CVE-2021-47248
In the Linux kernel, the following vulnerability has been resolved: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup().
Does this matter?
Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own.
Description
In the Linux kernel, the following vulnerability has been resolved: udp: fix race between close() and udp_abort() Kaustubh reported and diagnosed a panic in udp_lib_lookup(). The root cause is udp_abort() racing with close(). Both racing functions acquire the socket lock, but udp{v6}_destroy_sock() release it before performing destructive actions. We can't easily extend the socket lock scope to avoid the race, instead use the SOCK_DEAD flag to prevent udp_abort from doing any action when the critical race happens. Diagnosed-and-tested-by: Kaustubh Pandey <kapandey@codeaurora.org>
- CVSS 3.1
- 4.7 MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.19% probability · 9th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-362
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adPatch
- https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Patch
- https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241Patch
- https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeacPatch
- https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69ePatch
- https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640ePatch
- https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400fPatch
- https://git.kernel.org/stable/c/2f73448041bd0682d4b552cfd314ace66107f1adPatch
- https://git.kernel.org/stable/c/5a88477c1c85e4baa51e91f2d40f2166235daa56Patch
- https://git.kernel.org/stable/c/65310b0aff86980a011c7c7bfa487a333d4ca241Patch
- https://git.kernel.org/stable/c/8729ec8a2238152a4afc212a331a6cd2c61aeeacPatch
- https://git.kernel.org/stable/c/a0882f68f54f7a8b6308261acee9bd4faab5a69ePatch
- https://git.kernel.org/stable/c/a8b897c7bcd47f4147d066e22cc01d1026d7640ePatch
- https://git.kernel.org/stable/c/e3c36c773aed0fef8b1d3d555b43393ec564400fPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.