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CVE-2024-26720

Status Candidate

Overview

In the Linux kernel, the following vulnerability has been resolved: mm/writeback: fix possible divide-by-zero in wb_dirty_limits(), again (struct dirty_throttle_control *)->thresh is an unsigned long, but is passed as the u32 divisor argument to div_u64(). On architectures where unsigned long is 64 bytes, the argument will be implicitly truncated. Use div64_u64() instead of div_u64() so that the value used in the "is this a safe division" check is the same as the divisor. Also, remove redundant cast of the numerator to u64, as that should happen implicitly. This would be difficult to exploit in memcg domain, given the ratio-based arithmetic domain_drity_limits() uses, but is much easier in global writeback domain with a BDI_CAP_STRICTLIMIT-backing device, using e.g. vm.dirty_bytes=(1<<32)*PAGE_SIZE so that dtc->thresh == (1<<32)

Related Files

Ubuntu Security Notice USN-6866-3
Posted Jul 11, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6866-3 - It was discovered that the ext4 file system implementation in the Linux kernel did not properly validate data state on write operations. An attacker could use this to construct a malicious ext4 file system image that, when mounted, could cause a denial of service. It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2021-33631, CVE-2021-47063, CVE-2022-0001, CVE-2023-6270, CVE-2024-2201, CVE-2024-23307, CVE-2024-24861, CVE-2024-26720, CVE-2024-26898
SHA-256 | cd531bd98e8b9bc6399b28fcdad6313e6b25ed3910dd56bf9af73db0843fc2b2
Ubuntu Security Notice USN-6866-2
Posted Jul 5, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6866-2 - It was discovered that the ext4 file system implementation in the Linux kernel did not properly validate data state on write operations. An attacker could use this to construct a malicious ext4 file system image that, when mounted, could cause a denial of service. It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2021-33631, CVE-2021-47063, CVE-2022-0001, CVE-2023-6270, CVE-2024-2201, CVE-2024-23307, CVE-2024-24861, CVE-2024-26720, CVE-2024-26898
SHA-256 | c2451c35c4f65c3753b0fcc6bbcbc31cf6e73e7ae847a31805b297f8c452e962
Ubuntu Security Notice USN-6866-1
Posted Jul 4, 2024
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6866-1 - It was discovered that the ext4 file system implementation in the Linux kernel did not properly validate data state on write operations. An attacker could use this to construct a malicious ext4 file system image that, when mounted, could cause a denial of service. It was discovered that the ATA over Ethernet driver in the Linux kernel contained a race condition, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code.

tags | advisory, denial of service, arbitrary, kernel
systems | linux, ubuntu
advisories | CVE-2021-33631, CVE-2021-47063, CVE-2022-0001, CVE-2023-6270, CVE-2024-2201, CVE-2024-23307, CVE-2024-24861, CVE-2024-26720, CVE-2024-26898
SHA-256 | a65af3943392f41a1f25fbd47f49e95bd580bdcb4dd7f0b1758fd82d6b6b6921
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