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CVE-2023-54062

HIGHCVSS 7.8/10EPSS 0.20%

Last modified

CVE-2023-54062 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. EPSS estimates a 0.20% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
0.20%

10.4th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= c7851208abffe5ae4deb01cf48763911dc14fc67, < 76887be2a96193cd11be818551b8934ecdb3123f; >= f5cdc6a7339f250d44d4d469ed7a474ac0d6c7a7, < f30f3391d089dc91aef91d08f4b04a6c0df2b067; >= 3b28c799a1334adb5a19f42f03abe0d8cbb05938, < ba04d6af5ac440a6d5a2d35dc1d8e2cb0323550a; >= d738789ae9ec47d3458a008788f3cdc862ebf0cb, < 1a8822343e67432b658145d2760a524c884da9d4; >= a6744e14ce7045ab1a728bde9595f62fbd39f1d2, < 8beaa3cb293a8f7bacf711cf52201d59859dbc40; >= 8b6d06b3be7648b3b0f428558293ddf6e2cb94bf, < c5fa4eedddd1c8342ce533cb401c0e693e55b4e3; >= d2efaf8c870c7067b8d1779773134f3481cd8f68, < a18670395e5f28acddeca037c5e4bd2ea961b70a; >= 1e9d62d252812575ded7c620d8fc67c32ff06c16, < b2fab1807d26acd1c6115b95b5eddd697d84751b; >= 1e9d62d252812575ded7c620d8fc67c32ff06c16, < b87c7cdf2bed4928b899e1ce91ef0d147017ba45; >= 4.14.308, < 4.14.315; >= 4.19.276, < 4.19.283; >= 5.4.235, < 5.4.243; >= 5.10.173, < 5.10.180; >= 5.15.99, < 5.15.112; >= 6.1.16, < 6.1.29; >= 6.2.3, < 6.2.16
LinuxLinux6.3

References

Timeline

Published
Last Modified
Status
Deferred

Frequently Asked Questions

What is CVE-2023-54062?
In the Linux kernel, the following vulnerability has been resolved: ext4: fix invalid free tracking in ext4_xattr_move_to_block() In ext4_xattr_move_to_block(), the value of the extended attribute which we need to move to an external block may be allocated by kvmalloc() if the value is stored in an external inode. So at the end of the function the code tried to check if this was the case by testing entry->e_value_inum. However, at this point, the pointer to the xattr entry is no longer valid, because it was removed from the original location where it had been stored. So we could end up calling kvfree() on a pointer which was not allocated by kvmalloc(); or we could also potentially leak memory by not freeing the buffer when it should be freed. Fix this by storing whether it should be freed in a separate variable.
How severe is CVE-2023-54062?
CVE-2023-54062 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.20% probability of exploitation in the next 30 days.
How do I fix CVE-2023-54062?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST