = rustix::fs::openat( rustix::fs::CWD, rustix::cstr!("tmp_dir"), rustix::fs::OFlags::RDONLY | rustix::fs::OFlags::CLOEXEC, rustix::fs::Mode::empty(), )?; std::fs::remove_dir("tmp_dir")?; // iterator gets stuck in infinite loop and memory explodes rustix::fs::Dir::read_from(dir_fd)? // the iterator keeps returning `Some(Err(_))`, but never halts by returning `None` // therefore if the implementation ignores the error (or otherwise continues // after seeing the error instead of breaking), the loop will not halt .filter_map(|dirent_maybe_error| dirent_maybe_error.ok()) .for_each(|dirent| { // your happy path println!("{dirent:?}"); }); Ok(()) } ``` ### Impact If a program tries to access a directory with its file descriptor after the file has been unlinked (or any other action that leaves the `Dir` iterator in the stuck state), and the implementation does not break after seeing an error, it can cause a memory explosion. As an example, Linux's various virtual file systems (e.g. `/proc`, `/sys`) can contain directories that spontaneously pop in and out of existence. Attempting to iterate over them using `rustix::fs::Dir` directly or indirectly (e.g. with the `procfs` crate) can trigger this fault condition if the implementation decides to continue on errors. An attacker knowledgeable about the implementation details of a vulnerable target can therefore try to trigger this fault condition via any one or a combination of several available APIs. If successful, the application host will quickly run out of memory, after which the application will likely be terminated by an OOM killer, leading to denial of service.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd osv suse_csaf NVD CVE.org MITRE

published 2024-08-26modified 2026-06-17

references (8)

External citations — patches, advisories, analysis.

scry

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