AZL-51476
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-51476.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/AZL-51476
- Upstream
- Published
- 2024-10-21T20:15:16Z
- Modified
- 2026-04-01T05:16:25Z
- Severity
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- 7.0 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- CVE-2024-50036 affecting package kernel for versions less than 6.6.57.1-1
- Details
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In the Linux kernel, the following vulnerability has been resolved:
net: do not delay dst_entries_add() in dst_release()
dst_entries_add() uses per-cpu data that might be freed at netns dismantle from ip6_route_net_exit() calling dst_entries_destroy()
Before ip6_route_net_exit() can be called, we release all the dsts associated with this netns, via calls to dst_release(), which waits an rcu grace period before calling dst_destroy()
dst_entries_add() use in dst_destroy() is racy, because dst_entries_destroy() could have been called already.
Decrementing the number of dsts must happen sooner.
Notes:
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in CONFIG_XFRM case, dst_destroy() can call dst_release_immediate(child), this might also cause UAF if the child does not have DST_NOCOUNT set. IPSEC maintainers might take a look and see how to address this.
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There is also discussion about removing this count of dst, which might happen in future kernels.
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- References